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comparison src/cs/layer1/gtt_include/l1gtt_baudot_functions.h @ 0:4e78acac3d88

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src/{condat,cs,gpf,nucleus}: import from Selenite
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 16 Oct 2020 06:23:26 +0000
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1 /*****************************************************************************/
2 /* */
3 /* ========================================================================= */
4 /* */
5 /* Copyright (c) 2002 */
6 /* Matsushita Communication Industrial, MMCD USA */
7 /* */
8 /* ========================================================================= */
9 /* */
10 /* File Name: */
11 /* l1gtt_baudot_functions.h */
12 /* */
13 /* Purpose: */
14 /* This is the header file for "l1gtt_baudot_functions.c". */
15 /* */
16 /* */
17 /* Warnings: */
18 /* */
19 /* */
20 /*****************************************************************************/
21
22 /*** Maintenance *********************************************************/
23 /* */
24 /* */
25 /* 02/11/2002 initial version created Laura Ning */
26 /* */
27 /*************************************************************************/
28 #ifndef _BAUDOT_DECODE_H_
29 #define BAUDOT_DECODE_H
30
31 #include "ctm_typedefs.h"
32
33 /*
34 *******************************************************************************
35 * DEFINITIONS
36 *******************************************************************************
37 */
38
39 /* definitions (might be of global interest) */
40 #define BAUDOT_NUM_INFO_BITS 5 /* number of info bits per TTY character */
41 #define BAUDOT_SHIFT_FIGURES 27 /* code of shift to figures symbol */
42 #define BAUDOT_SHIFT_LETTERS 31 /* code of shift to letters symbol */
43
44 #define BAUDOT_LOGICAL_1 1
45 #define BAUDOT_LOGICAL_0 -1
46 #define BAUDOT_NON_TTY 0
47 #define BAUDOT_START_BIT -1
48 #define BAUDOT_STOP_BIT 1
49
50 #define BAUDOT_STOP_OUTPUT 2 /* STOP bit as the output of baudot_encode() to DSP */
51
52 /* definations (be only of local interest) */
53
54 #define START_OF_STOP_BIT 26
55
56 #define DETECT_WINDOW_WIDTH 4 /* A sliding window is used to detect start,stop and data bits */
57 #define BAUDOT_SAMPLE_DURATION 3 /* The duration to meet to determine a valid baudot bit */
58
59 /* A temporary assumption of the input buffer size, to be */
60 /* replaced later when TI has the actual buffer size defined */
61 #define MAX_WORDS_OF_BUFFER1 40 /* Number of the 5ms-bits it can contain */
62 #define TIME_INTERVAL_OF_BUFFER1 200 /* in the unit of ms */
63 #define MAX_WORDS_ONE_TTYCODE 36 /* Number of 5ms-bits a TTY character has */
64
65 #define NUM_STOP_BITS_TX 2 /* number of stop bits per character */
66
67 /* ******************************************************************/
68 /* Type definitions for variables that contain all states of the */
69 /* Baudot decoder */
70 /* ******************************************************************/
71
72
73 typedef struct
74 {
75 WORD16 remainedSampleVec[MAX_WORDS_ONE_TTYCODE]; /* hold the samples for last unfinished detection */
76 UWORD16 remainedSampleLen; /* length of the remaining samples for last unfinished detection */
77 WORD16 ttyCode;
78 UWORD16 cntBitsActualChar;
79 UWORD16 samplesRemained; /* number of samples left from last detection */
80 BOOL startBitDetected;
81 BOOL inFigureMode;
82
83 } baudot_decode_state_t;
84
85 /* ******************************************************************/
86 /* Type definitions for variables that contain all states of the */
87 /* Baudot encoder */
88 /* ******************************************************************/
89 typedef struct
90 {
91 WORD16 cntCharsSinceLastShift;
92 BOOL inFigureMode;
93 BOOL tailBitsGenerated;
94 // fifo_state_t fifo_state;
95 } baudot_encode_state_t;
96
97 /****************************************************************************/
98 /* convertChar2ttyCode() */
99 /* ********************* */
100 /* Conversion from character into tty code */
101 /* */
102 /* input variables: */
103 /* - inChar charcater that shall be converted */
104 /* */
105 /* return value: baudot code of the input character */
106 /* or -1 in case that inChar is not valid (e.g. inChar=='\0')*/
107 /* */
108 /* Matthias Doerbecker, Ericsson Eurolab Deutschland (EED/N/RV), 2000/02/17 */
109 /****************************************************************************/
110
111 WORD16 convertChar2ttyCode(char inChar);
112
113
114
115 /****************************************************************************/
116 /* convertTTYcode2char() */
117 /* ********************* */
118 /* Conversion from tty code into character */
119 /* */
120 /* input variables: */
121 /* - ttyCode Baudot code (must be within the range 0...63) */
122 /* or -1 if there is nothing to convert */
123 /* */
124 /* return value: character (or '\0' if ttyCode is not valid) */
125 /* */
126 /* Matthias Doerbecker, Ericsson Eurolab Deutschland (EED/N/RV), 2000/02/17 */
127 /****************************************************************************/
128
129 char convertTTYcode2char(WORD16 ttyCode);
130
131 /* prototype declarations */
132 void init_baudot_decode(baudot_decode_state_t* state);
133
134 void init_baudot_encode(baudot_encode_state_t* state);
135
136 void reset_baudot_decode(baudot_decode_state_t* state);
137
138 void baudot_decode(WORD16* sampleVec, WORD16 numSamples,
139 fifo_state_t* ptrOutFifoState,
140 baudot_decode_state_t* state);
141 void baudot_encode(WORD16 inputTTYcode,
142 fifo_state_t* ptrOutFifoState,
143 baudot_encode_state_t* state);
144
145 #endif