FreeCalypso > hg > fc-magnetite

annotate src/cs/layer1/gtt_include/l1gtt_baudot_functions.h @ 362:4c3d05866531

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FCHG: beginning of the new version
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 29 Dec 2017 07:06:06 +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