--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/g23m-aci/uart/uart_dtxs.c	Tue Oct 11 02:02:43 2016 +0000
@@ -0,0 +1,1305 @@
+/*
++-----------------------------------------------------------------------------
+|  Project :
+|  Modul   :
++-----------------------------------------------------------------------------
+|  Copyright 2002 Texas Instruments Berlin, AG
+|                 All rights reserved.
+|
+|                 This file is confidential and a trade secret of Texas
+|                 Instruments Berlin, AG
+|                 The receipt of or possession of this file does not convey
+|                 any rights to reproduce or disclose its contents or to
+|                 manufacture, use, or sell anything it may describe, in
+|                 whole, or in part, without the specific written consent of
+|                 Texas Instruments Berlin, AG.
++-----------------------------------------------------------------------------
+|  Purpose :  This modul is part of the entity UART and implements all
+|             functions to handles the incoming process internal signals as
+|             described in the SDL-documentation (DTX-statemachine)
++-----------------------------------------------------------------------------
+*/
+
+#ifndef UART_DTXS_C
+#define UART_DTXS_C
+#endif /* !UART_DTXS_C */
+
+#define ENTITY_UART
+
+/*==== INCLUDES =============================================================*/
+
+#ifdef _SIMULATION_
+#include <stdio.h>
+#endif
+#ifdef WIN32
+#include "nucleus.h"
+#endif /* WIN32 */
+#include "typedefs.h"   /* to get Condat data types */
+#include "vsi.h"        /* to get a lot of macros */
+#include "macdef.h"     /* to get a lot of macros */
+#include "custom.h"
+#include "gsm.h"        /* to get a lot of macros */
+#include "cnf_uart.h"   /* to get cnf-definitions */
+#include "mon_uart.h"   /* to get mon-definitions */
+#include "prim.h"       /* to get the definitions of used SAP and directions */
+#include "dti.h"        /* to get dti lib */
+#include "pei.h"        /* to get PEI interface */
+#ifdef FF_MULTI_PORT
+#include "gsi.h"        /* to get definitions of serial driver */
+#else /* FF_MULTI_PORT */
+#ifdef _TARGET_
+#include "uart/serialswitch.h"
+#include "uart/traceswitch.h"
+#else /* _TARGET_ */
+#include "serial_dat.h" /* to get definitions of serial driver */
+#endif /* _TARGET_ */
+#endif /* FF_MULTI_PORT */
+#include "uart.h"       /* to get the global entity definitions */
+
+#include "uart_dtxf.h"  /* to get DTX function definitions */
+#include "uart_dtxp.h"  /* to get DTX primitive definitions */
+#include "uart_kers.h"  /* to get KER signal definitions */
+#include "uart_rts.h"   /* to get RT  signal definitions */
+#ifdef FF_MULTI_PORT
+#include "uart_prxs.h"  /* to get signal definitions for service TX */
+#else /* FF_MULTI_PORT */
+#include "uart_rxs.h"   /* to get TX signal definitions */
+#endif /* FF_MULTI_PORT */
+#include <string.h>    /* JK, delete warnings: to get memmove, memcpy */
+
+/*==== CONST ================================================================*/
+
+/*==== LOCAL VARS ===========================================================*/
+
+/*==== PRIVATE FUNCTIONS ====================================================*/
+
+/*==== PUBLIC FUNCTIONS =====================================================*/
+
+
+
+/*
++------------------------------------------------------------------------------
+| Function    : sig_ker_dtx_ready_mode_req
++------------------------------------------------------------------------------
+| Description : Handles the internal signal SIG_KER_DTX_READY_MODE_REQ
+|
+| Parameters  : dlc_instance - dlc instance wich belongs to this DTX instance
+|
++------------------------------------------------------------------------------
+*/
+GLOBAL void sig_ker_dtx_ready_mode_req (UBYTE dlc_instance)
+{
+  TRACE_ISIG( "sig_ker_dtx_ready_mode_req" );
+
+  uart_data->dtx->dlc_instance = dlc_instance;
+
+  switch( GET_STATE( UART_SERVICE_DTX ) )
+  {
+    case DTX_DEAD:
+      SET_STATE( UART_SERVICE_DTX, DTX_NOT_READY );
+
+      /*
+     * reset line states
+     */
+    uart_data->dtx->st_flow       = DTI_FLOW_ON;
+    uart_data->dtx->st_line_sa    = DTI_SA_ON;
+    uart_data->dtx->st_line_sb    = DTI_SB_ON;
+    uart_data->dtx->st_break_len  = DTI_BREAK_OFF;
+    uart_data->dtx->detect_escape = TRUE;
+
+      uart_data->dtx->data_flow = UART_FLOW_ENABLED;
+      if(uart_data->dtx->receiving_state EQ UART_DTX_NOT_RECEIVING)
+      {
+        /*
+         * reset escape sequence detection
+         */
+        dtx_set_esd_state( UART_ESD_NULL );
+        uart_data->dtx->detect_escape = TRUE;
+        if(vsi_t_time (VSI_CALLER &(uart_data->dtx->esd_guard_time))
+                                                         NEQ VSI_OK)
+        {
+          TRACE_ERROR_P1("VSI entity: Can't restart timer, uart_dtxs.c(%d)",
+                                                                  __LINE__);
+        }
+        uart_data->dtx->esd_pos = 0;
+        /*
+         * start reception
+         */
+        dtx_allocate_resources();
+        sig_dtx_rx_ready_to_receive_req( uart_data->dtx->dlc_instance,
+                                         uart_data->dtx->to_send_data,
+                                         uart_data->dtx->write_pos,
+                                         uart_data->dtx->cur_desc_size );
+      }
+      break;
+
+    case DTX_READY:
+    case DTX_NOT_READY:
+      break;
+
+    default:
+      TRACE_ERROR( "SIG_KER_DTX_READY_MODE_REQ unexpected" );
+      break;
+  }
+} /* sig_ker_dtx_ready_mode_req() */
+
+
+
+/*
++------------------------------------------------------------------------------
+| Function    : sig_ker_dtx_dead_mode_req
++------------------------------------------------------------------------------
+| Description : Handles the internal signal SIG_KER_DTX_DEAD_MODE_REQ
+|
+| Parameters  : none
+|
++------------------------------------------------------------------------------
+*/
+GLOBAL void sig_ker_dtx_dead_mode_req ()
+{
+  TRACE_ISIG( "sig_ker_dtx_dead_mode_req" );
+
+  switch( GET_STATE( UART_SERVICE_DTX ) )
+  {
+    case DTX_READY:
+    case DTX_NOT_READY:
+      SET_STATE( UART_SERVICE_DTX, DTX_DEAD );
+      /*
+       * reset hComm_DTX_UPLINK and size_multiplier
+       */
+      uart_data->dtx->dti_dtx_state   = DTI_CLOSED;
+      uart_data->dtx->size_multiplier = 3;
+
+      if(uart_data->dtx->receiving_state EQ UART_DTX_NOT_RECEIVING)
+      {
+        /*
+         * free recources and stop receiving
+         */
+        sig_dtx_rx_not_ready_to_receive_req(uart_data->dtx->dlc_instance);
+        dtx_free_resources();
+      }
+      else
+        uart_data->dtx->receiving_state = UART_DTX_INVALID;
+      break;
+
+    case DTX_DEAD:
+      break;
+
+    default:
+      TRACE_ERROR( "SIG_KER_DTX_DEAD_MODE_REQ unexpected" );
+      break;
+  }
+} /* sig_ker_dtx_dead_mode_req() */
+
+
+
+/*
++------------------------------------------------------------------------------
+| Function    : sig_rx_dtx_receiving_ind
++------------------------------------------------------------------------------
+| Description : Handles the internal signal SIG_RX_DTX_RECEIVING_IND
+|
+| Parameters  : none
+|
++------------------------------------------------------------------------------
+*/
+GLOBAL void sig_rx_dtx_receiving_ind ()
+{
+  TRACE_ISIG( "sig_rx_dtx_receiving_ind" );
+
+  uart_data->dtx->receiving_state = UART_DTX_RECEIVING;
+
+  switch( GET_STATE( UART_SERVICE_DTX ) )
+  {
+    case DTX_READY:
+    case DTX_NOT_READY:
+      break;
+
+    default:
+      TRACE_ERROR( "SIG_RX_DTX_RECEIVING_IND unexpected" );
+      break;
+  }
+} /* sig_ker_dtx_receiving_ind() */
+
+
+
+/*
++------------------------------------------------------------------------------
+| Function    : sig_rx_dtx_data_received_ind
++------------------------------------------------------------------------------
+| Description : Handles the internal signal SIG_RX_DTX_DATA_RECEIVED_IND
+|
+| Parameters  : none
+|
++------------------------------------------------------------------------------
+*/
+GLOBAL void sig_rx_dtx_data_received_ind (T_desc2* received_data,
+                                          USHORT  write_pos)
+{
+  T_DATA_FLOW_STATE old_data_flow;
+  T_desc2*          temp_desc;
+  USHORT            esd_pos;
+  T_TIME            cur_time;
+
+  TRACE_ISIG( "sig_rx_dtx_data_received_ind" );
+
+#ifdef UART_RANGE_CHECK
+  if(received_data EQ NULL)
+  {
+    TRACE_EVENT("ERROR: received_data is NULL");
+  }
+  else if((*((ULONG*)((UBYTE*)received_data - 8))) NEQ 0)
+  {
+    TRACE_EVENT_P1("ERROR: received_data=%08x is not allocated",
+                    received_data);
+  }
+  if(uart_data->dtx->to_send_data NEQ received_data)
+  {
+    TRACE_EVENT_P2("ERROR: to_send_data=%08x NEQ received_data=%08x",
+                    uart_data->dtx->to_send_data,
+                    received_data);
+  }
+  if(uart_data->dtx->to_send_data->len > uart_data->dtx->cur_desc_size)
+  {
+    TRACE_EVENT_P2("ERROR: to_send_data->len=%d > cur_desc_size=%d",
+                    uart_data->dtx->to_send_data->len,
+                    uart_data->dtx->cur_desc_size);
+  }
+  if(write_pos > uart_data->dtx->cur_desc_size)
+  {
+    TRACE_EVENT_P2("ERROR: write_pos=%d > cur_desc_size=%d",
+                    write_pos,
+                    uart_data->dtx->cur_desc_size);
+  }
+  if(uart_data->dtx->to_send_data->len > write_pos)
+  {
+    TRACE_EVENT_P2("ERROR: to_send_data->len=%d > write_pos=%d",
+                    uart_data->dtx->to_send_data->len,
+                    write_pos);
+  }
+  if(uart_data->dtx->esd_pos > write_pos)
+  {
+    TRACE_EVENT_P2("ERROR: esd_pos=%d > write_pos=%d",
+                    uart_data->dtx->esd_pos,
+                    write_pos);
+  }
+  switch(dtx_get_esd_state())
+  {
+    case UART_ESD_DETECTED:
+      if(uart_data->dtx->esd_pos < 3)
+      {
+        TRACE_EVENT_P1("ERROR: esd_pos=%d < 3 in UART_ESD_DETECTED state",
+                        uart_data->dtx->esd_pos);
+      }
+      break;
+    case UART_ESD_CHAR_1:
+      if(uart_data->dtx->esd_pos < 1)
+      {
+        TRACE_EVENT_P1("ERROR: esd_pos=%d < 1 in UART_ESD_CHAR_1 state",
+                        uart_data->dtx->esd_pos);
+      }
+      break;
+    case UART_ESD_CHAR_2:
+      if(uart_data->dtx->esd_pos < 2)
+      {
+        TRACE_EVENT_P1("ERROR: esd_pos=%d < 2 in UART_ESD_CHAR_2 state",
+                        uart_data->dtx->esd_pos);
+      }
+      break;
+    case UART_ESD_CHAR_3:
+      if(uart_data->dtx->esd_pos < 3)
+      {
+        TRACE_EVENT_P1("ERROR: esd_pos=%d < 3 in UART_ESD_CHAR_3 state",
+                        uart_data->dtx->esd_pos);
+      }
+      break;
+  }
+#endif /* UART_RANGE_CHECK */
+
+  /*
+   * store new write position,
+   * current data_flow state and
+   * current data descriptor
+   */
+  uart_data->dtx->write_pos = write_pos;
+  old_data_flow             = uart_data->dtx->data_flow;
+  temp_desc                 = received_data;
+
+  /*
+   * Introduce local variable here in order to prevent
+   * the target compiler from doing wrong calculations ...
+   */
+  esd_pos = uart_data->dtx->esd_pos;
+
+  /*
+   * escape sequence detection
+   */
+  if(uart_data->dtx->receiving_state EQ UART_DTX_RECEIVING &&
+     uart_data->dtx->detect_escape EQ TRUE)
+  {
+    if (vsi_t_time (VSI_CALLER &cur_time) EQ VSI_OK)
+    {
+      switch(dtx_get_esd_state())
+      {
+        case UART_ESD_DETECTED:
+          /*
+           * remove escape characters because escape sequence was detected
+           */
+          if(uart_data->dtx->write_pos > esd_pos)
+          {
+            memmove(&temp_desc->buffer[esd_pos - 3],
+                    &temp_desc->buffer[esd_pos],
+                    uart_data->dtx->write_pos - esd_pos);
+          }
+          uart_data->dtx->write_pos-= 3;
+          esd_pos -= 3;
+          uart_data->dtx->esd_pos = esd_pos;
+          dtx_set_esd_state( UART_ESD_NULL );
+          /* fall through */
+        case UART_ESD_NULL:
+#ifdef _SIMULATION_
+          TRACE_EVENT_P2("uart_data->act_gp: %d, silence: %d",
+                          uart_data->act_gp,
+                          (cur_time - uart_data->dtx->esd_guard_time));
+#endif /* _SIMULATION_ */
+          if(esd_pos >= temp_desc->len)
+            break;
+
+          if(((cur_time -
+               uart_data->dtx->esd_guard_time) < uart_data->act_gp) ||
+             (temp_desc->
+              buffer[esd_pos] NEQ uart_data->act_ec))
+          {
+            /*
+             * set new reference time and
+             * update esd_pos
+             */
+            esd_pos                        = temp_desc->len;
+            uart_data->dtx->esd_pos        = esd_pos;
+            uart_data->dtx->esd_guard_time = cur_time;
+            break;
+          }
+          /*
+           * first guard period complete and
+           * first escape character detected
+           */
+#ifdef _SIMULATION_
+          TRACE_EVENT("+ + + first guard period complete + + +");
+#endif /* _SIMULATION_ */
+          dtx_set_esd_state( UART_ESD_CHAR_1 );
+          esd_pos++;
+          uart_data->dtx->esd_pos        = esd_pos;
+          uart_data->dtx->esd_guard_time = cur_time;
+          sig_dtx_rt_start_tesd_req (uart_data->act_gp);
+          /* fall trough */
+        case UART_ESD_CHAR_1:
+          if(esd_pos >= temp_desc->len)
+          {
+            /*
+             * hide 1 character
+             */
+            temp_desc->len  = esd_pos - 1;
+            temp_desc->size = temp_desc->len;
+            break;
+          }
+
+          if(temp_desc->
+             buffer[esd_pos] NEQ uart_data->act_ec)
+          {
+            /*
+             * second character is not an escape character
+             */
+            dtx_set_esd_state( UART_ESD_NULL );
+            esd_pos                        = temp_desc->len;
+            uart_data->dtx->esd_pos        = esd_pos;
+            uart_data->dtx->esd_guard_time = cur_time;
+            break;
+          }
+          /*
+           * second escape character received
+           */
+          dtx_set_esd_state( UART_ESD_CHAR_2 );
+          esd_pos++;
+          uart_data->dtx->esd_pos = esd_pos;
+          /* fall trough */
+        case UART_ESD_CHAR_2:
+          if(esd_pos >= temp_desc->len)
+          {
+            /*
+             * hide 2 characters
+             */
+            temp_desc->len  = esd_pos - 2;
+            temp_desc->size = temp_desc->len;
+            break;
+          }
+          /*
+           * set new reference time
+           */
+          uart_data->dtx->esd_guard_time = cur_time;
+
+          if(temp_desc->
+             buffer[esd_pos] NEQ uart_data->act_ec)
+          {
+            /*
+             * third character is not an escape character
+             */
+            dtx_set_esd_state( UART_ESD_NULL );
+            esd_pos                 = temp_desc->len;
+            uart_data->dtx->esd_pos = esd_pos;
+            break;
+          }
+          /*
+           * third escape character received
+           */
+          dtx_set_esd_state( UART_ESD_CHAR_3 );
+          esd_pos++;
+          uart_data->dtx->esd_pos = esd_pos;
+          sig_dtx_rt_start_tesd_req (uart_data->act_gp);
+          /* fall trough */
+        case UART_ESD_CHAR_3:
+          if(esd_pos >= temp_desc->len)
+          {
+            /*
+             * hide 3 characters
+             */
+            temp_desc->len  = esd_pos - 3;
+            temp_desc->size = temp_desc->len;
+            break;
+          }
+          /*
+           * fourth character received
+           */
+          dtx_set_esd_state( UART_ESD_NULL );
+          esd_pos                        = temp_desc->len;
+          uart_data->dtx->esd_pos        = esd_pos;
+          uart_data->dtx->esd_guard_time = cur_time;
+          break;
+
+        default:
+          TRACE_ERROR("wrong esd state");
+          break;
+      }
+    }
+    else
+    {
+      TRACE_ERROR_P1("VSI entity: Can't restart timer, uart_dtxs.c(%d)",
+                                                              __LINE__);
+    }
+  }
+
+  switch( GET_STATE( UART_SERVICE_DTX ) )
+  {
+    case DTX_DEAD:
+      dtx_free_resources();
+      uart_data->dtx->receiving_state = UART_DTX_NOT_RECEIVING;
+      break;
+
+    case DTX_READY:
+      /*
+       * enable data flow if necessary
+       */
+      if(old_data_flow NEQ UART_FLOW_ENABLED)
+      {
+        uart_data->dtx->data_flow = UART_FLOW_ENABLED;
+        sig_dtx_ker_enable_ind(uart_data->dtx->dlc_instance);
+      }
+
+      if(uart_data->dtx->receiving_state EQ UART_DTX_RECEIVING)
+      {
+        /*
+         * if data to send available or
+         * line states changed
+         */
+        if((temp_desc->len) ||
+           (uart_data->dtx->lines_changed))
+        {
+          PALLOC_DESC2 (dti_data_ind, DTI2_DATA_IND);
+          SET_STATE( UART_SERVICE_DTX, DTX_NOT_READY );
+
+          if(temp_desc->len)
+          {
+            /*
+             * mark entity descriptor as invalid, since data will be forwarded
+             */
+            uart_data->dtx->to_send_data = NULL;
+
+            dti_data_ind->desc_list2.first    = (ULONG)temp_desc;
+            dti_data_ind->desc_list2.list_len = temp_desc->len;
+
+            /*
+             * calculate new size multiplier according to fillrate of buffer
+             */
+            dtx_calculate_size_multiplier (temp_desc, old_data_flow);
+            /*
+             * allocate a new descriptor with size according to new size_multiplier
+             */
+            dtx_allocate_resources();
+            /*
+             * Check for data which has not yet been validated, i.e. because
+             * the frame containing the data has not yet been received completely.
+             * In this case, the not yet validated data is copied to the newly
+             * allocated descriptor.
+             */
+            if(uart_data->dtx->write_pos > temp_desc->len)
+            {
+              memcpy(uart_data->dtx->to_send_data->buffer,
+                     &temp_desc->buffer[temp_desc->len],
+                     uart_data->dtx->write_pos - temp_desc->len);
+              uart_data->dtx->write_pos-= temp_desc->len;
+            }
+            esd_pos-= temp_desc->len;
+            uart_data->dtx->esd_pos = esd_pos;
+          }
+          else
+          {
+            /*
+             * just line states has been changed
+             */
+            dti_data_ind->desc_list2.first    = (ULONG)NULL;
+            dti_data_ind->desc_list2.list_len = 0;
+          }
+
+          /*
+           * set line states and
+           * mark line states as unchanged;
+           */
+          dti_data_ind->parameters.st_lines.st_flow      = uart_data->dtx->st_flow;
+          dti_data_ind->parameters.st_lines.st_line_sa   = uart_data->dtx->st_line_sa;
+          dti_data_ind->parameters.st_lines.st_line_sb   = uart_data->dtx->st_line_sb;
+          dti_data_ind->parameters.st_lines.st_break_len = uart_data->dtx->st_break_len;
+
+          uart_data->dtx->lines_changed = FALSE;
+          uart_data->dtx->st_break_len  = DTI_BREAK_OFF;
+
+          dti_send_data(
+            uart_hDTI,
+            uart_data->device,
+            UART_DTI_UP_INTERFACE,
+            uart_data->dtx->dlc_instance,
+            dti_data_ind
+            );
+        }
+      }
+      else
+      {
+        /*
+         * invalid data
+         * free recources and allocate a new descriptor because
+         * size_multiplier may have changed
+         */
+        dtx_free_resources();
+        dtx_allocate_resources();
+        /*
+         * reset escape sequence detection
+         */
+        dtx_set_esd_state( UART_ESD_NULL );
+        if(vsi_t_time (VSI_CALLER &(uart_data->dtx->esd_guard_time)) NEQ VSI_OK)
+        {
+          TRACE_ERROR_P1("VSI entity: Can't restart timer, uart_dtxs.c(%d)",
+                                                                  __LINE__);
+        }
+
+        esd_pos = 0;
+        uart_data->dtx->esd_pos = esd_pos;
+      }
+
+      /*
+       * signal availability to receive to RX service
+       */
+      uart_data->dtx->receiving_state = UART_DTX_NOT_RECEIVING;
+      sig_dtx_rx_ready_to_receive_req( uart_data->dtx->dlc_instance,
+                                       uart_data->dtx->to_send_data,
+                                       uart_data->dtx->write_pos,
+                                       uart_data->dtx->cur_desc_size );
+      break;
+
+    case DTX_NOT_READY:
+      if(uart_data->dtx->receiving_state EQ UART_DTX_RECEIVING)
+      {
+        uart_data->dtx->receiving_state = UART_DTX_NOT_RECEIVING;
+        if((old_data_flow NEQ UART_FLOW_DISABLED) &&
+           ((uart_data->dtx->cur_desc_size - temp_desc->len) <
+            ((USHORT)uart_data->n1 << 1)))
+        {
+          /*
+           * the service DTX is receiving but there is not enough space left
+           * therefore it is necessary to disable the data flow
+           */
+          uart_data->dtx->data_flow = UART_FLOW_DISABLED;
+          sig_dtx_ker_disable_ind(uart_data->dtx->dlc_instance);
+        }
+        if((uart_data->dtx->cur_desc_size -
+            esd_pos) >= uart_data->n1)
+        {
+          /*
+           * there is still enough space left to continue reception
+           */
+          sig_dtx_rx_ready_to_receive_req(uart_data->dtx->dlc_instance,
+                                          uart_data->dtx->to_send_data,
+                                          uart_data->dtx->write_pos,
+                                          uart_data->dtx->cur_desc_size);
+        }
+      }
+      else
+      {
+        /*
+         * invalid data
+         * free recources and allocate a new descriptor
+         * because size_multiplier may have changed
+         */
+        dtx_free_resources();
+        dtx_allocate_resources();
+        /*
+         * reset escape sequence detection
+         */
+        dtx_set_esd_state( UART_ESD_NULL );
+        if(vsi_t_time (VSI_CALLER &(uart_data->dtx->esd_guard_time)) NEQ VSI_OK)
+        {
+          TRACE_ERROR_P1("VSI entity: Can't restart timer, uart_dtxs.c(%d)",
+                                                                  __LINE__);
+        }
+
+        esd_pos = 0;
+        uart_data->dtx->esd_pos = esd_pos;
+        /*
+         * enable flow control if necessary
+         */
+        if(old_data_flow NEQ UART_FLOW_ENABLED)
+        {
+          uart_data->dtx->data_flow = UART_FLOW_ENABLED;
+          sig_dtx_ker_enable_ind(uart_data->dtx->dlc_instance);
+        }
+        /*
+         * signal availability to receive to RX service
+         */
+        uart_data->dtx->receiving_state = UART_DTX_NOT_RECEIVING;
+        sig_dtx_rx_ready_to_receive_req( uart_data->dtx->dlc_instance,
+                                         uart_data->dtx->to_send_data,
+                                         uart_data->dtx->write_pos,
+                                         uart_data->dtx->cur_desc_size );
+      }
+      break;
+
+    default:
+      TRACE_ERROR( "SIG_RX_DTX_DATA_RECEIVED_IND unexpected" );
+      break;
+
+  }
+} /* sig_rx_dtx_data_received_ind() */
+
+
+/*
++------------------------------------------------------------------------------
+| Function    : sig_ker_dtx_line_states_req
++------------------------------------------------------------------------------
+| Description : Handles the internal signal SIG_KER_DTX_LINE_STATES_REQ
+|               which indicates that one or more line status signals have
+|               changed
+|
+| Parameters  : st_flow      - flow control state (X bit)
+|               st_line_sa   - line state SA
+|               st_line_sa   - line state SB
+|               st_break_len - break length
+|
++------------------------------------------------------------------------------
+*/
+GLOBAL void sig_ker_dtx_line_states_req(UBYTE st_flow,
+                                        UBYTE st_line_sa,
+                                        UBYTE st_line_sb,
+                                        UBYTE st_break_len)
+{
+  TRACE_ISIG( "sig_ker_dtx_line_states_req" );
+
+  switch( GET_STATE( UART_SERVICE_DTX ) )
+  {
+    case DTX_READY:
+      if((st_flow      NEQ uart_data->dtx->st_flow)    ||
+         (st_line_sa   NEQ uart_data->dtx->st_line_sa) ||
+         (st_line_sb   NEQ uart_data->dtx->st_line_sb) ||
+         (st_break_len NEQ uart_data->dtx->st_break_len))
+      {
+        /*
+         * send line states to DTI peer
+         */
+        PALLOC_DESC2 (dti_data_ind, DTI2_DATA_IND);
+        SET_STATE( UART_SERVICE_DTX, DTX_NOT_READY );
+
+        /*
+         * store new line states
+         */
+        uart_data->dtx->st_flow       = st_flow;
+        uart_data->dtx->st_line_sa    = st_line_sa;
+        uart_data->dtx->st_line_sb    = st_line_sb;
+        uart_data->dtx->st_break_len  = st_break_len;
+
+        /*
+         * just line states has been changed
+         */
+        dti_data_ind->desc_list2.first    = (ULONG)NULL;
+        dti_data_ind->desc_list2.list_len = 0;
+        /*
+         * set line states and
+         * mark line states as unchanged;
+         */
+        dti_data_ind->parameters.st_lines.st_flow      = uart_data->dtx->st_flow;
+        dti_data_ind->parameters.st_lines.st_line_sa   = uart_data->dtx->st_line_sa;
+        dti_data_ind->parameters.st_lines.st_line_sb   = uart_data->dtx->st_line_sb;
+        dti_data_ind->parameters.st_lines.st_line_sb   = uart_data->dtx->st_line_sb;
+        dti_data_ind->parameters.st_lines.st_break_len = uart_data->dtx->st_break_len;
+
+        uart_data->dtx->lines_changed = FALSE;
+        uart_data->dtx->st_break_len  = DTI_BREAK_OFF;
+
+        dti_send_data(
+          uart_hDTI,
+          uart_data->device,
+          UART_DTI_UP_INTERFACE,
+          uart_data->dtx->dlc_instance,
+          dti_data_ind
+          );
+      }
+      break;
+
+    case DTX_NOT_READY:
+      if((st_flow      NEQ uart_data->dtx->st_flow)    ||
+         (st_line_sa   NEQ uart_data->dtx->st_line_sa) ||
+         (st_line_sb   NEQ uart_data->dtx->st_line_sb) ||
+         (st_break_len NEQ uart_data->dtx->st_break_len))
+      {
+        /*
+         * If previously break detected keep information in
+         * uart_data->dtx->st_break_len
+         */
+        if(uart_data->dtx->st_break_len EQ DTI_BREAK_OFF)
+          uart_data->dtx->st_break_len = st_break_len;
+        /*
+         * store new line states
+         */
+        uart_data->dtx->st_flow    = st_flow;
+        uart_data->dtx->st_line_sa = st_line_sa;
+        uart_data->dtx->st_line_sb = st_line_sb;
+        /*
+         * mark line states as changed
+         */
+        uart_data->dtx->lines_changed = TRUE;
+      }
+      break;
+
+    default:
+      TRACE_ERROR( "SIG_KER_DTX_LINE_STATES_REQ unexpected" );
+      break;
+  }
+} /* sig_ker_dtx_line_states_req */
+
+
+
+/*
++------------------------------------------------------------------------------
+| Function    : sig_ker_dtx_detect_escape_req
++------------------------------------------------------------------------------
+| Description : Handles the internal signal SIG_KER_DTX_DETECT_ESCAPE_REQ
+|               which enables escape sequence detection
+|
+| Parameters  : detect_escape - TRUE/FALSE
+|
++------------------------------------------------------------------------------
+*/
+GLOBAL void sig_ker_dtx_detect_escape_req (UBYTE detect_escape)
+{
+  TRACE_ISIG( "sig_ker_dtx_detect_req" );
+
+  uart_data->dtx->detect_escape = detect_escape;
+} /* sig_ker_dtx_detect_req() */
+
+
+/*
++------------------------------------------------------------------------------
+| Function    : sig_ker_dtx_disconnected_mode_req
++------------------------------------------------------------------------------
+| Description : Handles the internal signal SIG_KER_DTX_DISCONNECTED_MODE_REQ
+|
+| Parameters  : none
+|
++------------------------------------------------------------------------------
+*/
+GLOBAL void sig_ker_dtx_disconnected_mode_req ()
+{
+  TRACE_ISIG( "sig_ker_dtx_disconnected_mode_req" );
+
+  uart_data->dtx->dti_dtx_state = DTI_CLOSED;
+
+  switch(GET_STATE( UART_SERVICE_DTX) )
+  {
+    case DTX_READY:
+      SET_STATE( UART_SERVICE_DTX, DTX_NOT_READY );
+      break;
+    case DTX_NOT_READY:
+      break;
+    default:
+      TRACE_ERROR( "SIG_KER_DTX_DISCONNECTED_MODE_REQ unexpected" );
+      break;
+  }
+
+} /* sig_ker_dtx_disconnected_mode_req() */
+
+
+
+/*
++------------------------------------------------------------------------------
+| Function    : sig_ker_dtx_set_dtilib_peer_req
++------------------------------------------------------------------------------
+| Description : Handles the internal signal SIG_KER_DTX_SET_DTI_PEER_REQ
+|               which is used to inform the service DTX that from now on it
+|               needs to communicate with a (new) peer
+|
+| Parameters  : -
+|
++------------------------------------------------------------------------------
+*/
+GLOBAL void sig_ker_dtx_set_dtilib_peer_req ()
+
+{
+  TRACE_ISIG( "sig_ker_dtx_set_dtilib_peer_req" );
+
+  /*
+   * set dtilib parameters
+   */
+  uart_data->dtx->dti_dtx_state = DTI_IDLE;
+
+  /*
+   * reset size_multiplier
+   */
+  uart_data->dtx->size_multiplier = 3;
+
+  /*
+   * switch to new DTX state depending on current state
+   */
+  switch( GET_STATE( UART_SERVICE_DTX ) )
+  {
+    case DTX_READY:
+      SET_STATE( UART_SERVICE_DTX, DTX_NOT_READY );
+      /* fall through */
+    case DTX_NOT_READY:
+      {
+        if(uart_data->dtx->receiving_state EQ UART_DTX_NOT_RECEIVING)
+        {
+          /*
+           * reset received data
+           */
+          dtx_free_resources();
+          dtx_allocate_resources();
+          /*
+           * reset escape sequence detection
+           */
+          dtx_set_esd_state( UART_ESD_NULL );
+          if(vsi_t_time (VSI_CALLER &(uart_data->dtx->esd_guard_time)) NEQ VSI_OK)
+          {
+          TRACE_ERROR_P1("VSI entity: Can't restart timer, uart_dtxs.c(%d)",
+                                                                  __LINE__);
+          }
+
+          uart_data->dtx->esd_pos = 0;
+          /*
+           * enable flow control if necessary
+           */
+          if(uart_data->dtx->data_flow NEQ UART_FLOW_ENABLED)
+          {
+            uart_data->dtx->data_flow = UART_FLOW_ENABLED;
+            sig_dtx_ker_enable_ind(uart_data->dtx->dlc_instance);
+          }
+          /*
+           * signal availability to receive to RX service
+           */
+          sig_dtx_rx_ready_to_receive_req( uart_data->dtx->dlc_instance,
+                                           uart_data->dtx->to_send_data,
+                                           uart_data->dtx->write_pos,
+                                           uart_data->dtx->cur_desc_size );
+        }
+        else
+          uart_data->dtx->receiving_state = UART_DTX_INVALID;
+      }
+      break;
+
+    case DTX_DEAD:
+      break;
+
+    default:
+      TRACE_ERROR( "SIG_KER_DTX_SET_DTI_PEER_REQ unexpected" );
+      break;
+  }
+} /* sig_ker_dtx_set_dtilib_peer_req() */
+
+
+
+/*
++------------------------------------------------------------------------------
+| Function    : sig_ker_dtx_timeout_tesd_req
++------------------------------------------------------------------------------
+| Description : Handles the internal signal SIG_KER_DTX_TIMEOUT_TESD_REQ
+|               which is used to inform the service DTX that the Escape
+|               Sequence Guard Period timer has expired.
+|
+| Parameters  : none
+|
++------------------------------------------------------------------------------
+*/
+GLOBAL void sig_ker_dtx_timeout_tesd_req()
+{
+  T_DATA_FLOW_STATE old_data_flow;
+  T_TIME            cur_time;
+  T_TIME            elapsed;
+  T_desc2*          temp_desc;
+
+  TRACE_ISIG( "sig_ker_dtx_timeout_tesd_req" );
+
+  switch( GET_STATE( UART_SERVICE_DTX ) )
+  {
+    case DTX_READY:
+      if (vsi_t_time (VSI_CALLER &cur_time) EQ VSI_OK)
+      {
+        elapsed = cur_time - uart_data->dtx->esd_guard_time;
+        switch (dtx_get_esd_state())
+        {
+          case UART_ESD_DETECTED:
+          case UART_ESD_NULL:
+            break;
+
+          case UART_ESD_CHAR_1:
+          case UART_ESD_CHAR_2:
+            if(elapsed < uart_data->act_gp)
+            {
+              /*
+               * escape sequence guard period not complete: start timer
+               * with remaining time value
+               */
+              sig_dtx_rt_start_tesd_req (uart_data->act_gp - elapsed);
+            }
+            else
+            {
+              /*
+               * Guard Period complete
+               * reset detection because detected characters do not belong to
+               * an escape sequence
+               */
+              dtx_set_esd_state( UART_ESD_NULL );
+
+              /*
+               * if possible send the escape character
+               */
+              if(uart_data->dtx->receiving_state EQ UART_DTX_NOT_RECEIVING)
+              {
+                /*
+                 * Guard Period complete
+                 * send one escape character to DTI peer and reset detection
+                 */
+                PALLOC_DESC2 (dti_data_ind, DTI2_DATA_IND);
+                SET_STATE( UART_SERVICE_DTX, DTX_NOT_READY );
+
+                /*
+                 * enable data flow if necessary
+                 */
+                old_data_flow = uart_data->dtx->data_flow;
+                if(uart_data->dtx->data_flow NEQ UART_FLOW_ENABLED)
+                {
+                  uart_data->dtx->data_flow = UART_FLOW_ENABLED;
+                  sig_dtx_ker_enable_ind(uart_data->dtx->dlc_instance);
+                }
+                /*
+                 * mark entity descriptor as invalid, since data will be
+                 * forwarded
+                 */
+                temp_desc                    = uart_data->dtx->to_send_data;
+                uart_data->dtx->to_send_data = NULL;
+
+                /*
+                 * make escape character valid to send and insert values in
+                 * primitive
+                 */
+                temp_desc->len  = uart_data->dtx->esd_pos;
+                temp_desc->size = temp_desc->len;
+
+                dti_data_ind->desc_list2.first    = (ULONG)temp_desc;
+                dti_data_ind->desc_list2.list_len = temp_desc->len;
+
+                /*
+                 * calculate new size multiplier according to fillrate of buffer
+                 */
+                dtx_calculate_size_multiplier (temp_desc, old_data_flow);
+                /*
+                 * allocate a new descriptor with size according to new size_multiplier
+                 */
+                dtx_allocate_resources();
+                /*
+                 * Check for data which has not yet been validated, i.e. because
+                 * the frame containing the data has not yet been received completely.
+                 * In this case, the not yet validated data is copied to the newly
+                 * allocated descriptor.
+                 */
+                if(uart_data->dtx->write_pos > temp_desc->len)
+                {
+                  memcpy(uart_data->dtx->to_send_data->buffer,
+                         &temp_desc->buffer[temp_desc->len],
+                         uart_data->dtx->write_pos - temp_desc->len);
+                  uart_data->dtx->write_pos-= temp_desc->len;
+                }
+                uart_data->dtx->esd_pos = 0;
+                sig_dtx_rx_ready_to_receive_req(uart_data->dtx->dlc_instance,
+                                                uart_data->dtx->to_send_data,
+                                                uart_data->dtx->write_pos,
+                                                uart_data->dtx->cur_desc_size);
+
+                /*
+                 * set line states
+                 */
+                dti_data_ind->parameters.st_lines.st_flow      = uart_data->dtx->st_flow;
+                dti_data_ind->parameters.st_lines.st_line_sa   = uart_data->dtx->st_line_sa;
+                dti_data_ind->parameters.st_lines.st_line_sb   = uart_data->dtx->st_line_sb;
+                dti_data_ind->parameters.st_lines.st_break_len = uart_data->dtx->st_break_len;
+
+                uart_data->dtx->lines_changed = FALSE;
+                uart_data->dtx->st_break_len  = DTI_BREAK_OFF;
+
+#ifdef _SIMULATION_
+                dti_data_ind->parameters.p_id = DTI_PID_UOS;
+#endif /* _SIMULATION_ */
+                dti_send_data(
+                  uart_hDTI,
+                  uart_data->device,
+                  UART_DTI_UP_INTERFACE,
+                  uart_data->dtx->dlc_instance,
+                  dti_data_ind
+                  );
+              }
+            }
+            break;
+
+          case UART_ESD_CHAR_3:
+            if(elapsed < uart_data->act_gp)
+            {
+              /*
+               * escape sequence guard period not complete: start timer
+               * with remaining time value
+               */
+              sig_dtx_rt_start_tesd_req (uart_data->act_gp - elapsed);
+            }
+            else
+            {
+              /*
+               * Guard Period complete
+               * Escape Sequence detected
+               */
+              /*
+               * remove escape characters from data stream
+               */
+              if(uart_data->dtx->receiving_state EQ UART_DTX_NOT_RECEIVING)
+              {
+                if(uart_data->dtx->write_pos > 3)
+                {
+                  memmove(uart_data->dtx->to_send_data->buffer,
+                          &uart_data->dtx->to_send_data->buffer[3],
+                          uart_data->dtx->write_pos - 3)
+                  ; /*lint !e416 creation of out-of-bounds pointer */
+                  uart_data->dtx->write_pos-= 3;
+                }
+                else
+                  uart_data->dtx->write_pos = 0;
+                uart_data->dtx->esd_pos = 0;
+                sig_dtx_rx_ready_to_receive_req(uart_data->dtx->dlc_instance,
+                                                uart_data->dtx->to_send_data,
+                                                uart_data->dtx->write_pos,
+                                                uart_data->dtx->cur_desc_size);
+                /*
+                 * Reset the state of the Escape Sequence Detection
+                 */
+                dtx_set_esd_state( UART_ESD_NULL );
+              }
+              else
+              {
+                /*
+                 * escape characters are not removeable
+                 * so we will do this later
+                 */
+#ifdef _SIMULATION_
+                TRACE_EVENT("ESD: escape characters are not removeable");
+#endif /* _SIMULATION_ */
+                dtx_set_esd_state( UART_ESD_DETECTED );
+              }
+#ifdef _SIMULATION_
+              TRACE_EVENT_P3("+ + + dlc_instance: %d, silence %d \
+                             (from %d) Escape Sequence Detected + + + ",
+                             uart_data->dtx->dlc_instance,
+                             elapsed,
+                             uart_data->dtx->esd_guard_time);
+#endif /* _SIMULATION_ */
+
+              /*
+               * send detected escape sequence to MMI
+               */
+              sig_dtx_ker_escape_detected_ind(uart_data->dtx->dlc_instance);
+            }
+            break;
+
+          default:
+            {
+              TRACE_ERROR_P1("Error: wrong ESD state, uart_dtxs.c(%d)", __LINE__);
+            }
+            break;
+        }
+      }
+      else
+      {
+          TRACE_ERROR_P1("VSI entity: Cannot restart timer, uart_dtxs.c(%d)",
+                                                                   __LINE__);
+      }
+      break;
+
+    case DTX_NOT_READY:
+      if (vsi_t_time (VSI_CALLER &cur_time) EQ VSI_OK)
+      {
+        elapsed = cur_time - uart_data->dtx->esd_guard_time;
+        switch (dtx_get_esd_state())
+        {
+          case UART_ESD_DETECTED:
+          case UART_ESD_NULL:
+            break;
+
+          case UART_ESD_CHAR_1:
+          case UART_ESD_CHAR_2:
+            if(elapsed < uart_data->act_gp)
+            {
+              /*
+               * escape sequence guard period not complete: start timer
+               * with remaining time value
+               */
+              sig_dtx_rt_start_tesd_req (uart_data->act_gp - elapsed);
+            }
+            else
+            {
+              /*
+               * Guard Period complete
+               * reset detection because detected characters do not belong to
+               * an escape sequence
+               */
+              dtx_set_esd_state( UART_ESD_NULL );
+
+              /*
+               * if possible insert escape characters to usual data stream
+               */
+              if(uart_data->dtx->receiving_state EQ UART_DTX_NOT_RECEIVING)
+              {
+                /*
+                 * make escape character valid to send and insert values in
+                 * primitive
+                 */
+                uart_data->dtx->to_send_data->len    = uart_data->dtx->esd_pos;
+                uart_data->dtx->to_send_data->size   = uart_data->dtx->esd_pos;
+                uart_data->dtx->to_send_data->offset = 0;
+
+                if((uart_data->dtx->cur_desc_size -
+                    uart_data->dtx->esd_pos) >= uart_data->n1)
+                {
+                  /*
+                   * there is still enough space left to continue reception
+                   */
+                  sig_dtx_rx_ready_to_receive_req(
+                    uart_data->dtx->dlc_instance,
+                    uart_data->dtx->to_send_data,
+                    uart_data->dtx->write_pos,
+                    uart_data->dtx->cur_desc_size);
+                }
+
+              }
+            }
+            break;
+
+          case UART_ESD_CHAR_3:
+            if(elapsed < uart_data->act_gp)
+            {
+              /*
+               * escape sequence guard period not complete: start timer
+               * with remaining time value
+               */
+              sig_dtx_rt_start_tesd_req (uart_data->act_gp - elapsed);
+            }
+            else
+            {
+              /*
+               * Guard Period complete
+               * Escape Sequence detected
+               * store the occurence of the Escape Sequence
+               */
+#ifdef _SIMULATION_
+              TRACE_EVENT_P3("+ + + dlc_instance: %d, silence %d \
+                             (from %d) Escape Sequence Detected + + + ",
+                             uart_data->dtx->dlc_instance,
+                             elapsed,
+                             uart_data->dtx->esd_guard_time);
+#endif /* _SIMULATION_ */
+              /*
+               * remove escape characters from data stream
+               */
+              if(uart_data->dtx->receiving_state EQ UART_DTX_NOT_RECEIVING)
+              {
+                if(uart_data->dtx->write_pos > uart_data->dtx->esd_pos)
+                {
+                  memmove(
+                    &uart_data->dtx->to_send_data->buffer[
+                      uart_data->dtx->esd_pos - 3],
+                    &uart_data->dtx->to_send_data->buffer[
+                      uart_data->dtx->esd_pos],
+                    uart_data->dtx->write_pos - uart_data->dtx->esd_pos);
+                }
+                uart_data->dtx->write_pos-= 3;
+                uart_data->dtx->esd_pos  -= 3;
+                /*
+                 * Reset the state of the Escape Sequence Detection
+                 */
+                dtx_set_esd_state( UART_ESD_NULL );
+
+                if((uart_data->dtx->cur_desc_size -
+                    uart_data->dtx->esd_pos) >= uart_data->n1)
+                {
+                  /*
+                   * there is still enough space left to continue reception
+                   */
+                  sig_dtx_rx_ready_to_receive_req(
+                    uart_data->dtx->dlc_instance,
+                    uart_data->dtx->to_send_data,
+                    uart_data->dtx->write_pos,
+                    uart_data->dtx->cur_desc_size);
+                }
+              }
+              else
+              {
+                /*
+                 * escape characters are not removeable
+                 * so we will do this later
+                 */
+#ifdef _SIMULATION_
+                TRACE_EVENT("ESD: escape characters are not removeable");
+#endif /* _SIMULATION_ */
+                dtx_set_esd_state( UART_ESD_DETECTED );
+              }
+
+              /*
+               * send detected escape sequence to MMI
+               */
+              sig_dtx_ker_escape_detected_ind(uart_data->dtx->dlc_instance);
+            }
+            break;
+
+          default:
+            TRACE_ERROR("wrong esd state");
+            break;
+        }
+      }
+      break;
+
+    case DTX_DEAD:
+      break;
+
+    default:
+      TRACE_ERROR( "SIG_KER_DTX_TIMEOUT_TESD_REQ unexpected" );
+      break;
+  }
+} /* sig_ker_dtx_timeout_tesd_req() */