FreeCalypso > hg > fc-magnetite
annotate src/cs/layer1/gtt_include/l1gtt_baudot_functions.h @ 488:ff91db8c9eb8
OSL: os_com_fl.c compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 22 Jun 2018 06:38:03 +0000 |
parents | 945cf7f506b2 |
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rev | line source |
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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 |