--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cs/drivers/drv_app/uart/uartfax_dp.c	Sun Jul 15 04:39:26 2018 +0000
@@ -0,0 +1,4204 @@
+/*******************************************************************************
+ *
+ * UARTFAX.C
+ *
+ * This driver allows to control the UARTs of chipset 1.5 for fax and data
+ * services. It performs flow control: RTS/CTS, XON/XOFF.
+ *
+ * (C) Texas Instruments 1999
+ *
+ ******************************************************************************/
+
+/*
+ *      DB9     16750
+ *
+ * 1    DCD     DTR     output
+ * 2    RX      SOUT    output
+ * 3    TX      SIN     input
+ * 4    DTR     DSR     input
+ * 5    GND
+ * 6    DSR (connected to DTR (DB9) if J1 is used)
+ * 7    RTS     CTS     input
+ * 8    CTS     RTS     output
+ * 9    nc
+ */
+#include <string.h>
+#include "nucleus.h"
+
+#include "config/chipset.cfg"
+#include "config/board.cfg"
+
+#include "main/sys_types.h"
+#include "uart/faxdata.h"
+#include "uart/uartfax.h"
+#include "memif/mem.h"
+
+
+short uart_initialized = 0;
+
+
+/* 
+ * Maximal value for an unsigned 32 bits.
+ */
+
+#define MAX_UNSIGNED_32 (4294967295)
+
+#define FIFO_SIZE (64) /* In bytes. */
+
+
+/*
+ * TLR is used to program the RX FIFO trigger levels. FCR[7:4] are  not used.
+ * No trigger level used for TX FIFO. THR_IT generated on TX FIFO empty.
+ */
+ 
+#define RX_FIFO_TRIGGER_LEVEL (12 << 4)
+
+
+/*
+ * 16750 addresses. Registers accessed when LCR[7] = 0.
+ */
+
+#define RHR (0x00) /* Rx buffer register - Read access   */
+#define THR (0x00) /* Tx holding register - Write access */
+#define IER (0x01) /* Interrupt enable register          */
+
+/*
+ * 16750 addresses. Registers accessed when LCR[7] = 1.
+ */
+
+#define DLL (0x00) /* Divisor latch (LSB) */
+#define DLM (0x01) /* Divisor latch (MSB) */
+
+
+/*
+ * EFR is accessed when LCR[7:0] = 0xBF.
+ */
+
+#define EFR (0x02) /* Enhanced feature register */
+
+
+/*
+ * 16750 addresses. Bit 5 of the FCR register is accessed when LCR[7] = 1.
+ */
+
+#define IIR (0x02)  /* Interrupt ident. register - Read only */
+#define FCR (0x02)  /* FIFO control register - Write only    */
+#define LCR (0x03)  /* Line control register                 */
+#define MCR (0x04)  /* Modem control register                */
+#define LSR (0x05)  /* Line status register                  */
+#define MSR (0x06)  /* Modem status register                 */
+#define TCR  (0x06) /* Transmission control register         */
+#define TLR  (0x07) /* Trigger level register                */
+#define MDR1 (0x08) /* Mode definition register 1            */
+#define SCR  (0x10) /* Supplementary Control register        */
+#define SSR  (0x11) /* Supplementary Status register         */
+
+
+/*
+ * Supplementary control register.
+ */
+
+#define TX_EMPTY_CTL_IT (0x08)
+#define RX_CTS_WAKE_UP_ENABLE_BIT (4) /* Use RESET_BIT and SET_BIT macros. */
+
+/*
+ * Enhanced feature register.
+ */
+ 
+#define ENHANCED_FEATURE_BIT (4) /* Use RESET_BIT and SET_BIT macros. */
+
+/*
+ * Mode definition register 1.
+ */
+
+#define UART_MODE             (0x00)
+#define SIR_MODE              (0x01)
+#define UART_MODE_AUTOBAUDING (0x02) /* Reserved in UART/IrDA. */
+#define RESET_DEFAULT_STATE   (0x07)
+#define IR_SLEEP_DISABLED     (0x00)
+#define IR_SLEEP_ENABLED      (0x08)
+#define SIR_TX_WITHOUT_ACREG2 (0x00) /* Reserved in UART/modem. */
+#define SIR_TX_WITH_ACREG2    (0x20) /* Reserved in UART/modem. */
+#define FRAME_LENGTH_METHOD   (0x00) /* Reserved in UART/modem. */
+#define EOT_BIT_METHOD        (0x80) /* Reserved in UART/modem. */
+
+/*
+ * Supplementary Status Register
+ */
+
+#define TX_FIFO_FULL (0x01)
+
+
+/*
+ * Interrupt enable register.
+ */
+
+#define ERBI  (0x01) /* Enable received data available interrupt            */
+#define ETBEI (0x02) /* Enable transmitter holding register empty interrupt */
+#define ELSI  (0x04) /* Enable receiver line status interrupt               */
+#define EDSSI (0x08) /* Enable modem status interrupt                       */
+#define IER_SLEEP (0x00)  /* Enable sleep mode                              */
+
+/*
+ * Modem control register.
+ */
+
+#define MDTR (0x01) /* Data terminal ready. */
+#define MRTS (0x02) /* Request to send.     */
+#define TCR_TLR_BIT (6)
+
+/*
+ * Line status register.
+ */
+
+#define DR   (0x01) /* Data ready                                  */
+#define OE   (0x02) /* Overrun error                               */
+#define PE   (0x04) /* Parity error                                */
+#define FE   (0x08) /* Framing error                               */
+#define BI   (0x10) /* Break interrupt                             */
+#define THRE (0x20) /* Transmitter holding register (FIFO empty)   */
+#define TEMT (0x40) /* Transmitter empty (FIFO and TSR both empty) */
+
+#define BYTE_ERROR (OE | PE | FE | BI)
+
+/*
+ * Interrupt identification register.
+ * Bit 0 is set to 0 if an IT is pending.
+ * Bits 1 and 2 are used to identify the IT.
+ */
+
+#define IIR_BITS_USED    (0x07)
+#define IT_PENDING       (0x01)
+#define RX_DATA          (0x04)
+#define TX_EMPTY         (0x02)
+#define MODEM_STATUS     (0x00)
+
+/*
+ * Modem status register.
+ */
+
+#define DELTA_CTS (0x01)
+#define DELTA_DSR (0x02)
+#define MCTS      (0x10) /* Clear to send       */
+#define MDSR      (0x20) /* Data set ready      */
+
+/*
+ * Line control register.
+ */
+
+#define WLS_5         (0x00) /* Word length: 5 bits                    */
+#define WLS_6         (0x01) /* Word length: 6 bits                    */
+#define WLS_7         (0x02) /* Word length: 7 bits                    */
+#define WLS_8         (0x03) /* Word length: 8 bits                    */
+#define STB           (0x04) /* Number of stop bits: 0: 1, 1: 1,5 or 2 */
+#define PEN           (0x08) /* Parity enable                          */
+#define EPS           (0x10) /* Even parity select                     */
+#define BREAK_CONTROL (0x40) /* Enable a break condition               */
+#define DLAB          (0x80) /* Divisor latch access bit               */
+
+/*
+ * FIFO control register.
+ */
+
+#define FIFO_ENABLE   (0x01)
+#define RX_FIFO_RESET (0x02)
+#define TX_FIFO_RESET (0x04)
+
+/*
+ * These constants define the states of the escape sequence detection.
+ */
+
+#define INITIALIZATION       (0)
+#define NO_ESCAPE_SEQUENCE   (1)
+#define ONE_CHAR_DETECTED    (2)
+#define TWO_CHARS_DETECTED   (3)
+#define THREE_CHARS_DETECTED (4)
+
+#define CHARACTERS_IN_ESC_SEQ        (3)
+#define DEFAULT_ESC_SEQ_CHARACTER    '+'
+#define DEFAULT_GUARD_PERIOD      (1000) /* 1 second. */
+
+/*
+ * 3 HISR are used to avoid to execute operations from the LISR.
+ */
+ 
+#define RX_HISR_PRIORITY      (2)
+#define RX_HISR_STACK_SIZE  (512) /* Bytes. */ 
+#define TX_HISR_PRIORITY      (2)
+#define TX_HISR_STACK_SIZE  (512) /* Bytes. */ 
+#define V24_HISR_PRIORITY     (2)
+#define V24_HISR_STACK_SIZE (512) /* Bytes. */ 
+
+/*
+ * When the break interrupt indicator (BI) is set in the line status register
+ * (LSR), it indicates that the received data input was held in the low state
+ * for longer than a full-word transmission time. In the FIFO mode, when a break
+ * occurs, only one 0 character is loaded into the FIFO. The next character
+ * transfer is enabled after SIN goes to the marking state for at least two RCLK
+ * samples and then receives the next valid start bit.
+ * This constant defined a defined break length returned by the US_GetLineState
+ * function.
+ */
+
+#define MINIMAL_BREAK_LENGTH (2)
+
+#define BREAK_HISR_PRIORITY     (2)
+#define BREAK_HISR_STACK_SIZE (512) /* Bytes. */
+
+/*
+ * These macros allow to read and write a UART register.
+ */
+
+#define READ_UART_REGISTER(UART,REG)                                  \
+            *((volatile SYS_UWORD8 *) ((UART)->base_address + (REG)))
+
+#define WRITE_UART_REGISTER(UART,REG,VALUE)                                     \
+            *((volatile SYS_UWORD8 *) ((UART)->base_address + (REG))) = (VALUE)
+
+#define RESET_BIT(UART,REG,BIT)    \
+			(WRITE_UART_REGISTER ( \
+			     UART, REG, READ_UART_REGISTER (UART, REG) & ~(1 << (BIT))))
+
+#define SET_BIT(UART,REG,BIT)      \
+			(WRITE_UART_REGISTER ( \
+			     UART, REG, READ_UART_REGISTER (UART, REG) | (1 << (BIT))))
+
+
+/*
+ * These macros allow to enable or disable the wake-up interrupt.
+ */
+
+#define ENABLE_WAKEUP_INTERRUPT(UART)   \
+	SET_BIT(UART, SCR, RX_CTS_WAKE_UP_ENABLE_BIT);
+
+#define DISABLE_WAKEUP_INTERRUPT(UART)   \
+	RESET_BIT(UART, SCR, RX_CTS_WAKE_UP_ENABLE_BIT);
+
+
+/*
+ * This macro is used to simplify the code in detect_escape_sequence.
+ */
+
+#define CHECK_RX_FIFO_OUT_WRAP_AROUND(UART)                                   \
+        {                                                                     \
+            if (rx_fifo_out ==                                                \
+                &((UART)->rx_fifo_byte[0]) + (UART)->rx_fifo_buffer_size + 1) \
+                rx_fifo_out = &((UART)->rx_fifo_byte[0]);                     \
+        }
+        
+/*
+ * This macro is created to simplify the code. It allows to write a byte from
+ * the TX buffer to the TX FIFO.
+ * The tx_out pointer is incremented before to write the character into the
+ * TX FIFO because an interrupt may occur between the two operations.
+ */
+
+#define WRITE_ONE_TX_BUFFER_BYTE_IN_TX_FIFO(UART)                      \
+        {                                                              \
+            SYS_UWORD8 buffer_byte;                                    \
+                                                                       \
+            if (get_bytes_in_tx_buffer (UART)) {                       \
+                                                                       \
+                buffer_byte = *((UART)->tx_out++);                     \
+                WRITE_UART_REGISTER (UART, THR, buffer_byte);          \
+                                                                       \
+                if ((UART)->tx_out ==                                  \
+                    &((UART)->tx_buffer[0]) + (UART)->buffer_size + 1) \
+                                                                       \
+                    (UART)->tx_out = &((UART)->tx_buffer[0]);          \
+            }                                                          \
+        }
+
+/*
+ * The transmitter is disabled only when the application disables the driver.
+ * To disable the driver, the receiver and the transmitter are disabled by the
+ * application. The transmitter is disabled first to test if the driver is
+ * disabled.
+ */
+
+#define DRIVER_DISABLED(UART) ((UART)->tx_stopped_by_application)
+
+#define DISABLE_DRIVER(UART)                       \
+        {                                          \
+            (UART)->tx_stopped_by_application = 1; \
+            (UART)->rx_stopped_by_application = 1; \
+        }
+
+#define ENABLE_DRIVER(UART)                        \
+        {                                          \
+            (UART)->rx_stopped_by_application = 0; \
+            (UART)->tx_stopped_by_application = 0; \
+        }
+
+/*
+ * Low and high watermarks for the RX buffer. If it is enabled, the flow
+ * control is activated or deactivated according to these values.
+ * The high watermark value allows to copy an array filled with the RX FIFO
+ * into the RX buffer. 
+ */
+
+#define RX_LOW_WATERMARK(RX_BUFFER_SIZE)  (FIFO_SIZE)
+#define RX_HIGH_WATERMARK(RX_BUFFER_SIZE) ((RX_BUFFER_SIZE) - 2 * FIFO_SIZE)
+
+/* 
+ * This macro allows to know if the RX buffer is full. It must be called only
+ * from the RX HISR. If it is called from the application, the rx_in and 
+ * rx_fifo_in pointers may be updated if a RX interrupt occurs or if the 
+ * RX HISR is activated.
+ */
+
+#define RX_BUFFER_FULL(UART)                                          \
+            (((UART)->rx_in == (UART)->rx_out - 1) ||                 \
+             ((UART)->rx_in == (UART)->rx_out + (UART)->buffer_size))
+
+/*
+ * This macro allows to know if the TX buffer is empty.
+ */
+
+#define TX_BUFFER_EMPTY(UART)                                         \
+            ((UART)->tx_in == (UART)->tx_out)
+
+/*
+ * This macro is used to convert a time (unit: ms) into a number of TDMA.
+ * 1 TDMA = 4.6 ms (23/5).
+ */
+
+#define CONVERT_TIME_IN_TDMA(TIME) (((TIME) * 5) / 23)
+
+/*
+ * Size of the intermediate circular buffer used to store RX FIFO bytes before
+ * to analyze them from the RX HISR.
+ */
+ 
+#define RX_FIFO_BUFFER_SIZE (2 * FIFO_SIZE) 
+ 
+
+ 
+typedef void (*T_HISR_ENTRY)(void);
+typedef void (*T_TIMER_FUNCTION)(UNSIGNED);
+
+static void hisr_execute_rx_entry_point_1(void);
+static void hisr_execute_rx_entry_point_2(void);
+static void hisr_execute_tx_entry_point_1(void);
+static void hisr_execute_tx_entry_point_2(void);
+static void hisr_execute_v24_entry_point_1(void);
+static void hisr_execute_v24_entry_point_2(void);
+static void hisr_start_break_entry_point_1(void);
+static void hisr_start_break_entry_point_2(void);
+static void stop_break_entry_point_1(UNSIGNED);
+static void stop_break_entry_point_2(UNSIGNED);
+static void analyze_guard_period_timer_expiration_entry_1(UNSIGNED);
+static void analyze_guard_period_timer_expiration_entry_2(UNSIGNED);
+
+
+const T_TIMER_FUNCTION analyze_guard_period_timer_expiration_tab[NUMBER_OF_FD_UART] =
+{
+    analyze_guard_period_timer_expiration_entry_1,
+    analyze_guard_period_timer_expiration_entry_2
+};
+
+const T_TIMER_FUNCTION stop_break_tab[NUMBER_OF_FD_UART] =
+{
+    stop_break_entry_point_1,
+    stop_break_entry_point_2
+};
+
+const T_HISR_ENTRY hisr_execute_rx_tab[NUMBER_OF_FD_UART] =
+{
+    hisr_execute_rx_entry_point_1,
+    hisr_execute_rx_entry_point_2
+};
+
+const T_HISR_ENTRY hisr_execute_tx_tab[NUMBER_OF_FD_UART] =
+{
+    hisr_execute_tx_entry_point_1,
+    hisr_execute_tx_entry_point_2
+};
+
+const T_HISR_ENTRY hisr_execute_v24_tab[NUMBER_OF_FD_UART] =
+{
+    hisr_execute_v24_entry_point_1,
+    hisr_execute_v24_entry_point_2
+};
+
+const T_HISR_ENTRY hisr_start_break_tab[NUMBER_OF_FD_UART] =
+{
+    hisr_start_break_entry_point_1,
+    hisr_start_break_entry_point_2
+}; 
+
+
+
+/*
+ * This structure describes an UART compatible with the UART 16750 and
+ * contains some fields to manage this UART.
+ */
+
+typedef struct s_uart {
+
+    SYS_UWORD32 base_address;
+
+    /*
+     * HISR executed from the RX/TX interrupt handler.
+     */
+     
+    NU_HISR rx_hisr_ctrl_block;
+    NU_HISR tx_hisr_ctrl_block;
+    NU_HISR v24_hisr_ctrl_block;
+    char    rx_hisr_stack[RX_HISR_STACK_SIZE];
+    char    tx_hisr_stack[TX_HISR_STACK_SIZE];
+    char    v24_hisr_stack[V24_HISR_STACK_SIZE];
+    
+    /*
+     * 2 arrays are used to store bytes read in RX FIFO. A UART RX interrupt
+     * may occur while executing RX operations in RX HISR. To avoid overwriting
+     * the array in which received bytes are stored, a second array is used.
+     */
+     
+    SYS_UWORD8  *rx_buffer_used_by_rx_lisr;
+    SYS_UWORD8  *rx_buffer_used_by_rx_hisr;
+    SYS_UWORD8  rx_fifo_byte_1[FIFO_SIZE];
+    SYS_UWORD8  rx_fifo_byte_2[FIFO_SIZE];
+    SYS_UWORD16 bytes_in_rx_buffer_1;
+    SYS_UWORD16 bytes_in_rx_buffer_2;
+    
+    /*
+     * RX and TX buffers.
+     * One character is not used in each buffer to allow to know if the buffer
+     * is empty or not (See macro RX_BUFFER_FULL). If buffers are empty,
+     * rx_in = rx_out and tx_in = tx_out. It is impossible to use fields to
+     * count the number of bytes in each buffer because these fields may be
+     * updated from the application and from the interrupt handlers. That avoids
+     * to have conflicts.
+     */
+
+    SYS_UWORD16 buffer_size;
+    SYS_UWORD16 rx_threshold_level;
+    SYS_UWORD16 tx_threshold_level;
+    SYS_UWORD8  rx_buffer[FD_MAX_BUFFER_SIZE + 1];
+    SYS_UWORD8  tx_buffer[FD_MAX_BUFFER_SIZE + 1];
+    SYS_UWORD8  *rx_in;
+    SYS_UWORD8  *rx_out;
+    SYS_UWORD8  *tx_in;
+    SYS_UWORD8  *tx_out;
+
+    /*
+     * Escape sequence.
+     * the field esc_seq_modified may have 2 values:
+     *      - 0: No modification.
+     *      - 1: Parameters are in the process of modification: The detection
+     *           is stopped.
+     */
+
+    NU_TIMER guard_period_timer_ctrl_block;
+    SYS_UWORD8    esc_seq_modified;
+    SYS_UWORD8    esc_seq_detection_state;
+    SYS_UWORD8    esc_seq_character;
+    UNSIGNED guard_period;
+    UNSIGNED current_time;
+    UNSIGNED previous_time;
+
+    /*
+     * Flow control.
+     */
+
+    T_flowCtrlMode flow_control_mode;
+    SYS_BOOL           send_xon_xoff;
+    SYS_UWORD8          xon_xoff_to_send;
+    SYS_UWORD8          xon_character;
+    SYS_UWORD8          xoff_character;
+    SYS_BOOL           rx_stopped_by_application;
+    SYS_BOOL           rx_stopped_by_driver;
+    SYS_BOOL           tx_stopped_by_application;
+    SYS_BOOL           tx_stopped_by_driver;
+
+    /*
+     * Break.
+     */
+
+    SYS_BOOL     break_received;
+    SYS_BOOL     break_to_send;
+    SYS_BOOL     break_in_progress;
+    NU_HISR  break_hisr_ctrl_block;
+    char     break_hisr_stack[BREAK_HISR_STACK_SIZE];
+    NU_TIMER break_timer_ctrl_block;
+    UNSIGNED baudrate;
+    UNSIGNED bits_per_char; /* Including start, stop and parity bits. */
+    UNSIGNED break_length;  /* In bytes. */
+    UNSIGNED time_without_character;
+
+    /*
+     * Callback (UAF_ReadData and UAF_WriteData).
+     * rd: read, wr: write.
+     */
+
+    SYS_UWORD8 cts_level; /* 1: The RS232 line is deactivated (low). */
+    SYS_BOOL  esc_seq_received;
+    
+    SYS_BOOL         reading_suspended;
+    SYS_BOOL         writing_suspended;
+    SYS_BOOL         rd_call_from_hisr_in_progress;
+    SYS_BOOL         wr_call_from_hisr_in_progress;
+    T_reInstMode rd_call_setup;
+    T_reInstMode wr_call_setup;
+    SYS_UWORD8        *rd_address[2];
+    SYS_UWORD8        *wr_address[2];
+    SYS_UWORD16       rd_size_before_call[2];
+    SYS_UWORD16       rd_size_after_call[2];
+    SYS_UWORD16       wr_size_before_call[2];
+    SYS_UWORD16       wr_size_after_call[2];
+
+    void (*readOutFunc) (SYS_BOOL cldFromIrq,
+                         T_reInstMode *reInstall,
+                         SYS_UWORD8 nsource,
+                         SYS_UWORD8 *source[],
+                         SYS_UWORD16 size[],
+                         SYS_UWORD32 state);
+
+    void (*writeInFunc) (SYS_BOOL cldFromIrq,
+                         T_reInstMode *reInstall,
+                         SYS_UWORD8 ndest,
+                         SYS_UWORD8 *dest[],
+                         SYS_UWORD16 size[]);
+
+    /*
+     * These fields are used to store the state defined in UAF_GetLineState.The
+     * first field is used when UAF_GetLineState and UAF_ReadData are not called.
+     * When one of these functions is called the second field is used. That
+     * avoids to lose events when UAF_GetLineState or UAF_ReadData resets the
+     * first field.
+     */
+
+    SYS_UWORD32 state_1;
+    SYS_UWORD32 state_2;
+    SYS_UWORD32 *state;
+
+    /*
+     * Errors counters.
+     */
+
+    SYS_UWORD32 framing_error;
+    SYS_UWORD32 parity_error;
+    SYS_UWORD32 overrun_error;
+    SYS_UWORD32 spurious_interrupts;
+
+    SYS_UWORD16 max_rx_fifo_level;
+
+} t_uart;
+
+static t_uart uart_parameters[NUMBER_OF_FD_UART];
+
+static const SYS_UWORD32 base_address[NUMBER_OF_FD_UART] =
+{
+    MEM_UART_IRDA,
+    MEM_UART_MODEM
+};
+
+
+/*
+ * DLL (LSB) and DLH (MSB) registers values using the 13 MHz clock.
+ */
+
+static const SYS_UWORD8 dll[] =
+{
+      0, /*   Auto baud: not supported. */
+     81, /*     75 baud.                */
+     40, /*    150 baud.                */
+    148, /*    300 baud.                */
+     74, /*    600 baud.                */
+    165, /*   1200 baud.                */
+     83, /*   2400 baud.                */
+    169, /*   4800 baud.                */
+    113, /*   7200 baud.                */
+     84, /*   9600 baud.                */
+     56, /*  14400 baud.                */
+     42, /*  19200 baud.                */
+     28, /*  28800 baud.                */
+     24, /*  33900 baud: not supported. */
+     21, /*  38400 baud.                */
+     14, /*  57600 baud.                */
+      7, /* 115200 baud.                */
+      0, /* 203125 baud: not supported. */
+      0, /* 406250 baud: not supported. */
+      0  /* 812500 baud: not supported. */
+};
+
+static const SYS_UWORD8 dlh[] = 
+{
+    0, /*   Auto baud: not supported. */
+   42, /*     75 baud.                */
+   21, /*    150 baud.                */
+   10, /*    300 baud.                */
+    5, /*    600 baud.                */
+    2, /*   1200 baud.                */
+    1, /*   2400 baud.                */
+    0, /*   4800 baud.                */
+    0, /*   7200 baud.                */
+    0, /*   9600 baud.                */
+    0, /*  14400 baud.                */
+    0, /*  19200 baud.                */
+    0, /*  28800 baud.                */
+    0, /*  33900 baud: not supported. */
+    0, /*  38400 baud.                */
+    0, /*  57600 baud.                */
+    0, /* 115200 baud.                */
+    0, /* 203125 baud: not supported. */
+    0, /* 406250 baud: not supported. */
+    0  /* 812500 baud: not supported. */
+};
+
+static const UNSIGNED baudrate_value[] =
+{
+         0, /* Not supported. */
+        75,
+       150,
+       300,
+       600,
+      1200,
+      2400,
+      4800,
+      7200,
+      9600,
+     14400,
+     19200,
+     28800,
+         0, /* Not supported. */
+     38400,
+     57600,
+    115200,
+         0, /* Not supported. */
+         0, /* Not supported. */
+         0  /* Not supported. */
+};
+
+/*******************************************************************************
+ *
+ *                          get_bytes_in_rx_buffer
+ * 
+ * Purpose  : Gets the number of bytes in the RX buffer.
+ *
+ * Arguments: In : uart: Pointer on the UART structure.
+ *            Out: none
+ *
+ * Returns  : The number of bytes in the RX buffer.
+ *
+ ******************************************************************************/
+
+static SYS_UWORD16
+get_bytes_in_rx_buffer (t_uart *uart)
+{
+    SYS_UWORD16 bytes_in_rx_buffer;
+    volatile SYS_UWORD8 *rx_in;
+
+    rx_in = uart->rx_in;
+
+    if (uart->rx_out <= rx_in)
+        bytes_in_rx_buffer = (SYS_UWORD16) (rx_in - uart->rx_out);
+    else
+        bytes_in_rx_buffer =
+            (SYS_UWORD16) (rx_in - uart->rx_out + uart->buffer_size + 1);
+
+    return (bytes_in_rx_buffer);
+}
+
+/*******************************************************************************
+ *
+ *                          get_bytes_in_tx_buffer
+ * 
+ * Purpose  : Gets the number of bytes in the TX buffer.
+ *
+ * Arguments: In : uart: Pointer on the UART structure.
+ *            Out: none
+ *
+ * Returns  : The number of bytes in the TX buffer.
+ *
+ ******************************************************************************/
+
+static SYS_UWORD16
+get_bytes_in_tx_buffer (t_uart *uart)
+{
+    SYS_UWORD16 bytes_in_tx_buffer;
+    volatile SYS_UWORD8 *tx_out;
+
+    tx_out = uart->tx_out;
+
+    if (tx_out <= uart->tx_in)
+        bytes_in_tx_buffer = (SYS_UWORD16) (uart->tx_in - tx_out);
+    else
+        bytes_in_tx_buffer =
+            (SYS_UWORD16) (uart->tx_in - tx_out + uart->buffer_size + 1);
+
+    return (bytes_in_tx_buffer);
+}
+
+/*******************************************************************************
+ *
+ *                              compute_break_time
+ * 
+ * Purpose  : Computes a number of TDMA from 3 parameters:
+ *              - baudrate,
+ *              - bits per character including start bit, stop bits and parity,
+ *              - number of characters.
+ *            Due to the TDMA value (4.6 ms), a minimal value is sent: 2 TDMA.
+ *
+ * Arguments: In : baudrate
+ *                 bits_per_char
+ *                 number_of_chars
+ *            Out: none
+ *
+ * Returns  : The number of TDMA.
+ *
+ ******************************************************************************/
+
+static UNSIGNED
+compute_break_time (UNSIGNED baudrate,
+                    UNSIGNED bits_per_char,
+                    UNSIGNED number_of_chars)
+{
+    UNSIGNED number_of_tdma;
+
+    number_of_tdma = CONVERT_TIME_IN_TDMA (
+                         1000 * bits_per_char * number_of_chars / baudrate);
+
+    if (number_of_tdma == 0)
+        number_of_tdma = 1;
+
+    number_of_tdma++;
+
+    return (number_of_tdma);
+}
+
+/*******************************************************************************
+ *
+ *                          update_reading_callback
+ * 
+ * Purpose  : Updates the sizes array and the addresses array and get and builds
+ *            the state parameter defined in UAF_GetLineState to call the
+ *            readOutFunc function.
+ *
+ * Arguments: In : uart       : Pointer on the UART structure.
+ *                 call_source: 0: LISR, 1: application.
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+
+static void
+update_reading_callback (t_uart *uart,
+                         SYS_BOOL call_source)
+{
+    SYS_UWORD32  state;
+    SYS_UWORD8  fragments_number;
+    SYS_UWORD16 bytes_in_rx_buffer;
+    volatile SYS_UWORD8 *rx_in;
+
+    /*
+     * Update the sizes array and the addresses array.
+     * A copy of rx_in is used because it may be updated by the interrupt
+     * handler if this function is called from the application.
+     */
+
+    rx_in = uart->rx_in;
+    
+    if (uart->rx_out < rx_in) {
+
+        fragments_number = 1;
+
+        uart->rd_address[0] = uart->rx_out;
+        uart->rd_size_before_call[0] = (SYS_UWORD16) (rx_in - uart->rx_out);
+        uart->rd_size_after_call[0] = uart->rd_size_before_call[0];
+
+        uart->rd_size_before_call[1] = 0;
+        uart->rd_size_after_call[1] = 0;
+
+        bytes_in_rx_buffer = uart->rd_size_before_call[0];
+
+    } else if (rx_in == uart->rx_out) { /* RX buffer empty. */
+        
+        fragments_number = 1;
+
+        uart->rd_address[0] = uart->rx_out;
+        uart->rd_size_before_call[0] = 0;
+        uart->rd_size_after_call[0] = 0;
+
+        uart->rd_size_before_call[1] = 0;
+        uart->rd_size_after_call[1] = 0;
+
+        bytes_in_rx_buffer = 0;
+                    
+    } else {
+    
+        fragments_number = 2;
+
+        uart->rd_address[0] = uart->rx_out;
+        uart->rd_size_before_call[0] =
+            uart->buffer_size + 1 - (SYS_UWORD16) (uart->rx_out -
+                                               &(uart->rx_buffer[0]));
+        uart->rd_size_after_call[0] = uart->rd_size_before_call[0];
+
+        uart->rd_address[1] = &(uart->rx_buffer[0]);
+        uart->rd_size_before_call[1] = (SYS_UWORD16) (rx_in -
+                                                  &(uart->rx_buffer[0]));
+        uart->rd_size_after_call[1] = uart->rd_size_before_call[1];
+
+        bytes_in_rx_buffer =
+            uart->rd_size_before_call[0] + uart->rd_size_before_call[1];
+
+        if (!uart->rd_size_before_call[1])
+            fragments_number = 1;
+    }
+
+    /*
+     * Build the state parameter defined in UAF_GetLineState.
+     * The field state_2 is used when state_1 is set to 0 to avoid to
+     * lose events detected in the RX interrupt handler.
+     */
+
+    state = uart->state_2;
+    uart->state_2 = 0;
+    uart->state = &(uart->state_2);
+
+    state |= uart->state_1;
+    uart->state_1 = 0;
+    uart->state = &(uart->state_1);
+
+    state |= ((((SYS_UWORD32) uart->cts_level) << RTS) |
+
+              (((SYS_UWORD32) (uart->tx_stopped_by_application |
+                         uart->tx_stopped_by_driver)) << TXSTP) |
+
+              (((SYS_UWORD32) (uart->rx_stopped_by_application |
+                         uart->rx_stopped_by_driver)) << RXSTP) |
+
+              (((SYS_UWORD32) (uart->buffer_size - bytes_in_rx_buffer)) << RXBLEV));
+
+    /*
+     * Fields SA, SB and X are set according to the flow control:
+     *
+     *       None    RTS/CTS    XON/XOFF
+     * SA    0 (ns)  0 (ns)     0 (ns)
+     * SB    RTS     0          RTS
+     * X     0       RTS        XON:0 XOFF:1 (transmitter)
+     *
+     * ns: signal not supported.
+     * DTR/DSR flow control is not supported.
+     */
+
+    if (uart->flow_control_mode != fc_rts)
+        state |= (((SYS_UWORD32) uart->cts_level) << SB);
+
+    if (uart->flow_control_mode == fc_rts)
+        state |= (((SYS_UWORD32) uart->cts_level) << X);
+            
+    else if ((uart->flow_control_mode == fc_xoff) &&
+             (uart->tx_stopped_by_application ||
+              uart->tx_stopped_by_driver))
+        state |= (1 << X);
+
+    /*
+     * Call the readOutFunc function with these parameters.
+     */
+
+    uart->rd_call_setup = rm_notDefined;
+
+    (*(uart->readOutFunc)) (call_source & 0x01, /* From HISR or application */
+                            &(uart->rd_call_setup),
+                            fragments_number,
+                            &(uart->rd_address[0]),
+                            &(uart->rd_size_after_call[0]),
+                            state);
+}
+
+/*******************************************************************************
+ *
+ *                          update_writing_callback
+ * 
+ * Purpose  : Updates the sizes array and the addresses array to call the
+ *            writeInFunc function.
+ *
+ * Arguments: In : uart      : Pointer on the UART structure.
+ *                 call_source: 0: LISR, 1: application.
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+
+static void
+update_writing_callback (t_uart *uart,
+                         SYS_BOOL call_source)
+{
+    SYS_UWORD8 fragments_number;
+    volatile SYS_UWORD8 *tx_out;
+
+    /*
+     * Update the sizes array and the addresses array.
+     * A copy of tx_out is used because it may be updated by the interrupt
+     * handler if this function is called from the application.
+     */
+
+    tx_out = uart->tx_out;
+    
+    if (uart->tx_in < tx_out) {
+
+        fragments_number = 1;
+
+        uart->wr_address[0] = uart->tx_in;
+        uart->wr_size_before_call[0] =
+            (SYS_UWORD16) (tx_out - uart->tx_in - 1);
+        uart->wr_size_after_call[0] = uart->wr_size_before_call[0];
+
+        uart->wr_size_before_call[1] = 0;
+        uart->wr_size_after_call[1] = 0;
+                                    
+    } else if (tx_out == &(uart->tx_buffer[0])) {
+        
+        fragments_number = 1;
+
+        uart->wr_address[0] = uart->tx_in;
+        uart->wr_size_before_call[0] =
+            uart->buffer_size - 
+            (SYS_UWORD16) (uart->tx_in - &(uart->tx_buffer[0]));
+        uart->wr_size_after_call[0] = uart->wr_size_before_call[0];
+
+        uart->wr_size_before_call[1] = 0;
+        uart->wr_size_after_call[1] = 0;
+
+    } else {
+
+        fragments_number = 2;
+
+        uart->wr_address[0] = uart->tx_in;
+        uart->wr_size_before_call[0] =
+            uart->buffer_size + 1 - 
+            (SYS_UWORD16) (uart->tx_in - &(uart->tx_buffer[0]));
+        uart->wr_size_after_call[0] = uart->wr_size_before_call[0];
+
+        uart->wr_address[1] = &(uart->tx_buffer[0]);
+        uart->wr_size_before_call[1] =
+            (SYS_UWORD16) (tx_out - &(uart->tx_buffer[0]) - 1);
+        uart->wr_size_after_call[1] = uart->wr_size_before_call[1];
+
+        if (!uart->wr_size_before_call[1])
+            fragments_number = 1;
+    }
+
+    /*
+     * Call the writeInFunc function with these parameters;
+     */
+
+    uart->wr_call_setup = rm_notDefined;
+
+    (*(uart->writeInFunc)) (call_source,
+                            &(uart->wr_call_setup),
+                            fragments_number,
+                            &(uart->wr_address[0]),
+                            &(uart->wr_size_after_call[0]));
+}
+
+/*******************************************************************************
+ *
+ *                                  stop_break
+ * 
+ * Purpose  : The timer is activated to expire when a time corresponding to the
+ *            sending time of 2 characters at least has elapsed. After a break,
+ *            no character may be sent during this period.
+ *
+ * Arguments: In : uartNo: Irda or Modem
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+
+static VOID
+stop_break (T_fd_UartId uartNo)
+{
+    t_uart *uart;
+
+    uart = &(uart_parameters[uartNo]);
+
+    uart->break_to_send = 0;
+    uart->break_in_progress = 0;
+
+    /*
+     * Disable sleep mode then unmask Tx interrupt.
+     */
+          
+    WRITE_UART_REGISTER (
+        uart, IER, READ_UART_REGISTER (uart, IER) & ~IER_SLEEP);
+
+    WRITE_UART_REGISTER (
+        uart, IER, READ_UART_REGISTER (uart, IER) | ETBEI);
+}
+
+static VOID
+stop_break_entry_point_1(UNSIGNED id)
+{
+    stop_break( UAF_UART_0 ); // uart Irda
+}
+static VOID
+stop_break_entry_point_2(UNSIGNED id)
+{
+    stop_break( UAF_UART_1 ); // uart Modem
+}
+
+/*******************************************************************************
+ *
+ *                          hisr_start_break
+ * 
+ * Purpose  : Enables the timer used to control the time without character.
+ *
+ * Arguments: In : none
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+static VOID
+hisr_start_break (T_fd_UartId uartNo)
+{
+    t_uart *uart;
+
+    uart = &(uart_parameters[uartNo]);
+
+    (void) NU_Control_Timer (&(uart->break_timer_ctrl_block),
+                             NU_DISABLE_TIMER);
+
+
+    (void) NU_Reset_Timer (&(uart->break_timer_ctrl_block),
+                           stop_break_tab[uartNo],
+                           uart->time_without_character,
+                           0, /* The timer expires once. */
+                           NU_DISABLE_TIMER);
+
+    (void) NU_Control_Timer (&(uart->break_timer_ctrl_block),
+                             NU_ENABLE_TIMER);
+}
+static VOID
+hisr_start_break_entry_point_1( VOID )
+{
+    hisr_start_break( UAF_UART_0 ); // uart Irda
+}
+
+static VOID
+hisr_start_break_entry_point_2( VOID )
+{
+    hisr_start_break( UAF_UART_1 ); // uart Modem
+}
+
+/*******************************************************************************
+ *
+ *                              stop_receiver
+ * 
+ * Purpose  : Activates DTR or RTS or sends XOFF. 
+ *
+ * Arguments: In : uart: Pointer on the UART structure.
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+
+static void
+stop_receiver (t_uart *uart)
+{
+    /*
+     * Disable sleep mode.
+     */
+          
+    WRITE_UART_REGISTER (
+        uart, IER, READ_UART_REGISTER (uart, IER) & ~IER_SLEEP);
+
+    switch (uart->flow_control_mode) {
+
+    case fc_rts:
+
+        /*
+         * CTS (RTS on UART side) is deactivated (high).
+         */
+
+        WRITE_UART_REGISTER (
+            uart, MCR, READ_UART_REGISTER (uart, MCR) & ~MRTS);
+        break;
+
+    case fc_xoff:
+
+        uart->xon_xoff_to_send = uart->xoff_character;
+        uart->send_xon_xoff = 1;
+
+        /*
+         * Unmask Tx interrupt.
+         */
+          
+        WRITE_UART_REGISTER (
+            uart, IER, READ_UART_REGISTER (uart, IER) | ETBEI);
+        break;
+    }
+}
+
+/*******************************************************************************
+ *
+ *                              start_receiver
+ * 
+ * Purpose  : Deactivates DTR or RTS or sends XON.
+ *
+ * Arguments: In : uart: Pointer on the UART structure.
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+
+static void
+start_receiver (t_uart *uart)
+{
+    /*
+     * Disable sleep mode.
+     */
+          
+    WRITE_UART_REGISTER (
+        uart, IER, READ_UART_REGISTER (uart, IER) & ~IER_SLEEP);
+
+    switch (uart->flow_control_mode) {
+
+    case fc_rts:
+
+        /*
+         * CTS (RTS on UART side) is activated (low).
+         */
+
+        WRITE_UART_REGISTER (
+            uart, MCR, READ_UART_REGISTER (uart, MCR) | MRTS);
+        break;
+
+    case fc_xoff:
+
+        uart->xon_xoff_to_send = uart->xon_character;
+        uart->send_xon_xoff = 1;
+
+        /*
+         * Unmask Tx interrupt.
+         */
+          
+        WRITE_UART_REGISTER (
+            uart, IER, READ_UART_REGISTER (uart, IER) | ETBEI);
+        break;
+    }
+}
+
+/*******************************************************************************
+ *
+ *                          add_esc_seq_char_in_rx_buffer
+ * 
+ * Purpose  : Writes one escape sequence character in the RX buffer.
+ *
+ * Arguments: In : uart: Pointer on the UART structure.
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+
+static void
+add_esc_seq_char_in_rx_buffer (t_uart *uart)
+{
+    /*
+     * IF the RX buffer is not full, write an escape sequence character in the
+     * RX buffer and check wrap-around.
+     */
+
+    if (!RX_BUFFER_FULL (uart)) {
+
+        *(uart->rx_in++) = uart->esc_seq_character;
+
+        if (uart->rx_in == &(uart->rx_buffer[0]) + uart->buffer_size + 1)
+            uart->rx_in = &(uart->rx_buffer[0]);
+    }
+}
+
+/*******************************************************************************
+ *
+ *                      analyze_guard_period_timer_expiration
+ * 
+ * Purpose  : According to the state of the escape sequence detection, 1 or 2
+ *            escape sequence characters may be written into the TX buffer or
+ *            the escape sequence is declared as detected.
+ *            If 1 or 2 escape sequence characters have been detected the
+ *            guard period must not expire.
+ *            If 3 characters have been detected the escape sequence must
+ *            expire.
+ *
+ * Arguments: In : id: parameter not used.
+ *            Out: none
+ *
+ * Returns  : none 
+ *
+ ******************************************************************************/
+
+static VOID
+analyze_guard_period_timer_expiration (T_fd_UartId uartNo)
+{
+    t_uart *uart;
+    SYS_UWORD16 bytes_in_rx_buffer;
+
+    uart = &(uart_parameters[uartNo]);
+
+    switch (uart->esc_seq_detection_state) {
+    
+    case ONE_CHAR_DETECTED:
+    
+        /*
+         * 1 escape sequence character has been detected. The guard period has
+         * ellapsed. This character is written into the TX buffer.
+         */
+        
+        add_esc_seq_char_in_rx_buffer (uart);
+        break;
+        
+    case TWO_CHARS_DETECTED:
+    
+        /*
+         * 2 escape sequence characters have been detected. The guard period has
+         * ellapsed. These characters are written into the TX buffer.
+         */
+        
+        add_esc_seq_char_in_rx_buffer (uart);
+        add_esc_seq_char_in_rx_buffer (uart);
+
+        break;
+        
+    case THREE_CHARS_DETECTED:
+
+        /*
+         * 3 escape sequence characters have been detected and the guard period
+         * has ellapsed. The escape sequence is detected.
+         */    
+
+        uart->esc_seq_received = 1;
+        *(uart->state) |= (1 << ESC);
+
+        break;
+    }
+    
+    uart->esc_seq_detection_state = NO_ESCAPE_SEQUENCE;
+    
+    /*
+     * If the high watermark is reached, RTS is activated or XOFF is sent
+     * according to the flow control mode.
+     */
+
+    bytes_in_rx_buffer = get_bytes_in_rx_buffer (uart);
+
+    if ((uart->flow_control_mode != fc_none) &&
+        (bytes_in_rx_buffer >= RX_HIGH_WATERMARK (uart->buffer_size))) {
+
+        /*
+         * Check if receipt must be stopped.
+         */
+
+        if (!uart->rx_stopped_by_driver) {
+
+            uart->rx_stopped_by_driver = 1;
+            if (!uart->rx_stopped_by_application)
+                stop_receiver (uart);
+        }
+    }
+
+    /*
+     * If a reading was suspended or if the callback function is installed,
+     * it is called if one of these conditions is fulfiled:
+     *      - the RX threshold level is reached,
+     *      - a break has been detected,
+     *      - an escape sequence has been detected,
+     */
+
+    if ((!uart->rd_call_from_hisr_in_progress) &&
+        (uart->reading_suspended ||
+         (uart->rd_call_setup == rm_reInstall))) {
+
+        if ((bytes_in_rx_buffer >= uart->rx_threshold_level) ||
+            uart->break_received ||
+            uart->esc_seq_received) {
+
+            uart->rd_call_from_hisr_in_progress = 1;
+            update_reading_callback (uart, 1); /* 1: call from HISR. */
+
+            uart->reading_suspended = 0;
+            uart->break_received = 0;
+            uart->esc_seq_received = 0;
+        }
+    }
+}
+static VOID
+analyze_guard_period_timer_expiration_entry_1(UNSIGNED id)
+{
+    analyze_guard_period_timer_expiration( UAF_UART_0 ); // uart Irda
+}
+
+static VOID
+analyze_guard_period_timer_expiration_entry_2(UNSIGNED id)
+{
+    analyze_guard_period_timer_expiration( UAF_UART_1 ); // uart Modem
+}
+
+/*******************************************************************************
+ *
+ *                          stop_guard_period_timer
+ * 
+ * Purpose  : Stops the timer used to detect the guard period expiration.
+ *
+ * Arguments: In : uart: Pointer on the UART structure.
+ *            Out: none
+ *
+ * Returns  : none 
+ *
+ ******************************************************************************/
+
+static void
+stop_guard_period_timer (t_uart *uart)
+{
+    (void) NU_Control_Timer (&(uart->guard_period_timer_ctrl_block),
+                             NU_DISABLE_TIMER);
+}
+
+/*******************************************************************************
+ *
+ *                          start_guard_period_timer
+ * 
+ * Purpose  : Starts a timer which expires if the guard period has ellapsed.
+ *
+ * Arguments: In : uart: Pointer on the UART structure.
+ *            Out: none
+ *
+ * Returns  : none 
+ *
+ ******************************************************************************/
+
+static void
+start_guard_period_timer (T_fd_UartId uartNo)
+{
+    t_uart *uart;
+
+    uart = &(uart_parameters[uartNo]);
+
+    (void) NU_Control_Timer (&(uart->guard_period_timer_ctrl_block),
+                             NU_DISABLE_TIMER);
+
+    (void) NU_Reset_Timer (&(uart->guard_period_timer_ctrl_block),
+                           analyze_guard_period_timer_expiration_tab[uartNo],
+                           uart->guard_period,
+                           0, /* The timer expires once. */
+                           NU_DISABLE_TIMER);
+
+    (void) NU_Control_Timer (&(uart->guard_period_timer_ctrl_block),
+                             NU_ENABLE_TIMER);
+}
+
+/*******************************************************************************
+ *
+ *                          detect_escape_sequence
+ * 
+ * Purpose  : The state machine used to detect an escape sequence is updated
+ *            according to the array of bytes to analyse. If the state machine
+ *            goes to the initial state due to a break in the sequence
+ *            detection, the previous characters are put into the RX buffer.
+ *
+ * Arguments: In : uart: Pointer on the UART structure.
+ *            Out: none
+ *
+ * Returns  : 0: Break in detection or a sequence has been detected. 
+ *            1: A sequence may be detected.
+ *
+ ******************************************************************************/
+
+static int
+detect_escape_sequence (T_fd_UartId uartNo)
+{
+    t_uart *uart;
+    int      detection_result;
+    SYS_UWORD8    *rx_fifo_byte;
+    SYS_UWORD16   bytes_in_rx_buffer;
+    UNSIGNED elapsed_time;
+
+    uart = &(uart_parameters[uartNo]);
+    detection_result = 0;
+
+    rx_fifo_byte = uart->rx_buffer_used_by_rx_hisr;
+    if (rx_fifo_byte == &(uart->rx_fifo_byte_1[0]))
+        bytes_in_rx_buffer = uart->bytes_in_rx_buffer_1;
+    else
+        bytes_in_rx_buffer = uart->bytes_in_rx_buffer_2;
+
+    if (uart->current_time > uart->previous_time)
+        elapsed_time = uart->current_time - uart->previous_time;
+    else
+        elapsed_time =
+            MAX_UNSIGNED_32 - uart->previous_time + uart->current_time;
+
+    switch (uart->esc_seq_detection_state) {
+
+    case INITIALIZATION:
+
+        /*
+         * It is the first character received. It may be the first character
+         * of an escape sequence. The elapsed_time variable is set to the
+         * guard period value to consider this character as the first character
+         * of an escape sequence.
+         */
+
+        if (!uart->esc_seq_modified) {
+
+            elapsed_time = uart->guard_period;
+            uart->esc_seq_detection_state = NO_ESCAPE_SEQUENCE;
+        }
+
+        /* No break! */
+
+    case NO_ESCAPE_SEQUENCE:
+
+        /*
+         * To go to the next state (one, two or three characters detected):
+         *      - a guard period must have elapsed since the last receipt,
+         *      - the characters must belong to the escape sequence.
+         */
+
+        if ((elapsed_time >= uart->guard_period) &&
+            (!uart->esc_seq_modified)) {
+
+            switch (bytes_in_rx_buffer) {
+
+            case 1:
+
+                if (*rx_fifo_byte++ == uart->esc_seq_character) {
+                
+                    uart->esc_seq_detection_state = ONE_CHAR_DETECTED;
+                    start_guard_period_timer(uartNo);
+                    detection_result = 1;
+                }
+
+                break;
+
+            case 2:
+
+                if ((*rx_fifo_byte++ == uart->esc_seq_character) &&
+                    (*rx_fifo_byte++ == uart->esc_seq_character)) {
+                    
+                    uart->esc_seq_detection_state = TWO_CHARS_DETECTED;
+                    start_guard_period_timer (uartNo);
+                    detection_result = 1;
+                }
+                                    
+                break;
+
+            case 3:
+
+                if ((*rx_fifo_byte++ == uart->esc_seq_character) &&
+                    (*rx_fifo_byte++ == uart->esc_seq_character) &&
+                    (*rx_fifo_byte++ == uart->esc_seq_character)) {
+                        
+                    uart->esc_seq_detection_state = THREE_CHARS_DETECTED;
+                    start_guard_period_timer (uartNo);
+                    detection_result = 1;
+                }
+                    
+                break;
+
+            default:
+            
+                /*
+                 * No action.
+                 */
+
+                break;
+            }
+        }
+
+        uart->previous_time = uart->current_time;
+
+        break;
+
+    case ONE_CHAR_DETECTED:
+
+        /*
+         * To go to the next state (two or three characters detected):
+         *      - the difference between the current time and the previous time
+         *        must be less than the guard period,
+         *      - the characters must belong to the escape sequence.
+         * Otherwise, an escape sequence character is written in the RX buffer.
+         */
+
+        if (!uart->esc_seq_modified) {
+
+            switch (bytes_in_rx_buffer) {
+
+            case 1:
+
+                if (*rx_fifo_byte++ == uart->esc_seq_character) {
+                
+                    uart->esc_seq_detection_state = TWO_CHARS_DETECTED;
+                    detection_result = 1;                
+                }
+
+                break;
+
+            case 2:
+
+                if ((*rx_fifo_byte++ == uart->esc_seq_character) &&
+                    (*rx_fifo_byte++ == uart->esc_seq_character)) {
+                
+                    start_guard_period_timer (uartNo); /* Reset the timer. */
+                       
+                    uart->esc_seq_detection_state = THREE_CHARS_DETECTED;
+                    detection_result = 1;                    
+                }
+                    
+                break;
+
+            default:
+
+                /*
+                 * No action.
+                 */
+
+                break;
+            }
+        }
+
+        if (!detection_result) {
+
+            add_esc_seq_char_in_rx_buffer (uart);
+
+            uart->previous_time = uart->current_time;
+            uart->esc_seq_detection_state = NO_ESCAPE_SEQUENCE;
+        }
+
+        break;
+
+    case TWO_CHARS_DETECTED:
+
+        /*
+         * To go to the next state (three chars detected):
+         *      - the difference between the current time and the previous time
+         *        must be less than the guard period,
+         *      - the character must belong to the escape sequence.
+         * Otherwise, 2 escape sequence characters are written in the RX buffer.
+         */
+
+        if (!uart->esc_seq_modified) {
+
+            switch (bytes_in_rx_buffer) {
+
+            case 1:
+
+                if (*rx_fifo_byte++ == uart->esc_seq_character) {
+
+                    start_guard_period_timer (uartNo); /* Reset the timer. */
+                    
+                    uart->esc_seq_detection_state = THREE_CHARS_DETECTED;
+                    detection_result = 1;
+                }
+                
+                break;
+
+            default:
+
+                /*
+                 * No action.
+                 */
+
+                break;
+            }
+        }
+
+        if (!detection_result) {
+
+            add_esc_seq_char_in_rx_buffer (uart);
+            add_esc_seq_char_in_rx_buffer (uart);
+
+            uart->previous_time = uart->current_time;
+            uart->esc_seq_detection_state = NO_ESCAPE_SEQUENCE;
+        }
+
+        break;
+
+    case THREE_CHARS_DETECTED:
+
+        /*
+         * An escape sequence is detected if a guard period has elapsed since
+         * the last receipt. Otherwise, 3 escape sequence characters are
+         * written in the RX buffer.
+         */
+
+        stop_guard_period_timer (uart);
+
+        add_esc_seq_char_in_rx_buffer (uart);
+        add_esc_seq_char_in_rx_buffer (uart);
+        add_esc_seq_char_in_rx_buffer (uart);
+
+        uart->previous_time = uart->current_time;
+        uart->esc_seq_detection_state = NO_ESCAPE_SEQUENCE;
+
+        break;
+    }
+
+    return (detection_result);
+}
+
+/*******************************************************************************
+ *
+ *                              send_break
+ * 
+ * Purpose  : This function may only called if the TX FIFO is empty.
+ *            Null characters are written in the TX FIFO. The number of bytes to
+ *            write has been defined with UAF_SetLineState. Enables the break
+ *            condition.
+ *
+ * Arguments: In : uart: Pointer on the UART structure.
+ *            Out: none
+ *
+ * Returns  : Number of bytes sent.
+ *
+ ******************************************************************************/
+
+static SYS_UWORD16
+send_break (t_uart *uart)
+{
+    SYS_UWORD16 bytes_in_tx_fifo;
+
+    bytes_in_tx_fifo = 0;
+    uart->break_in_progress = 1;
+
+    /*
+     * Disable sleep mode.
+     */
+
+    WRITE_UART_REGISTER (
+        uart, IER, READ_UART_REGISTER (uart, IER) & ~IER_SLEEP);
+
+    WRITE_UART_REGISTER (
+        uart, LCR, READ_UART_REGISTER (uart, LCR) | BREAK_CONTROL);
+      
+    /*
+     * Re-enable sleep mode.
+     */
+
+    WRITE_UART_REGISTER (
+        uart, IER, READ_UART_REGISTER (uart, IER) | IER_SLEEP);
+
+    while (uart->break_length) {
+
+        WRITE_UART_REGISTER (uart, THR, 0x00);
+        uart->break_length--;
+        bytes_in_tx_fifo++;
+    }
+
+    return (bytes_in_tx_fifo);
+}
+
+/*******************************************************************************
+ *
+ *                              build_rx_fifo_array
+ * 
+ * Purpose  : Reads the RX FIFO to build an array with bytes read.
+ *            A byte is written in this array if no error is detected. 
+ *
+ * Arguments: In : uart: Pointer on the UART structure.
+ *            Out: none
+ *
+ * Returns  : The number of bytes in RX FIFO.
+ *
+ ******************************************************************************/
+
+static SYS_UWORD16
+build_rx_fifo_array (t_uart *uart)
+{
+    SYS_UWORD8  status;
+    SYS_UWORD8  *first_byte;
+    SYS_UWORD8  *current_byte;
+    SYS_UWORD16 *bytes_in_rx_buffer;
+    SYS_UWORD16 bytes_received;
+
+    bytes_received = 0;
+    
+    /*
+     * Switch to the other buffer.
+     */
+     
+    first_byte = uart->rx_buffer_used_by_rx_lisr;
+    if (first_byte == &(uart->rx_fifo_byte_1[0])) {
+    
+        first_byte = &(uart->rx_fifo_byte_2[0]);
+        bytes_in_rx_buffer = &(uart->bytes_in_rx_buffer_2);
+    
+    } else {
+    
+        first_byte = &(uart->rx_fifo_byte_1[0]);
+        bytes_in_rx_buffer = &(uart->bytes_in_rx_buffer_1);
+    }
+
+    current_byte = first_byte;
+    uart->rx_buffer_used_by_rx_lisr = first_byte;
+    
+    status = READ_UART_REGISTER (uart, LSR);
+
+    /*
+     * Build an array with the bytes contained in the RX FIFO.
+     */
+
+    while (status & DR) { /* While RX FIFO is not empty... */
+
+        *current_byte = READ_UART_REGISTER (uart, RHR);
+
+        /*
+         * Check if a parity error or a framing error is associated with the
+         * received data. If there is an error the byte is not copied into the
+         * bytes array.
+         */
+
+        if (status & BYTE_ERROR) {
+
+            if (status & OE)
+                uart->overrun_error++;
+
+            if (status & PE)
+                uart->parity_error++;
+
+            if (status & FE)
+                uart->framing_error++;
+
+            /*
+             * Check break detection.
+             */
+
+            if (status & BI) {
+            
+                uart->break_received = 1;
+                *(uart->state) |=
+                    ((1 << BRK) | (MINIMAL_BREAK_LENGTH << BRKLEN));
+            }
+
+        } else 
+            current_byte++;
+
+        status = READ_UART_REGISTER (uart, LSR);
+    }
+
+    bytes_received = (SYS_UWORD16) (current_byte - first_byte);
+    *bytes_in_rx_buffer = bytes_received;
+
+    /*
+     * Re-switch to the other buffer if no valid character has been received.
+     */
+
+    if (!bytes_received) {
+         
+        if (uart->rx_buffer_used_by_rx_lisr == &(uart->rx_fifo_byte_1[0]))
+            uart->rx_buffer_used_by_rx_lisr = &(uart->rx_fifo_byte_2[0]);
+        
+        else
+            uart->rx_buffer_used_by_rx_lisr = &(uart->rx_fifo_byte_1[0]);
+    }
+
+    if (bytes_received > uart->max_rx_fifo_level)
+        uart->max_rx_fifo_level = bytes_received;
+        
+    return (bytes_received);
+}
+
+/*******************************************************************************
+ *
+ *                              empty_rx_fifo
+ * 
+ * Purpose  : Read the RX FIFO.
+ *
+ * Arguments: In : uart: Pointer on the UART structure.
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+
+static void
+empty_rx_fifo (t_uart *uart)
+{
+    SYS_UWORD16 bytes_in_rx_fifo;
+    volatile SYS_UWORD8 dummy_byte;
+
+    bytes_in_rx_fifo = 0;
+
+    while (READ_UART_REGISTER (uart, LSR) & DR) {
+
+        dummy_byte = READ_UART_REGISTER (uart, RHR);
+        bytes_in_rx_fifo++;
+    }
+
+    if (bytes_in_rx_fifo > uart->max_rx_fifo_level)
+        uart->max_rx_fifo_level = bytes_in_rx_fifo;
+}
+
+/*******************************************************************************
+ *
+ *                          hisr_execute_rx_operations
+ * 
+ * Purpose  : If an escape sequence is detected or if a break in the detection
+ *            has occured RX FIFO bytes are written in the RX buffer. 
+ *            If the software flow control is used bytes are analyzed to know
+ *            if a XON or a XOFF character is received to stop or start the
+ *            transmitter. 
+ *            If a flow control is used and if the high watermark of the RX
+ *            buffer is reached the receiver is stopped.
+ *            If the RX threshold level is reached the callback mechanism is
+ *            activated.
+ *
+ * Arguments: In : none
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+static VOID
+hisr_execute_rx_operations ( T_fd_UartId uartNo )
+{
+    SYS_UWORD16 bytes_free_in_rx_buffer;
+    SYS_UWORD16 wrap_around_counter;
+    SYS_UWORD16 bytes_in_rx_buffer;
+    SYS_UWORD16 bytes_read;
+    SYS_UWORD8  *current_byte;
+    SYS_UWORD8  xon_xoff_detected;
+    t_uart *uart;
+
+    xon_xoff_detected = 0;
+    
+    uart = &(uart_parameters[uartNo]);    
+    
+    /*
+     * Switch to the other buffer.
+     */
+     
+    current_byte = uart->rx_buffer_used_by_rx_hisr;
+    if (current_byte == &(uart->rx_fifo_byte_1[0])) {
+    
+        current_byte = &(uart->rx_fifo_byte_2[0]);
+        bytes_read = uart->bytes_in_rx_buffer_2;
+    
+    } else {
+    
+        current_byte = &(uart->rx_fifo_byte_1[0]);
+        bytes_read = uart->bytes_in_rx_buffer_1;
+    }
+
+    uart->rx_buffer_used_by_rx_hisr = current_byte;
+
+    /*
+     * All bytes are copied into the RX buffer only if an escape sequence has
+     * been detected or a break in the detection has occured.
+     */
+
+    if (!detect_escape_sequence (uartNo)) {
+
+        if (uart->rx_out > uart->rx_in)
+            bytes_free_in_rx_buffer = (SYS_UWORD16) (uart->rx_out - uart->rx_in - 1);
+        else
+            bytes_free_in_rx_buffer =
+                (SYS_UWORD16) (uart->buffer_size + uart->rx_out - uart->rx_in);
+
+        wrap_around_counter = uart->buffer_size + 1 -
+                              (SYS_UWORD16) (uart->rx_in - &(uart->rx_buffer[0]));
+        
+        if (uart->flow_control_mode == fc_xoff) {
+        
+            while (bytes_read && bytes_free_in_rx_buffer) {
+
+                /*
+                 * If the data received is XON or XOFF, the transmitter is
+                 * enabled (XON) or disabled (XOFF).
+                 */
+
+                if (*current_byte == uart->xoff_character) {
+
+                    uart->tx_stopped_by_driver = 1;
+                    xon_xoff_detected = 1;
+
+                } else if (*current_byte == uart->xon_character) {
+
+                    uart->tx_stopped_by_driver = 0;
+                    xon_xoff_detected = 1;
+
+                    /*
+                     * Disable sleep mode then unmask Tx interrupt.
+                     */
+          
+                    WRITE_UART_REGISTER (
+                        uart, IER, READ_UART_REGISTER (uart, IER) & ~IER_SLEEP);
+
+                    WRITE_UART_REGISTER (
+                        uart, IER, READ_UART_REGISTER (uart, IER) | ETBEI);
+
+                } else {
+    
+                    *(uart->rx_in++) = *current_byte;
+
+                    wrap_around_counter--;
+                    if (!wrap_around_counter) {
+                    
+                        uart->rx_in = &(uart->rx_buffer[0]);
+                        wrap_around_counter = uart->buffer_size + 1;
+                    }
+                    
+                    bytes_free_in_rx_buffer--;
+                }
+
+                current_byte++;
+                bytes_read--;
+            }
+                
+        } else {
+        
+            while (bytes_read && bytes_free_in_rx_buffer) {
+
+                *(uart->rx_in++) = *current_byte++;
+                
+                wrap_around_counter--;
+                if (!wrap_around_counter) {
+                
+                    uart->rx_in = &(uart->rx_buffer[0]);
+                    wrap_around_counter = uart->buffer_size;
+                }
+                
+                bytes_free_in_rx_buffer--;
+                bytes_read--;
+            }
+        }
+
+        /*
+         * If the high watermark is reached, RTS is activated or XOFF is
+         * sent according to the flow control mode.
+         */
+
+        bytes_in_rx_buffer = get_bytes_in_rx_buffer (uart);
+
+        if ((uart->flow_control_mode != fc_none) &&
+            (bytes_in_rx_buffer >= RX_HIGH_WATERMARK (uart->buffer_size))) {
+
+            /*
+             * Check if receipt must be stopped.
+             */
+
+            if (!uart->rx_stopped_by_driver) {
+
+                uart->rx_stopped_by_driver = 1;
+                if (!uart->rx_stopped_by_application)
+                    stop_receiver (uart);
+            }
+        }
+
+        /*
+         * If a reading was suspended or if the callback function is installed,
+         * it is called if one of these conditions is fulfiled:
+         *      - the RX threshold level is reached,
+         *      - a break has been detected,
+         */
+
+        if ((!uart->rd_call_from_hisr_in_progress) &&
+            (uart->reading_suspended ||
+             (uart->rd_call_setup == rm_reInstall))) {
+
+            if ((bytes_in_rx_buffer >= uart->rx_threshold_level) ||
+                uart->break_received ||
+                xon_xoff_detected) {
+
+                uart->rd_call_from_hisr_in_progress = 1;
+                update_reading_callback (uart, 3); /* 3: call from Rx HISR. */
+
+                uart->reading_suspended = 0;
+                uart->break_received = 0;
+                uart->esc_seq_received = 0;
+            }
+        }
+    }
+}
+
+static VOID
+hisr_execute_rx_entry_point_1 ( VOID )
+{
+    hisr_execute_rx_operations( UAF_UART_0 ); //uart Irda
+}
+static VOID
+hisr_execute_rx_entry_point_2 ( VOID )
+{
+    hisr_execute_rx_operations( UAF_UART_1 ); //uart Modem
+}
+
+/*******************************************************************************
+ *
+ *                          hisr_execute_v24_operations
+ * 
+ * Purpose  : The user's function is called if all conditions to call it are
+ *            fulfiled.
+ *
+ * Arguments: In : none
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+static VOID
+hisr_execute_v24_operations (T_fd_UartId uartNo)
+{
+    t_uart *uart;
+
+    uart = &(uart_parameters[uartNo]);
+
+    /*
+     * If a reading was suspended or if the callback function is installed,
+     * it is called.
+     */
+
+    if ((!DRIVER_DISABLED (uart)) &&
+        (!uart->rd_call_from_hisr_in_progress) &&
+        (uart->reading_suspended || (uart->rd_call_setup == rm_reInstall))) {
+
+        uart->rd_call_from_hisr_in_progress = 1;
+        update_reading_callback (uart, 1); /* 1: call from HISR. */
+
+        uart->reading_suspended = 0;
+        uart->break_received = 0;
+        uart->esc_seq_received = 0;
+    }
+}
+
+static VOID
+hisr_execute_v24_entry_point_1( VOID )
+{
+    hisr_execute_v24_operations( UAF_UART_0 ); // uart Irda
+}
+
+static VOID
+hisr_execute_v24_entry_point_2( VOID )
+{
+    hisr_execute_v24_operations( UAF_UART_1 ); // uart Modem
+}
+
+
+/*******************************************************************************
+ *
+ *                          hisr_execute_tx_operations
+ * 
+ * Purpose  : Writes bytes from the TX buffer to the TX FIFO.
+ *            The user's function is called if all conditions to call it are
+ *            fulfiled.
+ *
+ * Arguments: In : none
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+static VOID
+hisr_execute_tx_operations (T_fd_UartId uartNo)
+{
+    SYS_UWORD16 bytes_in_tx_buffer;
+    SYS_UWORD16 bytes_in_tx_fifo;
+    SYS_UWORD16 wrap_around_counter;
+    t_uart *uart;
+
+    uart = &(uart_parameters[uartNo]);
+
+    /*
+     * A TX interrupt may have occured during the previous TX HISR. This case
+     * may appear when a HISR having a higher priority has been activated when
+     * the TX HISR was activated. When the next TX HISR is activated, the TX
+     * FIFO may not be empty. Nothing is done until a TX interrupt will occur.
+     * The RX HISR will be activated again and the TX FIFO will be empty.
+     */
+
+    if (READ_UART_REGISTER (uart, LSR) & THRE) {
+
+        bytes_in_tx_fifo = 0;
+    
+        /*
+         * A request to send a XON/XOFF character may have been done by the 
+         * RX interrupt handler. The byte can be written because we are sure
+         * that the TX FIFO is not full.
+         */
+
+        if (uart->send_xon_xoff) {
+
+            WRITE_UART_REGISTER (uart, THR, uart->xon_xoff_to_send);
+            uart->send_xon_xoff = 0;
+            bytes_in_tx_fifo++;
+        }
+
+        if ((!uart->tx_stopped_by_application) &&
+            (!uart->tx_stopped_by_driver)) {
+
+            bytes_in_tx_buffer = get_bytes_in_tx_buffer (uart);
+            wrap_around_counter =
+                uart->buffer_size + 1 - (SYS_UWORD16) (uart->tx_out -
+                                                  &(uart->tx_buffer[0]));
+
+            /*
+             * Loading of only (FIFO_SIZE - 1) characters in the Tx FIFO to
+             * avoid the generation of a spurious Tx FIFO almost empty
+             * interrupt (Ulysse bug report #35), instead of checking SSR[0].
+			 * In normal mode for THR interrupt (i.e. use of trigger level)
+			 * must only load (FIFO_SIZE - Trigger_Level - 1)
+             */
+
+            while (bytes_in_tx_buffer &&
+                   //!(READ_UART_REGISTER (uart, SSR) & TX_FIFO_FULL)) {
+				   (bytes_in_tx_fifo < FIFO_SIZE)) {
+
+                WRITE_UART_REGISTER (uart, THR, *(uart->tx_out++));
+                bytes_in_tx_buffer--;
+                bytes_in_tx_fifo++;
+
+                wrap_around_counter--;
+                if (!wrap_around_counter) {
+                    
+                    uart->tx_out = &(uart->tx_buffer[0]);
+                    wrap_around_counter = uart->buffer_size + 1;
+                }
+            }
+
+            /*
+             * If a writing was suspended or if the callback function is
+             * installed, it is called if the TX threshold level is reached.
+             */
+
+            if ((!DRIVER_DISABLED (uart)) &&
+                (!uart->wr_call_from_hisr_in_progress) &&
+                (bytes_in_tx_buffer <= uart->tx_threshold_level) &&
+                ((uart->wr_call_setup == rm_reInstall) ||
+                 uart->writing_suspended)) {
+
+                uart->writing_suspended = 0;
+
+                uart->wr_call_from_hisr_in_progress = 1;
+                update_writing_callback (uart, 1); /* 1: call from HISR. */
+            }
+        }
+
+        if (bytes_in_tx_fifo)
+
+            /*
+             * Unmask Tx interrupt.
+             */
+          
+            WRITE_UART_REGISTER (
+                uart, IER, READ_UART_REGISTER (uart, IER) | ETBEI);
+
+        if ((!bytes_in_tx_fifo) && (uart->break_to_send))
+            bytes_in_tx_fifo = send_break (uart);
+
+        /*
+         * Re-enable the sleep mode.
+         */
+
+        WRITE_UART_REGISTER (
+            uart, IER, READ_UART_REGISTER (uart, IER) | IER_SLEEP);
+
+    }
+}
+
+
+static VOID
+hisr_execute_tx_entry_point_1 ( VOID )
+{
+    hisr_execute_tx_operations( UAF_UART_0 ); //uart Irda    
+}
+
+static VOID
+hisr_execute_tx_entry_point_2 ( VOID )
+{
+    hisr_execute_tx_operations( UAF_UART_1 ); //uart Modem    
+}
+
+/*******************************************************************************
+ *
+ *                              read_rx_fifo
+ * 
+ * Purpose  : Reads the RX FIFO. If the driver is enabled bytes are written in
+ *            an array to be analyzed by the RX HISR.
+ *
+ * Arguments: In : uart: Pointer on the UART structure.
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+
+static void
+read_rx_fifo (t_uart *uart)
+{
+
+    /*
+     * If the driver is disabled the RX FIFO is read to acknoledge the
+     * interrupt else bytes received are written into an array which will be
+     * analyzed from the RX HISR.
+     */
+    if (DRIVER_DISABLED (uart))
+        empty_rx_fifo (uart);
+#if (BOARD == 31)
+        else if ((*((volatile SYS_UWORD16 *) ARMIO_IN) & 0x0100) == 0x0000)
+		empty_rx_fifo (uart);
+#endif
+    else if (build_rx_fifo_array (uart))
+        (void) NU_Activate_HISR (&(uart->rx_hisr_ctrl_block));
+}
+
+/*******************************************************************************
+ *
+ *                          check_v24_input_lines
+ * 
+ * Purpose  : Check the V.24 input lines. According to the states of the input
+ *            lines and to the flow control mode selected, the transmitter is
+ *            enabled or disabled. The reading callback function is called if
+ *            it is installed and if all conditions are fulfiled.
+ *
+ * Arguments: In : uart: Pointer on the UART structure.
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+
+static void
+check_v24_input_lines (t_uart *uart)
+{
+    SYS_BOOL v24_input_line_changed;
+    volatile SYS_UWORD8 modem_status;
+
+    modem_status = READ_UART_REGISTER (uart, MSR);
+    v24_input_line_changed = 0;
+
+    if (modem_status & DELTA_CTS) {
+
+        v24_input_line_changed = 1;
+
+        if (modem_status & MCTS)
+            uart->cts_level = 0;
+        else
+            uart->cts_level = 1;
+    }
+
+    /*
+     * When the hardware flow control is selected, if the RS 232 input signal is
+     * deactivated (low), the transmitter is stopped.
+     */
+
+    if (uart->flow_control_mode == fc_rts) {
+        
+        if (uart->cts_level)
+            uart->tx_stopped_by_driver = 1;
+
+        else {
+            
+            uart->tx_stopped_by_driver = 0;
+
+            /*
+             * Disable sleep mode then unmask Tx interrupt.
+             */
+          
+            WRITE_UART_REGISTER (
+                uart, IER, READ_UART_REGISTER (uart, IER) & ~IER_SLEEP);
+
+            WRITE_UART_REGISTER (
+                uart, IER, READ_UART_REGISTER (uart, IER) | ETBEI);
+
+        }
+    }
+
+    if (v24_input_line_changed)
+        (void) NU_Activate_HISR (&(uart->v24_hisr_ctrl_block));
+}
+
+/*******************************************************************************
+ *
+ *                              fill_tx_fifo
+ * 
+ * Purpose  : If the TX buffer is not empty, and if there is no break in
+ *            progress, bytes are written into the TX FIFO until the TX FIFO is
+ *            full or the TX buffer is empty. Else, if there is a break to send
+ *            an all 0s character is written into the TX FIFO and a break is
+ *            declared in progress to avoid to fill the TX FIFO on the next
+ *            interrupt.
+ *            When the TX FIFO is empty and if a break is in progress, the break
+ *            length is programmed: all 0s characters are written into the TX
+ *            FIFO. The number of bytes has been defined previously with the
+ *            UAF_SetLineState function. The break condition is enabled.
+ *            When the TX FIFO and the transmitter shift register (TSR) are both
+ *            empty and if a break is in progress, the break condition is 
+ *            disabled.
+ *            When bytes are written from the TX buffer to the TX FIFO, the
+ *            writing callback function is called if it is installed and if all
+ *            conditions are fulfiled.
+ *
+ * Arguments: In : uart: Pointer on the UART structure.
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+
+static void
+fill_tx_fifo (t_uart *uart)
+{
+
+    /*
+     * Disable sleep mode then mask Tx interrupt.
+     */
+
+    WRITE_UART_REGISTER (
+        uart, IER, READ_UART_REGISTER (uart, IER) & ~IER_SLEEP);
+
+    WRITE_UART_REGISTER (
+        uart, IER, READ_UART_REGISTER (uart, IER) & ~ETBEI);
+
+    /*
+     * If a break is in progress, bytes of the TX buffer are not written into
+     * the TX FIFO.
+     */
+
+    if (!uart->break_in_progress)
+        (void) NU_Activate_HISR (&(uart->tx_hisr_ctrl_block));    
+
+    else {
+
+        /*
+         * The break HISR is activated and the break condition is cleared.
+         */
+
+        WRITE_UART_REGISTER (
+            uart, LCR, READ_UART_REGISTER (uart, LCR) & ~BREAK_CONTROL);
+
+        (void) NU_Activate_HISR (&(uart->break_hisr_ctrl_block));
+    }
+}
+
+/*******************************************************************************
+ *
+ *                                UAF_Init
+ * 
+ * Purpose  : Initializes the UART hardware and installs interrupt handlers.
+ *            The parameters are set to the default values:
+ *               - 19200 baud,
+ *               - 8 bits / character,
+ *               - no parity,
+ *               - 1 stop bit,
+ *               - no flow control.
+ *            All functionalities of the UART driver are disabled.
+ *
+ * Arguments: In : uartNo: Used UART.
+ *            Out: none
+ *
+ * Returns  : FD_OK           : Successful operation.
+ *            FD_NOT_SUPPORTED: Wrong UART number.
+ *            FD_INTERNAL_ERR : Internal problem.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_Init (T_fd_UartId uartNo)
+{
+    t_uart *uart;
+    volatile SYS_UWORD8 status;
+    int    index;
+
+#if ((CHIPSET == 2) || (CHIPSET == 3) || (CHIPSET == 4))
+    /*
+     * Check UART number.
+     * A return is used to simplify the code.
+     * UART IrDA (UAF_UART_0) can't be used for F&D on Ulysse because hardware
+     * flow control is not supported.
+     * DCD and DTR are not supported on UART Irda on C-Sample.
+     */
+
+    if ( (uartNo != UAF_UART_1) && (uartNo != UAF_UART_0) )
+        return (FD_NOT_SUPPORTED);
+#endif
+
+    for (index = 0; index < NUMBER_OF_FD_UART; index++)
+        uart_parameters[index].base_address = base_address[index];
+    
+
+    uart = &(uart_parameters[uartNo]);
+
+    /*
+     * Create the 3 HISR actived in the RX/TX and V24 interrupt handlers.
+     * A return is used to simplify the code if an error occurs.
+     * All stacks are entirely filled with the pattern 0xFE.
+     */
+	
+	if (uart_initialized==0){
+		        memset (&(uart->rx_hisr_stack[0]), 0xFE, RX_HISR_STACK_SIZE);
+                memset (&(uart->tx_hisr_stack[0]), 0xFE, TX_HISR_STACK_SIZE);
+                memset (&(uart->v24_hisr_stack[0]), 0xFE, V24_HISR_STACK_SIZE);
+                memset (&(uart->break_hisr_stack[0]), 0xFE, BREAK_HISR_STACK_SIZE);
+	uart_initialized = 1;
+	}
+     
+
+    if (NU_Create_HISR (&(uart->rx_hisr_ctrl_block),
+                        "Rx",
+                        hisr_execute_rx_tab[uartNo],
+                        RX_HISR_PRIORITY,
+                        &(uart->rx_hisr_stack[0]),
+                        RX_HISR_STACK_SIZE) != NU_SUCCESS)
+
+        return (FD_INTERNAL_ERR);
+
+    if (NU_Create_HISR (&(uart->tx_hisr_ctrl_block),
+                        "Tx",
+                        hisr_execute_tx_tab[uartNo],
+                        TX_HISR_PRIORITY,
+                        &(uart->tx_hisr_stack[0]),
+                        TX_HISR_STACK_SIZE) != NU_SUCCESS)
+
+        return (FD_INTERNAL_ERR);
+
+       if (NU_Create_HISR (&(uart->v24_hisr_ctrl_block),
+                        "UAF_V24",
+                        hisr_execute_v24_tab[uartNo],
+                        V24_HISR_PRIORITY,
+                        &(uart->v24_hisr_stack[0]),
+                        V24_HISR_STACK_SIZE) != NU_SUCCESS)
+
+        return (FD_INTERNAL_ERR);
+
+    /*
+     * Create the HISR used to send a break.
+     * A return is used to simplify the code if an error occurs.
+     * The stack is entirely filled with the pattern 0xFE.
+     */
+
+        if (NU_Create_HISR (&(uart->break_hisr_ctrl_block),
+                        "UAF_Brk",
+                        hisr_start_break_tab[uartNo],
+                        BREAK_HISR_PRIORITY,
+                        &(uart->break_hisr_stack[0]),
+                        BREAK_HISR_STACK_SIZE) != NU_SUCCESS)
+
+        return (FD_INTERNAL_ERR);
+
+    /*
+     * Create a timer used in the break HISR.
+     * A return is used to simplify the code if an error occurs.
+     */
+
+    if (NU_Create_Timer (&(uart->break_timer_ctrl_block),
+                         "Break",
+                         stop_break_tab[uartNo],
+                         0, /* Parameter supplied to the routine: not used. */
+                         0, /* This parameter is set when the timer is reset. */
+                         0, /* The timer expires once. */
+                         NU_DISABLE_TIMER) != NU_SUCCESS)
+
+        return (FD_INTERNAL_ERR);
+
+    /*
+     * Create a timer used in the detection of the escape sequence.
+     * A return is used to simplify the code if an error occurs.
+     */
+
+    if (NU_Create_Timer (&(uart->guard_period_timer_ctrl_block),
+                         "Esc seq",
+                         analyze_guard_period_timer_expiration_tab[uartNo],
+                         0, /* Parameter supplied to the routine: not used. */
+                         0, /* This parameter is set when the timer is reset. */
+                         0, /* The timer expires once. */
+                         NU_DISABLE_TIMER) != NU_SUCCESS)
+
+        return (FD_INTERNAL_ERR);
+
+    /*
+     * These data are used to send a break.
+     * A character has: 8 data bits + 1 start bit + 1 stop bit = 10 bits.
+     */
+
+    uart->baudrate = baudrate_value[FD_BAUD_115200];
+    uart->bits_per_char = 10;
+
+    /*
+     * UART base address.
+     */
+
+    uart->base_address = base_address[uartNo];
+
+    /*
+     * Select the current array used to store received bytes.
+     */
+     
+    uart->rx_buffer_used_by_rx_lisr = &(uart->rx_fifo_byte_2[0]);
+    uart->rx_buffer_used_by_rx_hisr = &(uart->rx_fifo_byte_2[0]);
+    
+    /*
+     * RX and TX buffers.
+     */
+
+    uart->buffer_size        = FD_MAX_BUFFER_SIZE;
+    uart->rx_threshold_level = 1;
+    uart->tx_threshold_level = 0;
+    uart->rx_in              = &(uart->rx_buffer[0]);
+    uart->rx_out             = &(uart->rx_buffer[0]);
+    uart->tx_in              = &(uart->tx_buffer[0]);
+    uart->tx_out             = &(uart->tx_buffer[0]);
+
+    /*
+     * Escape sequence.
+     */
+
+    uart->esc_seq_modified        = 0;
+    uart->esc_seq_detection_state = INITIALIZATION;
+    uart->esc_seq_character       = DEFAULT_ESC_SEQ_CHARACTER;
+    uart->guard_period            = CONVERT_TIME_IN_TDMA (
+                                         DEFAULT_GUARD_PERIOD);
+
+    /*
+     * Flow control.
+     */
+
+    uart->flow_control_mode         = fc_none;
+    uart->send_xon_xoff             = 0;
+    uart->rx_stopped_by_application = 1;
+    uart->rx_stopped_by_driver      = 0;
+    uart->tx_stopped_by_application = 1;
+    uart->tx_stopped_by_driver      = 0;
+
+    /*
+     * Break.
+     */
+
+    uart->break_received    = 0;
+    uart->break_to_send     = 0;
+    uart->break_in_progress = 0;
+
+    /*
+     * Callback (UAF_ReadData and UAF_WriteData).
+     */
+
+    uart->esc_seq_received  = 0;
+
+    uart->reading_suspended             = 0;
+    uart->writing_suspended             = 0;
+    uart->rd_call_from_hisr_in_progress = 0;
+    uart->wr_call_from_hisr_in_progress = 0;
+    uart->rd_call_setup                 = rm_noInstall;
+    uart->wr_call_setup                 = rm_noInstall;
+
+    /*
+     * State defined in UAF_GetLineState.
+     */
+
+    uart->state_1 = 0;
+    uart->state_2 = 0;
+    uart->state   = &(uart->state_1);
+
+    /*
+     * Errors counters.
+     */
+
+    uart->framing_error       = 0;
+    uart->parity_error        = 0;
+    uart->overrun_error       = 0;
+    uart->spurious_interrupts = 0;
+
+    uart->max_rx_fifo_level   = 0;
+
+    /*
+     * Mask all interrupts causes and disable sleep mode and low power mode.
+     */
+
+    WRITE_UART_REGISTER (uart, IER, 0x00);
+
+    /*
+     * Reset UART mode configuration.
+     */
+     
+    WRITE_UART_REGISTER (uart, MDR1, RESET_DEFAULT_STATE   |
+                                     IR_SLEEP_DISABLED     |
+                                     SIR_TX_WITHOUT_ACREG2 |
+                                     FRAME_LENGTH_METHOD);
+
+    /*
+     * FIFO configuration.
+     * EFR[4] = 1 to allow to program FCR[5:4] and MCR[7:5].
+     */
+     
+    WRITE_UART_REGISTER (uart, LCR, 0xBF);
+    SET_BIT (uart, EFR, ENHANCED_FEATURE_BIT);
+
+    /*
+     * Select the word length, the number of stop bits , the parity and set
+     * LCR[7] (DLAB) to allow to program FCR, DLL and DLM.
+     */
+
+    WRITE_UART_REGISTER (uart, LCR, WLS_8 | DLAB);
+
+    /*
+     * Program the trigger levels.
+     * MCR[6] must be set to 1.
+     */
+     
+    SET_BIT (uart, MCR, TCR_TLR_BIT);
+    WRITE_UART_REGISTER (uart, TCR, 0x0F);
+    WRITE_UART_REGISTER (uart, TLR, RX_FIFO_TRIGGER_LEVEL);
+    RESET_BIT (uart, MCR, TCR_TLR_BIT);
+
+    /*
+     * Force the generation of THR_IT on TX FIFO empty: SCR[3] = 1.
+     */
+
+    WRITE_UART_REGISTER (
+        uart, SCR, READ_UART_REGISTER (uart, SCR) | TX_EMPTY_CTL_IT);
+    
+    /*
+     * Program the FIFO control register. Bit 0 must be set when other FCR bits
+     * are written to or they are not programmed.
+     * FCR is a write-only register. It will not be modified.
+     */
+
+    WRITE_UART_REGISTER (uart, FCR, FIFO_ENABLE   |
+                                    RX_FIFO_RESET | /* self cleared */
+                                    TX_FIFO_RESET); /* self cleared */
+
+    /*
+     * Program the baud generator.
+     */
+
+    WRITE_UART_REGISTER (uart, DLL, dll[FD_BAUD_115200]);
+    WRITE_UART_REGISTER (uart, DLM, dlh[FD_BAUD_115200]);
+
+    /*
+     * Reset LCR[7] (DLAB) to have access to the RBR, THR and IER registers.
+     */
+
+    WRITE_UART_REGISTER (uart, LCR, READ_UART_REGISTER (uart, LCR) & ~DLAB);
+
+    /*
+     * Select UART mode.
+     */
+     
+    WRITE_UART_REGISTER (uart, MDR1, UART_MODE             |
+                                     IR_SLEEP_DISABLED     |
+                                     SIR_TX_WITHOUT_ACREG2 |
+                                     FRAME_LENGTH_METHOD);
+
+    /*
+     * Read the state of CTS, DSR and DCD.
+     */
+
+    status = READ_UART_REGISTER (uart, MSR);
+
+    if (status & MCTS)
+        uart->cts_level = 0;
+    else
+        uart->cts_level = 1;
+
+    /*
+     * Unmask RX interrupt and the modem status interrupt.
+     */
+
+    WRITE_UART_REGISTER (uart, IER, ERBI | EDSSI);
+
+    return (FD_OK);
+}
+
+/*******************************************************************************
+ *
+ *                               UAF_Enable
+ * 
+ * Purpose  : The functionalities of the UART driver are disabled or enabled.
+ *            In the deactivated state, all information about the communication
+ *            parameters should be stored and recalled if the driver is again
+ *            enabled. When the driver is enabled the RX and TX buffers are
+ *            cleared.
+ *
+ * Arguments: In : enable: 1: enable the driver
+ *                         0: disable the driver
+ *            Out: none
+ *
+ * Returns  : FD_OK           : Successful operation.
+ *            FD_INTERNAL_ERR : Internal problem with the hardware.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_Enable (T_fd_UartId uartNo, SYS_BOOL enable)
+{
+    t_uart  *uart;
+
+    /*
+     * There is no case where FD_INTERNAL_ERR may be returned.
+     */
+     
+    uart = &(uart_parameters[uartNo]);
+
+    if (enable) {
+
+        uart->rx_stopped_by_driver = 0;
+            
+        ENABLE_DRIVER (uart);
+        start_receiver (uart);
+
+    } else {
+
+        DISABLE_DRIVER (uart);
+        stop_receiver (uart);
+
+        uart->tx_in = &(uart->tx_buffer[0]);
+        uart->rx_in = &(uart->rx_buffer[0]);
+        uart->tx_out = uart->tx_in;
+        uart->rx_out = uart->rx_in;
+    }
+
+    return (FD_OK);
+}
+
+/*******************************************************************************
+ *
+ *                            UAF_SetComPar
+ * 
+ * Purpose  : Sets up the communication parameters: baud rate, bits per
+ *            character, number of stop bits, parity.
+ *
+ * Arguments: In : baudrate: Used baud rate.
+ *                 bpc     : Used bits per character.
+ *                 sb      : Used stop bits.
+ *                 parity  : Used parity.
+ *            Out: none
+ *
+ * Returns  : FD_OK           : Successful operation.
+ *            FD_NOT_SUPPORTED: The specified parameters don't fit to the
+ *                              capabilities of the UART.
+ *            FD_INTERNAL_ERR : Internal problem with the hardware.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_SetComPar (T_fd_UartId uartNo,
+               T_baudrate baudrate,
+               T_bitsPerCharacter bpc,
+               T_stopBits sb,
+               T_parity parity)
+{
+    t_uart *uart;
+    volatile SYS_UWORD8 mcr_value;
+    volatile SYS_UWORD8 status;
+
+    /*
+     * There is no case where FD_INTERNAL_ERR may be returned.
+     * pa_space is not supported. Some baudrates are not supported too.
+     * A return is used to simplify the code.
+     */
+       baudrate = FD_BAUD_115200;
+
+    if ((!baudrate_value[baudrate]) ||
+        (parity == pa_space))
+
+        return (FD_NOT_SUPPORTED);
+
+    uart = &(uart_parameters[uartNo]);
+
+    /*
+     * Mask all interrupts causes and disable sleep mode and low power mode.
+     */
+
+    WRITE_UART_REGISTER (uart, IER, 0x00);
+
+    /*
+     * Reset UART mode configuration.
+     */
+     
+    WRITE_UART_REGISTER (uart, MDR1, RESET_DEFAULT_STATE   |
+                                     IR_SLEEP_DISABLED     |
+                                     SIR_TX_WITHOUT_ACREG2 |
+                                     FRAME_LENGTH_METHOD);
+
+    /*
+     * FIFO configuration.
+     * EFR[4] = 1 to allow to program FCR[5:4] and MCR[7:5].
+     */
+     
+    WRITE_UART_REGISTER (uart, LCR, 0xBF);
+    SET_BIT (uart, EFR, ENHANCED_FEATURE_BIT);
+
+    /*
+     * Select the word length, the number of stop bits , the parity and set
+     * LCR[7] (DLAB) to allow to program FCR, DLL and DLM.
+     */
+
+    uart->baudrate = baudrate_value[baudrate];
+    uart->bits_per_char = 1; /* Start bit. */
+    mcr_value = DLAB;
+
+    if (bpc == bpc_7) {
+    
+        mcr_value |= WLS_7;
+        uart->bits_per_char += 7;
+
+    } else {
+
+        mcr_value |= WLS_8;
+        uart->bits_per_char += 8;
+    }
+
+    if (sb == sb_2) {
+
+        mcr_value |= STB;
+        uart->bits_per_char += 2;
+
+    } else
+        uart->bits_per_char += 1;
+
+    switch (parity) {
+
+    case pa_even:
+
+        mcr_value |= (PEN | EPS);
+        uart->bits_per_char += 1;
+
+        break;
+
+    case pa_odd:
+
+        mcr_value |= PEN;
+        uart->bits_per_char += 1;
+
+        break;
+
+    default:
+
+        /*
+         * There is nothing to do.
+         */
+
+        break;
+    }
+
+    WRITE_UART_REGISTER (uart, LCR, mcr_value);
+
+    /*
+     * Program the trigger levels.
+     * MCR[6] must be set to 1.
+     */
+     
+    SET_BIT (uart, MCR, TCR_TLR_BIT);
+    WRITE_UART_REGISTER (uart, TCR, 0x0F);
+    WRITE_UART_REGISTER (
+        uart, TLR, RX_FIFO_TRIGGER_LEVEL);
+    RESET_BIT (uart, MCR, TCR_TLR_BIT);
+
+    /*
+     * Force the generation of THR_IT on TX FIFO empty: SCR[3] = 1.
+     */
+
+    WRITE_UART_REGISTER (
+        uart, SCR, READ_UART_REGISTER (uart, SCR) | TX_EMPTY_CTL_IT);
+    
+    /*
+     * Program the FIFO control register. Bit 0 must be set when other FCR bits
+     * are written to or they are not programmed.
+     * FCR is a write-only register. It will not be modified.
+     */
+
+    WRITE_UART_REGISTER (uart, FCR, FIFO_ENABLE   |
+                                    RX_FIFO_RESET | /* self cleared */
+                                    TX_FIFO_RESET); /* self cleared */
+
+    /*
+     * Program the baud generator.
+     */
+
+    WRITE_UART_REGISTER (uart, DLL, dll[baudrate]);
+    WRITE_UART_REGISTER (uart, DLM, dlh[baudrate]);
+
+    /*
+     * Reset LCR[7] (DLAB) to have access to the RBR, THR and IER registers.
+     */
+
+    WRITE_UART_REGISTER (uart, LCR, READ_UART_REGISTER (uart, LCR) & ~DLAB);
+
+    /*
+     * Select UART mode.
+     */
+     
+    WRITE_UART_REGISTER (uart, MDR1, UART_MODE             |
+                                     IR_SLEEP_DISABLED     |
+                                     SIR_TX_WITHOUT_ACREG2 |
+                                     FRAME_LENGTH_METHOD);
+
+    /*
+     * Read the state of CTS, DSR and DCD.
+     */
+
+    status = READ_UART_REGISTER (uart, MSR);
+
+    if (status & MCTS)
+        uart->cts_level = 0;
+    else
+        uart->cts_level = 1;
+
+    /*
+     * Unmask RX and TX interrupts and the modem status interrupt 
+     * and allow sleep mode.
+     */
+
+    WRITE_UART_REGISTER (uart, IER, ERBI | ETBEI | EDSSI | IER_SLEEP);
+    WRITE_UART_REGISTER (uart, IER, ERBI | ETBEI | EDSSI);
+
+    return (FD_OK);
+}
+
+/*******************************************************************************
+ *
+ *                            UAF_SetBuffer
+ * 
+ * Purpose  : Sets up the size of the circular buffers to be used in the UART
+ *            driver. This function may be called only if the UART is disabled
+ *            with UAF_Enable.
+ *
+ * Arguments: In : bufSize    : Specifies the size of the circular buffer.
+ *                 rxThreshold: Amount of received bytes that leads to a call
+ *                              to suspended read-out function which is passed
+ *                              to the function UAF_ReadData.
+ *                 txThreshold: Amount of bytes in the TX buffer to call the
+ *                              suspended write-in function which is passed to
+ *                              the function UAF_WriteData
+ *            Out: none
+ *
+ * Returns  : FD_OK           : Successful operation.
+ *            FD_NOT_SUPPORTED: bufSize exceeds the maximal possible
+ *                              capabilities of the driver or the threshold
+ *                              values don't correspond to the bufSize.
+ *            FD_INTERNAL_ERR : Internal problem with the hardware or the
+ *                              function has been called while the UART is
+ *                              enabled.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_SetBuffer (T_fd_UartId uartNo,
+               SYS_UWORD16 bufSize,
+               SYS_UWORD16 rxThreshold,
+               SYS_UWORD16 txThreshold)
+{
+    T_FDRET result;
+    t_uart *uart;
+
+    if ((bufSize > FD_MAX_BUFFER_SIZE) ||
+        (rxThreshold > FD_MAX_BUFFER_SIZE) ||
+        (txThreshold > FD_MAX_BUFFER_SIZE))
+
+        result = FD_NOT_SUPPORTED;
+
+    else {
+    
+        uart = &(uart_parameters[uartNo]);
+        
+        if (!DRIVER_DISABLED (uart))
+            result = FD_INTERNAL_ERR;
+
+        else if (RX_HIGH_WATERMARK (bufSize) < RX_LOW_WATERMARK (bufSize))
+            result = FD_NOT_SUPPORTED;
+
+        else {
+        
+            uart->buffer_size = bufSize;
+            uart->rx_threshold_level = rxThreshold;
+            uart->tx_threshold_level = txThreshold;
+
+            result = FD_OK;
+        }
+    }
+
+    return (result);
+}
+
+/*******************************************************************************
+ *
+ *                             UAF_SetFlowCtrl
+ * 
+ * Purpose  : Changes the flow control mode of the UART driver.
+ *            If a flow control is activated, DTR is activated or XOFF is sent
+ *            if the RX buffer is not able to store the received characters else
+ *            DTR is deactivated or XON is sent.
+ *
+ * Arguments: In : fcMode: flow control mode (none, DTR/DSR, RTS/CTS, XON/XOFF).
+ *                 XON   : ASCII code of the XON character.
+ *                 XOFF  : ASCII code of the XOFF character.
+ *            Out: none
+ *
+ * Returns  : FD_OK           : Successful operation.
+ *            FD_NOT_SUPPORTED: The flow control mode is not supported.
+ *            FD_INTERNAL_ERR : Internal problem with the hardware.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_SetFlowCtrl (T_fd_UartId uartNo,
+                 T_flowCtrlMode fcMode,
+                 SYS_UWORD8 XON,
+                 SYS_UWORD8 XOFF)
+{
+    T_FDRET result;
+    t_uart  *uart;
+
+    /*
+     * There is no case where FD_INTERNAL_ERR may be returned.
+     * The DTR/DSR protocol is not supported.
+     */
+
+    if (fcMode == fc_dtr)
+        result = FD_NOT_SUPPORTED;
+
+    else {
+    
+        uart = &(uart_parameters[uartNo]);
+
+        uart->tx_stopped_by_driver = 0;
+
+        
+        uart->xon_character = XON;
+        uart->xoff_character = XOFF;
+        uart->flow_control_mode = fcMode;
+
+        /*
+         * Disable sleep mode.
+         */
+
+        WRITE_UART_REGISTER (
+            uart, IER, READ_UART_REGISTER (uart, IER) & ~IER_SLEEP);
+
+        WRITE_UART_REGISTER (
+            uart, MCR, READ_UART_REGISTER (uart, MCR) | MRTS);
+          
+        /*
+         * Re-enable sleep mode.
+         */
+
+        WRITE_UART_REGISTER (
+            uart, IER, READ_UART_REGISTER (uart, IER) | IER_SLEEP);
+        
+        if (fcMode == fc_rts) {
+
+            if (uart->cts_level)
+                uart->tx_stopped_by_driver = 1;
+        }
+
+        /*
+         * If the high watermark is reached, DTR or RTS is activated or XOFF is
+         * sent according to the flow control mode. Else, DTR is deactivated or
+         * XON is sent.
+         */
+
+        if (fcMode != fc_none) {
+
+            if (get_bytes_in_rx_buffer (uart) >= RX_HIGH_WATERMARK (
+                                                     uart->buffer_size)) {
+
+                uart->rx_stopped_by_driver = 1;
+                stop_receiver (uart);
+
+            } else if (!DRIVER_DISABLED (uart)) {
+
+                uart->rx_stopped_by_driver = 0;
+                start_receiver (uart);
+            }
+            
+        } else {
+        
+            uart->rx_stopped_by_driver = 0;
+            uart->tx_stopped_by_driver = 0;
+        }
+
+        result = FD_OK;
+    }
+
+    return (result);
+}
+
+/*******************************************************************************
+ *
+ *                               UAF_SetEscape
+ * 
+ * Purpose  : To return to the command mode at the ACI while a data connection
+ *            is established, an escape sequence has to be detected.
+ *            To distinguish between user data and the escape sequence a
+ *            defined guard period is necessary before and after this sequence.
+ *
+ * Arguments: In : escChar    : ASCII character which could appear three times
+ *                              as an escape sequence.
+ *                 guardPeriod: Denotes the minimal duration of the rest before
+ *                              the first and after the last character of the
+ *                              escape sequence, and the maximal receiving
+ *                              duration of the whole escape string. This value
+ *                              is expressed in ms.
+ *            Out: none
+ *
+ * Returns  : FD_OK           : Successful operation.
+ *            FD_INTERNAL_ERR : Internal problem with the hardware.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_SetEscape (T_fd_UartId uartNo,
+               SYS_UWORD8 escChar,
+               SYS_UWORD16 guardPeriod)
+{
+    t_uart  *uart;
+
+    /*
+     * There is no case where FD_INTERNAL_ERR may be returned.
+     */
+
+    uart = &(uart_parameters[uartNo]);
+
+    uart->esc_seq_modified = 1;
+    uart->esc_seq_character = escChar;
+    uart->guard_period = CONVERT_TIME_IN_TDMA ((UNSIGNED) guardPeriod);
+    uart->esc_seq_modified = 0; /* Set to 0 by the RX interrupt handler. */
+
+    return (FD_OK);
+}
+
+/*******************************************************************************
+ *
+ *                              UAF_InpAvail
+ * 
+ * Purpose  : Returns the number of characters available in the RX buffer of the
+ *            driver. If the driver is disabled the function returns 0.
+ *
+ * Arguments: In : none
+ *            Out: none
+ *
+ * Returns  : >= 0            : The returned value is the amount of data in the
+ *                              RX buffer.
+ *            FD_NOT_READY    : The function is called while the callback of the
+ *                              readOutFunc function is activated and still not
+ *                              terminated.
+ *            FD_INTERNAL_ERR : Internal problem with the hardware.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_InpAvail (T_fd_UartId uartNo)
+{
+    T_FDRET result;
+    t_uart  *uart;
+    SYS_UWORD16  bytes_read;
+    SYS_UWORD16  bytes_in_rx_buffer;
+
+    /*
+     * There is no case where FD_INTERNAL_ERR may be returned.
+     */
+
+    uart = &(uart_parameters[uartNo]);
+
+    if (uart->rd_call_setup == rm_notDefined)
+        result = FD_NOT_READY;
+
+    else if (DRIVER_DISABLED (uart))
+        result = 0;
+
+    else {
+
+        bytes_in_rx_buffer = get_bytes_in_rx_buffer (uart);
+
+        /*
+         * Update reading pointer of the RX buffer if a callback from LISR
+         * has been done.
+         */
+
+        if (uart->rd_call_from_hisr_in_progress) {
+
+            bytes_read = uart->rd_size_before_call[0] -
+                         uart->rd_size_after_call[0] +
+                         uart->rd_size_before_call[1] -
+                         uart->rd_size_after_call[1];
+
+            uart->rx_out += bytes_read;
+
+            if (uart->rx_out >= &(uart->rx_buffer[0]) + uart->buffer_size + 1)
+                uart->rx_out = uart->rx_out - uart->buffer_size - 1;
+
+            /*
+             * Check if the low watermark is reached to enable the receiver.
+             */
+
+            bytes_in_rx_buffer = get_bytes_in_rx_buffer (uart);
+
+            if ((uart->flow_control_mode != fc_none) &&
+                 (bytes_in_rx_buffer <= RX_LOW_WATERMARK (uart->buffer_size))) {
+
+                if ((!uart->rx_stopped_by_application) &&
+                    uart->rx_stopped_by_driver)
+                start_receiver (uart);
+
+                uart->rx_stopped_by_driver = 0;
+            }
+
+            uart->rd_call_from_hisr_in_progress = 0;
+        }
+
+        result = (T_FDRET) bytes_in_rx_buffer;
+    }
+
+    return (result);
+}
+
+/*******************************************************************************
+ *
+ *                             UAF_OutpAvail
+ * 
+ * Purpose  : Returns the number of free characters in TX buffer of the driver.
+ *            If the driver is disabled the function returns 0.
+ *
+ * Arguments: In : none
+ *            Out: none
+ *
+ * Returns  : >= 0            : The returned value is the amount of data in the
+ *                              TX buffer.
+ *            FD_NOT_READY    : The function is called while the callback of the
+ *                              writeInFunc function is activated and still not
+ *                              terminated.
+ *            FD_INTERNAL_ERR : Internal problem with the hardware.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_OutpAvail (T_fd_UartId uartNo)
+{
+    T_FDRET result;
+    t_uart  *uart;
+    SYS_UWORD16  bytes_written;
+
+    /*
+     * There is no case where FD_INTERNAL_ERR may be returned.
+     */
+
+    uart = &(uart_parameters[uartNo]);
+
+    if (uart->wr_call_setup == rm_notDefined)
+        result = FD_NOT_READY;
+
+    else if (DRIVER_DISABLED (uart))
+        result = 0;
+
+    else {
+
+        /*
+         * Update reading pointer of the TX buffer if a callback from LISR
+         * has been done.
+         */
+
+        if (uart->wr_call_from_hisr_in_progress) {
+
+            bytes_written = uart->wr_size_before_call[0] -
+                            uart->wr_size_after_call[0] +
+                            uart->wr_size_before_call[1] -
+                            uart->wr_size_after_call[1];
+
+            uart->tx_in += bytes_written;
+
+            if (uart->tx_in >= &(uart->tx_buffer[0]) + uart->buffer_size + 1)
+                uart->tx_in = uart->tx_in - uart->buffer_size - 1;
+
+            uart->wr_call_from_hisr_in_progress = 0;
+
+            /*
+             * if the TX FIFO is empty, unmask TX empty interrupt.
+             */
+
+            if (!uart->tx_stopped_by_driver &&
+                (READ_UART_REGISTER (uart, LSR) & THRE))
+            {
+                /*
+                 * Disable sleep mode then unmask Tx interrupt.
+                 */
+          
+                WRITE_UART_REGISTER (
+                   uart, IER, READ_UART_REGISTER (uart, IER) & ~IER_SLEEP);
+
+                WRITE_UART_REGISTER (
+                    uart, IER, READ_UART_REGISTER (uart, IER) | ETBEI);
+        }
+        }
+
+        result = (T_FDRET) (uart->buffer_size - get_bytes_in_tx_buffer (uart));
+    }
+
+    return (result);
+}
+
+/*******************************************************************************
+ *
+ *                             UAF_EnterSleep
+ * 
+ * Purpose  : Checks if UART is ready to enter Deep Sleep. If ready, enables
+ *            wake-up interrupt.
+ *
+ * Arguments: In : none
+ *            Out: none
+ *
+ * Returns: 0	 : Deep Sleep is not possible.
+ *          >= 1 : Deep Sleep is possible.
+ *
+ * Warning: Parameters are not verified.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_EnterSleep (T_fd_UartId uartNo)
+{
+    t_uart              *uart;
+    SYS_BOOL            deep_sleep;
+    volatile SYS_UWORD8 status;
+    
+    uart = &(uart_parameters[uartNo]);
+    deep_sleep = 0;
+
+    /*
+	 * Check if RX & TX FIFOs are both empty
+	 */
+
+    status = READ_UART_REGISTER (uart, LSR);
+
+    if (!(status & DR) &&
+        (status & TEMT)) {
+
+        /*
+         * Disable sleep mode.
+         */
+              
+        WRITE_UART_REGISTER (
+            uart, IER, READ_UART_REGISTER (uart, IER) & ~IER_SLEEP);
+
+        /*
+         * Mask RX, TX and the modem status interrupts.
+         */
+
+        WRITE_UART_REGISTER (
+            uart, IER, READ_UART_REGISTER (uart, IER) &
+                       ~(ERBI | ETBEI | EDSSI));
+
+        /*
+         * Enable the wake-up interrupt.
+         */
+
+        ENABLE_WAKEUP_INTERRUPT (uart);
+
+        deep_sleep = 1;
+    }
+
+    return (deep_sleep);
+}
+
+/*******************************************************************************
+ *
+ *                              UAF_WakeUp
+ * 
+ * Purpose  : Wakes up UART after Deep Sleep.
+ *
+ * Arguments: In : none
+ *            Out: none
+ *
+ * Returns: FD_OK : Successful operation.
+ *
+ * Warning: Parameters are not verified.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_WakeUp (T_fd_UartId uartNo)
+{
+    t_uart *uart;
+   
+    uart = &(uart_parameters[uartNo]);
+
+    /*
+     * Disable the wake-up interrupt.
+     */
+
+    DISABLE_WAKEUP_INTERRUPT (uart);
+
+    /*
+     * Unmask RX and modem status interrupts then allow sleep mode.
+     */
+
+    WRITE_UART_REGISTER (
+        uart, IER, READ_UART_REGISTER (uart, IER) | (ERBI | EDSSI));
+
+    WRITE_UART_REGISTER ( 
+        uart, IER, READ_UART_REGISTER (uart, IER) | IER_SLEEP);
+
+    return (FD_OK);
+}
+
+/*******************************************************************************
+ *
+ *                              UAF_ReadData
+ * 
+ * Purpose  : To read the received characters out of the RX buffer the address
+ *            of a function is passed. If characters are available, the driver
+ *            calls this function and pass the address and the amount of
+ *            readable characters. Because the RX buffer is circular, the
+ *            callback function may be called with more than one address of
+ *            buffer fragment.
+ *            The readOutFunc function modifies the contents  of the size array
+ *            to return the driver the number of processed characters. Each
+ *            array entry is decremented by the number of bytes read in the
+ *            fragment.
+ *            If the UAF_ReadData is called while the RX buffer is empty, it
+ *            depends on the suspend parameter to suspend the call-back or to
+ *            leave without any operation. In the case of suspension, the
+ *            return value of UAF_ReadData is UAF_SUSPENDED. A delayed call-back
+ *            will be performed if:
+ *              - the RX buffer reachs the adjusted threshold (rxThreshold of
+ *                UAF_SetBuffer),
+ *              - the state of a V.24 input line has changed,
+ *              - a break is detected,
+ *              - an escape sequence is detected.
+ *            If no suspension is necessary the function returns the number of
+ *            processed bytes.
+ *
+ * Arguments: In : suspend    : mode of suspension in case of RX buffer empty.
+ *                 readOutFunc: Callback function.
+ *                              cldFromIrq: The driver sets this parameter to 1
+ *                                          if the callback function is called
+ *                                          from an interrupt service routine.
+ *                              reInstall : The call-back function sets this
+ *                                          parameter to rm_reInstall if the
+ *                                          driver must call again the callback
+ *                                          function when the RX threshold level
+ *                                          is reached. Else it will be set to
+ *                                          rm_noInstall. Before to call the
+ *                                          readOutFunc function this parameter
+ *                                          is set to rm_notDefined.
+ *                              nsource   : Informed the callback function about
+ *                                          the number of fragments which are
+ *                                          ready to copy from the circular RX
+ *                                          buffer.
+ *                              source    : Array which contains the addresses
+ *                                          of the fragments.
+ *                              size      : Array which contains the sizes of
+ *                                          each fragments.
+ *                              state     : The state parameter is the status
+ *                                          of the V.24 lines and the break / 
+ *                                          escape detection. The state
+ *                                          parameter is described in the
+ *                                          specification of UAF_GetLineState.
+ *            Out: none
+ *
+ * Returns  : >= 0            : Succesful operation. Amount of processed bytes.
+ *            FD_SUSPENDED    : The callback is suspended until the buffer or
+ *                              state condition changed.
+ *            FD_NOT_READY    : The function is called while the callback is
+ *                              activated and still not terminated.
+ *            FD_INTERNAL_ERR : Internal problems with the hardware.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_ReadData (T_fd_UartId uartNo,
+              T_suspendMode suspend,
+              void (readOutFunc (SYS_BOOL cldFromIrq,
+                                 T_reInstMode *reInstall,
+                                 SYS_UWORD8 nsource,
+                                 SYS_UWORD8 *source[],
+                                 SYS_UWORD16 size[],
+                                 SYS_UWORD32 state)))
+{
+    T_FDRET result;
+    t_uart *uart;
+    SYS_UWORD16  bytes_read;
+    SYS_UWORD16  bytes_in_rx_buffer;
+
+    /*
+     * There is no case where FD_INTERNAL_ERR may be returned.
+     */
+
+    uart = &(uart_parameters[uartNo]);
+
+    if (uart->rd_call_setup == rm_notDefined)
+        result = FD_NOT_READY;
+
+    else if (get_bytes_in_rx_buffer (uart) || uart->esc_seq_received) {
+
+        uart->readOutFunc = readOutFunc;
+        update_reading_callback (uart, 0); /* 0: call from application. */
+
+        bytes_read = uart->rd_size_before_call[0] -
+                     uart->rd_size_after_call[0] +
+                     uart->rd_size_before_call[1] -
+                     uart->rd_size_after_call[1];
+
+        uart->rx_out += bytes_read;
+
+        if (uart->rx_out >= &(uart->rx_buffer[0]) + uart->buffer_size + 1)
+            uart->rx_out = uart->rx_out - uart->buffer_size - 1;
+
+        /*
+         * Check if the low watermark is reached to enable the receiver.
+         */
+
+        if ((uart->flow_control_mode != fc_none) &&
+            (get_bytes_in_rx_buffer (uart) <= RX_LOW_WATERMARK (
+                                                  uart->buffer_size))) {
+
+            if ((!uart->rx_stopped_by_application) &&
+                uart->rx_stopped_by_driver)
+            start_receiver (uart);
+
+            uart->rx_stopped_by_driver = 0;
+        }
+
+        uart->esc_seq_received = 0;
+        result = (T_FDRET) bytes_read;
+
+    } else  if (suspend == sm_suspend) {
+
+        uart->readOutFunc = readOutFunc;
+        uart->reading_suspended = 1;
+        result = FD_SUSPENDED;
+
+    } else {
+        
+        /*
+         * The previous callback function is deinstalled.
+         */
+             
+        uart->rd_call_setup = rm_noInstall;
+        uart->reading_suspended = 0;
+        result = 0; /* 0 byte read. */
+    }
+
+    return (result);
+}
+
+/*******************************************************************************
+ *
+ *                              UAF_WriteData
+ * 
+ * Purpose  : To write characters into the TX buffer the address of a function
+ *            is passed. If free space is available in the buffer, the driver
+ *            calls this function and passes the destination address and the
+ *            amount of space. Because the RX buffer is circular, the callback
+ *            function may be called with more than one address of buffer
+ *            fragment.
+ *            The writeInFunc function modifies the contents of the size array
+ *            to return the driver the number of processed bytes. Each array
+ *            entry is decremented  by the number of bytes written in this
+ *            fragment.
+ *            If the UAF_WriteData function is called while the TX buffer is
+ *            full, it depends on the suspend parameter to suspend the
+ *            call-back or to leave this function without any operation. In the
+ *            case of suspension the returned value of the UAF_WriteData is
+ *            UAF_SUSPENDED. A delayed call-back will be performed if the TX
+ *            buffer reaches the adjusted threshold (txThreshold of
+ *            UAF_SetBuffer). If no suspension is necessary the function returns
+ *            the number of processed bytes.
+ *
+ * Arguments: In : suspend    : mode of suspension in case of TX buffer empty.
+ *                 writeInFunc: Callback function. 
+ *                              cldFromIrq: The driver sets this parameter to 1
+ *                                          if the call-back function is called
+ *                                          from an interrupt service routine.
+ *                              reInstall : The callback function sets this
+ *                                          parameter to rm_reInstall if the
+ *                                          driver must call again the callback
+ *                                          function when the TX threshold level
+ *                                          is reached. Else it will be set to
+ *                                          rm_noInstall. Before to call the
+ *                                          readOutFunc function this parameter
+ *                                          is set to rm_notDefined.
+ *                              nsource   : Informed the callback function about
+ *                                          the number of fragments which are
+ *                                          available in the TX buffer.
+ *                              dest      : Array which contains the addresses
+ *                                          of the fragments.
+ *                              size      : Array which contains the sizes of
+ *                                          each fragments.
+ *            Out: none
+ *
+ * Returns  : >= 0            : Succesful operation. Amount of processed bytes.
+ *            FD_SUSPENDED    : The callback is suspended until the buffer
+ *                              condition changed.
+ *            FD_NOT_READY    : The function is called while the callback is
+ *                              activated and still not terminated.
+ *            FD_INTERNAL_ERR : Internal problems with the hardware.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_WriteData (T_fd_UartId uartNo,
+               T_suspendMode suspend,
+               void (writeInFunc (SYS_BOOL cldFromIrq,
+                                  T_reInstMode *reInstall,
+                                  SYS_UWORD8 ndest,
+                                  SYS_UWORD8 *dest[],
+                                  SYS_UWORD16 size[])))
+{
+    T_FDRET result;
+    t_uart *uart;
+    SYS_UWORD16  bytes_written;
+
+    /*
+     * There is no case where FD_INTERNAL_ERR may be returned.
+     */
+
+    uart = &(uart_parameters[uartNo]);
+
+    if (uart->wr_call_setup == rm_notDefined)
+        result = FD_NOT_READY;
+
+    else if ((!DRIVER_DISABLED (uart)) &&
+             (get_bytes_in_tx_buffer (uart) < uart->buffer_size)) {
+
+#if (BOARD == 31)
+	/*while ((*((volatile SYS_UWORD16 *) ARMIO_IN) & 0x0100) == 0x0000)
+	{
+		*((volatile SYS_UWORD16 *) ARMIO_OUT) &= ~(0x0040);
+	}*/
+	if ((*((volatile SYS_UWORD16 *) ARMIO_IN) & 0x0100) == 0x0000)
+	{
+		*((volatile SYS_UWORD16 *) ARMIO_OUT) &= ~(0x0040);
+		NU_Sleep(4);		// 1.84 ms
+	}
+	*((volatile SYS_UWORD16 *) ARMIO_OUT) |= 0x0040;
+
+#endif
+        uart->writeInFunc = writeInFunc;
+        update_writing_callback (uart, 0); /* 0: call from application. */
+
+        bytes_written = uart->wr_size_before_call[0] -
+                        uart->wr_size_after_call[0] +
+                        uart->wr_size_before_call[1] -
+                        uart->wr_size_after_call[1];
+
+        uart->tx_in += bytes_written;
+
+        if (uart->tx_in >= &(uart->tx_buffer[0]) + uart->buffer_size + 1)
+            uart->tx_in = uart->tx_in - uart->buffer_size - 1;
+
+        /*
+         * If:
+         *      - there is no break to send,
+         *      - the flow control is not activated,
+         * unmask the TX empty interrupt to be able to send characters.
+         */
+
+        if (!uart->break_to_send &&
+            !uart->tx_stopped_by_driver)
+        {    
+            /*
+             * Disable sleep mode then unmask Tx interrupt.
+             */
+          
+            WRITE_UART_REGISTER (
+                uart, IER, READ_UART_REGISTER (uart, IER) & ~IER_SLEEP);
+
+            WRITE_UART_REGISTER (
+                uart, IER, READ_UART_REGISTER (uart, IER) | ETBEI);
+        }
+
+        result = (T_FDRET) bytes_written;
+
+    } else  if (suspend == sm_suspend) {
+
+        uart->writeInFunc = writeInFunc;
+        uart->writing_suspended = 1;
+        result = FD_SUSPENDED;
+
+    } else {
+        
+        /*
+         * The previous callback function is deinstalled.
+         */
+             
+        uart->wr_call_setup = rm_noInstall;
+        uart->writing_suspended = 0;
+        result = 0;
+    }
+
+    return (result);
+}
+
+/*******************************************************************************
+ *
+ *                              UAF_StopRec
+ * 
+ * Purpose  : If a flow control mode is set, this function tells the terminal
+ *            equipment that no more data can be received.
+ *            XON/XOFF: XOFF is sent.
+ *            DTR/DSR : DTR is desactivated.
+ *            RTS/CTS : RTS is deactivated.
+ *
+ * Arguments: In : none
+ *            Out: none
+ *
+ * Returns  : FD_OK           : Successful operation.
+ *            FD_INTERNAL_ERR : Internal problem with the hardware.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_StopRec (T_fd_UartId uartNo)
+{
+    t_uart *uart;
+
+    /*
+     * There is no case where FD_INTERNAL_ERR may be returned.
+     */
+
+    uart = &(uart_parameters[uartNo]);
+
+    if (uart->flow_control_mode != fc_none)
+        stop_receiver (uart);
+
+    uart->rx_stopped_by_application = 1;
+
+    return (FD_OK);
+}
+
+/*******************************************************************************
+ *
+ *                              UAF_StartRec
+ * 
+ * Purpose  : If a flow control mode is set, this function tells the terminal
+ *            equipment that the receiver is again able to receive more data.
+ *            If the buffer has already reached the high water mark the driver
+ *            sends the signal only if the buffer drains to a low water mark.
+ *            XON/XOFF: XON is sent.
+ *            DTR/DSR : DTR is activated.
+ *            RTS/CTS : RTS is activated.
+ *
+ * Arguments: In : none
+ *            Out: none
+ *
+ * Returns  : FD_OK           : Successful operation.
+ *            FD_INTERNAL_ERR : Internal problem with the hardware.
+ *
+ ******************************************************************************/
+
+T_FDRET 
+UAF_StartRec (T_fd_UartId uartNo)
+{
+    t_uart *uart;
+
+    /*
+     * There is no case where FD_INTERNAL_ERR may be returned.
+     */
+
+    uart = &(uart_parameters[uartNo]);
+
+    if ((uart->flow_control_mode != fc_none) && (!uart->rx_stopped_by_driver))
+        start_receiver (uart);
+
+    uart->rx_stopped_by_application = 0;
+
+    return (FD_OK);
+}
+
+/*******************************************************************************
+ *
+ *                            UAF_GetLineState
+ * 
+ * Purpose  : Returns the state of the V.24 lines, the flow control state and
+ *            the resukt of the break/escape detection process as a bit field.
+ *
+ * Arguments: In : none
+ *            Out: state : State of the V.24 lines, the flow control state and
+ *                         the result of the break/escape sequence detection
+ *                         process as a bit field.
+ *
+ * Returns  : FD_OK           : Successful operation.
+ *            FD_NOT_READY    : The function is called while the callback of 
+ *                              the readOutFunc function is activated and still
+ *                              not terminated.
+ *            FD_INTERNAL_ERR : Internal problem with the hardware.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_GetLineState (T_fd_UartId uartNo, SYS_UWORD32 *state)
+{
+    T_FDRET result;
+    t_uart *uart;
+
+    /*
+     * There is no case where FD_INTERNAL_ERR may be returned.
+     * Signals not supported are reported as 0.
+     */
+
+    uart = &(uart_parameters[uartNo]);
+
+    if (uart->rd_call_setup == rm_notDefined)
+        result = FD_NOT_READY;
+
+    else {
+
+        /*
+         * The field state_2 is used when state_1 is set to 0 to avoid to
+         * lose events detected in the RX interrupt handler.
+         * Fields BRK and BRKLEN are set when a break is detected.
+         * The field ESC is set when an escape sequence is detected. 
+         */
+
+        *state = uart->state_2;
+        uart->state_2 = 0;
+        uart->state = &(uart->state_2);
+
+        *state |= uart->state_1;
+        uart->state_1 = 0;
+        uart->state = &(uart->state_1);
+
+        *state |= ((((SYS_UWORD32) uart->cts_level) << RTS) |
+
+                   (((SYS_UWORD32) (uart->tx_stopped_by_application |
+                              uart->tx_stopped_by_driver)) << TXSTP) |
+
+                   (((SYS_UWORD32) (uart->rx_stopped_by_application |
+                              uart->rx_stopped_by_driver)) << RXSTP) |
+
+                   (((SYS_UWORD32) (uart->buffer_size - 
+                              get_bytes_in_rx_buffer (uart))) << RXBLEV));
+                                 
+        /*
+         * Fields SA, SB and X are set according to the flow control:
+         *
+         *       None    RTS/CTS    XON/XOFF
+         * SA    0 (ns)  0 (ns)     0 (ns)
+         * SB    RTS     0          RTS
+         * X     0       RTS        XON:0 XOFF:1 (transmitter)
+         *
+         * ns: signal not supported.
+         * DTR/DSR flow control is not supported.
+         */
+
+        if (uart->flow_control_mode != fc_rts)
+            *state |= (((SYS_UWORD32) uart->cts_level) << SB);
+
+        if (uart->flow_control_mode == fc_rts)
+            *state |= (((SYS_UWORD32) uart->cts_level) << X);
+            
+        else if ((uart->flow_control_mode == fc_xoff) &&
+                 (uart->tx_stopped_by_application ||
+                  uart->tx_stopped_by_driver))
+            *state |= (1 << X);
+
+        result = FD_OK;
+    }
+
+    return (result);
+}
+
+/*******************************************************************************
+ *
+ *                            UAF_SetLineState
+ * 
+ * Purpose  : Sets the states of the V.24 status lines according to the bit
+ *            field of the parameter state.
+ *
+ * Arguments: In : state : Bit field. Only the signals which are marked with
+ *                         the 'set' access can be used to change the state of
+ *                         the signal.
+ *                 mask  : Bit field with the same structure as state. Each bit
+ *                         in state corresponds to a bit in mask. Settabled
+ *                         bits marked by a 1 are manipulated by the driver.
+ *            Out: none
+ *
+ * Returns  : FD_OK           : Successful operation.
+ *            FD_INTERNAL_ERR : Internal problem with the hardware.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_SetLineState (T_fd_UartId uartNo,
+                  SYS_UWORD32 state,
+                  SYS_UWORD32 mask)
+{
+    t_uart  *uart;
+    UNSIGNED break_length;
+
+    uart = &(uart_parameters[uartNo]);
+
+    /*
+     * There is no case where FD_INTERNAL_ERR may be returned.
+     * DTR is not supported. The SA field is ignored.
+     */
+
+    if ((mask & (1 << SA)) || (mask & (1 << DCD)))
+        return (FD_NOT_SUPPORTED); /* Return used to simplify the code */
+ 
+    /*
+     * Check if a break has to be sent.
+     */
+
+    uart->break_length = (UNSIGNED) ((state >> BRKLEN) & 0xFF);
+
+    if (state & (1 << BRK) && (mask & (1 << BRK))) {
+
+        if (uart->break_length > FIFO_SIZE)
+            return (FD_NOT_SUPPORTED); /* Return used to simplify the code */
+
+        else {
+
+            uart->time_without_character =
+                compute_break_time (uart->baudrate, uart->bits_per_char, 3);
+
+            uart->break_to_send = 1;
+
+            /*
+             * If the TX FIFO is empty the break is send from this function
+             * else the interrupt handler will send the break.
+             */
+
+            if (READ_UART_REGISTER (uart, LSR) & TEMT)
+                send_break(uart);
+        }
+    }
+
+    /*
+     * Disable sleep mode.
+     */
+
+    WRITE_UART_REGISTER (
+        uart, IER, READ_UART_REGISTER (uart, IER) & ~IER_SLEEP);
+
+    /*
+     * The CTS field is ignored if the RTS/CTS flow control is selected.
+     */
+
+    if (mask & (1 << CTS)) {
+    
+        if (uart->flow_control_mode != fc_rts) {
+        
+            /*
+             * As the RTS/CTS flow control is not selected, the X bit does not
+             * control CTS. CTS needs only to be activated or deactivated
+             * according to the value of the CTS field.
+             */
+
+        if (state & (1 << CTS))
+            WRITE_UART_REGISTER (
+                uart, MCR, READ_UART_REGISTER (uart, MCR) | MRTS);
+
+        else
+            WRITE_UART_REGISTER (
+                uart, MCR, READ_UART_REGISTER (uart, MCR) & ~MRTS);
+
+        } else if (!(mask & (1 << X))) {
+
+            /*
+             * The RTS/CTS flow control is selected but the X bit in the mask
+             * is null. Then the CTS bit controls CTS and the receiver must be
+             * stopped or started according to the state of the CTS bit.
+             * The receiver is started only if it was not stopped by the driver
+             * and if it was stopped by the application.
+             */
+             
+            if (state & (1 << CTS)) {
+
+                if (!uart->rx_stopped_by_application) {
+                
+                    if (!uart->rx_stopped_by_driver)
+                        stop_receiver (uart);
+
+                    uart->rx_stopped_by_application = 1;
+                }
+                
+            } else {
+                
+                if ((!uart->rx_stopped_by_driver) &&
+                    uart->rx_stopped_by_application)
+                    start_receiver (uart);
+
+                uart->rx_stopped_by_application = 0;
+            }
+        }
+    }
+
+    /*
+     * The DCD field is ignored if the SB bit of the mask is set.
+     */
+
+    if (!(mask & (1 << SB)) && (mask & (1 << DCD))) {
+
+        if (state & (1 << DCD))
+            WRITE_UART_REGISTER (
+                uart, MCR, READ_UART_REGISTER (uart, MCR) | MDTR);
+
+        else
+            WRITE_UART_REGISTER (
+                uart, MCR, READ_UART_REGISTER (uart, MCR) & ~MDTR);
+    }
+
+    /*
+     * Signals are set according to fields SA, SB and X states and flow
+     * control:
+     *
+     *       None    RTS/CTS    XON/XOFF
+     * SA    0 (ns)  0 (ns)     0 (ns)
+     * SB    DCD     DCD        DCD
+     * X     ignore  CTS        XON:0 XOFF:1 (receiver)
+     *
+     * ns: signal not supported.
+     * DTR/DSR flow control is not supported.
+     */
+
+    if (mask & (1 << SB)) {
+
+        if (state & (1 << SB))
+            WRITE_UART_REGISTER (
+                uart, MCR, READ_UART_REGISTER (uart, MCR) | MDTR);
+
+        else
+            WRITE_UART_REGISTER (
+                uart, MCR, READ_UART_REGISTER (uart, MCR) & ~MDTR);
+    }
+
+        
+    if ((mask & (1 << X)) &&
+        (uart->flow_control_mode != fc_none)) {
+
+            if (state & (1 << X)) {
+                
+            if (!uart->rx_stopped_by_application) {
+                
+                if (!uart->rx_stopped_by_driver)
+                stop_receiver (uart);
+
+                uart->rx_stopped_by_application = 1;
+            }
+                
+            } else {
+                
+            /*
+             * The receiver is started only if it is not stopped by the driver
+             * and if it is stopped by the application.
+             */
+
+            if ((!uart->rx_stopped_by_driver) &&
+                uart->rx_stopped_by_application)
+                start_receiver (uart);
+
+                uart->rx_stopped_by_application = 0;
+            }
+        }
+
+    /*
+     * Re-enable sleep mode.
+     */
+
+    WRITE_UART_REGISTER (
+        uart, IER, READ_UART_REGISTER (uart, IER) | IER_SLEEP);
+
+    return (FD_OK);
+}
+
+/*******************************************************************************
+ *
+ *                           UAF_InterruptHandler
+ * 
+ * Purpose  : Interrupt handler.
+ *
+ * Arguments: In : uart_id         : origin of interrupt
+ *                 interrupt_status: source of interrupt
+ *            Out: none
+ *
+ * Returns  : none
+ *
+ ******************************************************************************/
+
+void
+UAF_InterruptHandler (T_fd_UartId uart_id,
+                      SYS_UWORD8 interrupt_status)
+{
+
+    t_uart *uart;
+
+    /*
+     * uart_id is not used.
+     */
+     
+    uart = &(uart_parameters[uart_id]);
+
+    uart->current_time = NU_Retrieve_Clock ();
+
+    /*
+     * Causes of interrupt:
+     *      - trigger level reached,
+     *      - character time-out indication,
+     *      - transmitter holding register empty,
+     *      - modem status.
+     */
+
+    switch (interrupt_status) {
+
+    case RX_DATA:
+
+        read_rx_fifo (uart);
+        break;
+
+    case TX_EMPTY:
+
+        fill_tx_fifo (uart);
+        break;
+
+    case MODEM_STATUS:
+
+        check_v24_input_lines (uart);
+        break;
+    }
+}
+
+/*******************************************************************************
+ *
+ *                              UAF_CheckXEmpty
+ * 
+ * Purpose  : Checks the empty condition of the Transmitter.
+ *
+ * Arguments: In : none
+ *            Out: none
+ *
+ * Returns  : FD_OK           : Empty condition OK.
+ *            FD_NOT_READY    : Empty condition not OK.
+ *            FD_INTERNAL_ERR : Internal problem with the hardware.
+ *
+ ******************************************************************************/
+
+T_FDRET
+UAF_CheckXEmpty (T_fd_UartId uartNo)
+{
+    T_FDRET result;
+    t_uart *uart;
+    SYS_UWORD8 status;
+
+    /*
+     * There is no case where FD_INTERNAL_ERR may be returned.
+	 */
+
+    result = FD_OK;
+    
+    uart = &(uart_parameters[uartNo]);
+    status = READ_UART_REGISTER (uart, LSR);
+
+    /*
+     * Checks if:
+     *     - the TX SW Buffer is empty,
+     *     - the TX HW FIFO is empty (THRE),
+     *     - the Transmitter Shift Register is empty (TEMT).
+     */
+
+    if (!(TX_BUFFER_EMPTY (uart)) ||
+        !(status & THRE) ||
+        !(status & TEMT))
+
+        result = FD_NOT_READY;
+
+    return (result);
+}
+