FreeCalypso > hg > fc-magnetite

annotate src/cs/layer1/gtt_include/l1gtt_baudot_functions.h @ 632:d968a3216ba0

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new tangomdm build target TCS211/Magnetite built for target leonardo runs just fine on the Tango-based Caramel board, but a more proper tangomdm build target is preferable in order to better market these Tango modems to prospective commercial customers. The only differences are in GPIO and MCSI config: * MCSI is enabled in the tangomdm build config. * GPIO 1 is loudspeaker amplifier control on Leonardo, but on Tango platforms it can be used for anything. On Caramel boards this GPIO should be configured as an output driving high. * GPIO 2 needs to be configured as Calypso input on Leonardo, but on Tango platforms it can be used for anything. On Caramel boards this GPIO should be configured as an output, either high or low is OK.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 04 Jan 2020 19:27:41 +0000
parents 945cf7f506b2
children
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1 /*****************************************************************************/
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2 /* */
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3 /* ========================================================================= */
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4 /* */
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5 /* Copyright (c) 2002 */
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6 /* Matsushita Communication Industrial, MMCD USA */
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7 /* */
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8 /* ========================================================================= */
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9 /* */
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10 /* File Name: */
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11 /* l1gtt_baudot_functions.h */
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12 /* */
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13 /* Purpose: */
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14 /* This is the header file for "l1gtt_baudot_functions.c". */
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15 /* */
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16 /* */
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17 /* Warnings: */
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18 /* */
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19 /* */
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20 /*****************************************************************************/
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21
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22 /*** Maintenance *********************************************************/
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23 /* */
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24 /* */
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25 /* 02/11/2002 initial version created Laura Ning */
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26 /* */
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27 /*************************************************************************/
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28 #ifndef _BAUDOT_DECODE_H_
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29 #define BAUDOT_DECODE_H
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30
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31 #include "ctm_typedefs.h"
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32
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33 /*
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34 *******************************************************************************
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35 * DEFINITIONS
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36 *******************************************************************************
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37 */
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38
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39 /* definitions (might be of global interest) */
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40 #define BAUDOT_NUM_INFO_BITS 5 /* number of info bits per TTY character */
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41 #define BAUDOT_SHIFT_FIGURES 27 /* code of shift to figures symbol */
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42 #define BAUDOT_SHIFT_LETTERS 31 /* code of shift to letters symbol */
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43
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44 #define BAUDOT_LOGICAL_1 1
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45 #define BAUDOT_LOGICAL_0 -1
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46 #define BAUDOT_NON_TTY 0
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47 #define BAUDOT_START_BIT -1
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48 #define BAUDOT_STOP_BIT 1
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49
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50 #define BAUDOT_STOP_OUTPUT 2 /* STOP bit as the output of baudot_encode() to DSP */
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51
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52 /* definations (be only of local interest) */
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53
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54 #define START_OF_STOP_BIT 26
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55
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56 #define DETECT_WINDOW_WIDTH 4 /* A sliding window is used to detect start,stop and data bits */
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57 #define BAUDOT_SAMPLE_DURATION 3 /* The duration to meet to determine a valid baudot bit */
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58
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59 /* A temporary assumption of the input buffer size, to be */
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60 /* replaced later when TI has the actual buffer size defined */
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61 #define MAX_WORDS_OF_BUFFER1 40 /* Number of the 5ms-bits it can contain */
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62 #define TIME_INTERVAL_OF_BUFFER1 200 /* in the unit of ms */
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63 #define MAX_WORDS_ONE_TTYCODE 36 /* Number of 5ms-bits a TTY character has */
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64
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65 #define NUM_STOP_BITS_TX 2 /* number of stop bits per character */
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66
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67 /* ******************************************************************/
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68 /* Type definitions for variables that contain all states of the */
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69 /* Baudot decoder */
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70 /* ******************************************************************/
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71
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72
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73 typedef struct
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74 {
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75 WORD16 remainedSampleVec[MAX_WORDS_ONE_TTYCODE]; /* hold the samples for last unfinished detection */
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76 UWORD16 remainedSampleLen; /* length of the remaining samples for last unfinished detection */
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77 WORD16 ttyCode;
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78 UWORD16 cntBitsActualChar;
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79 UWORD16 samplesRemained; /* number of samples left from last detection */
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80 BOOL startBitDetected;
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81 BOOL inFigureMode;
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82
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83 } baudot_decode_state_t;
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84
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85 /* ******************************************************************/
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86 /* Type definitions for variables that contain all states of the */
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87 /* Baudot encoder */
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88 /* ******************************************************************/
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89 typedef struct
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90 {
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91 WORD16 cntCharsSinceLastShift;
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92 BOOL inFigureMode;
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93 BOOL tailBitsGenerated;
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94 // fifo_state_t fifo_state;
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95 } baudot_encode_state_t;
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96
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97 /****************************************************************************/
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98 /* convertChar2ttyCode() */
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99 /* ********************* */
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100 /* Conversion from character into tty code */
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101 /* */
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102 /* input variables: */
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103 /* - inChar charcater that shall be converted */
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104 /* */
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105 /* return value: baudot code of the input character */
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106 /* or -1 in case that inChar is not valid (e.g. inChar=='\0')*/
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107 /* */
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108 /* Matthias Doerbecker, Ericsson Eurolab Deutschland (EED/N/RV), 2000/02/17 */
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109 /****************************************************************************/
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110
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111 WORD16 convertChar2ttyCode(char inChar);
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112
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113
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114
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115 /****************************************************************************/
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116 /* convertTTYcode2char() */
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117 /* ********************* */
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118 /* Conversion from tty code into character */
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119 /* */
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120 /* input variables: */
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121 /* - ttyCode Baudot code (must be within the range 0...63) */
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122 /* or -1 if there is nothing to convert */
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123 /* */
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124 /* return value: character (or '\0' if ttyCode is not valid) */
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125 /* */
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126 /* Matthias Doerbecker, Ericsson Eurolab Deutschland (EED/N/RV), 2000/02/17 */
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127 /****************************************************************************/
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128
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129 char convertTTYcode2char(WORD16 ttyCode);
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130
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131 /* prototype declarations */
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132 void init_baudot_decode(baudot_decode_state_t* state);
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133
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134 void init_baudot_encode(baudot_encode_state_t* state);
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135
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136 void reset_baudot_decode(baudot_decode_state_t* state);
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137
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138 void baudot_decode(WORD16* sampleVec, WORD16 numSamples,
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139 fifo_state_t* ptrOutFifoState,
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140 baudot_decode_state_t* state);
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141 void baudot_encode(WORD16 inputTTYcode,
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142 fifo_state_t* ptrOutFifoState,
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143 baudot_encode_state_t* state);
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144
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145 #endif