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view src/cs/layer1/gtt_include/l1gtt_baudot_functions.h @ 394:fe200bd2f188
configs/*: converted to use scripts/config-headers-new.sh
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 17 Jan 2018 22:53:14 +0000 |
parents | 945cf7f506b2 |
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/*****************************************************************************/ /* */ /* ========================================================================= */ /* */ /* Copyright (c) 2002 */ /* Matsushita Communication Industrial, MMCD USA */ /* */ /* ========================================================================= */ /* */ /* File Name: */ /* l1gtt_baudot_functions.h */ /* */ /* Purpose: */ /* This is the header file for "l1gtt_baudot_functions.c". */ /* */ /* */ /* Warnings: */ /* */ /* */ /*****************************************************************************/ /*** Maintenance *********************************************************/ /* */ /* */ /* 02/11/2002 initial version created Laura Ning */ /* */ /*************************************************************************/ #ifndef _BAUDOT_DECODE_H_ #define BAUDOT_DECODE_H #include "ctm_typedefs.h" /* ******************************************************************************* * DEFINITIONS ******************************************************************************* */ /* definitions (might be of global interest) */ #define BAUDOT_NUM_INFO_BITS 5 /* number of info bits per TTY character */ #define BAUDOT_SHIFT_FIGURES 27 /* code of shift to figures symbol */ #define BAUDOT_SHIFT_LETTERS 31 /* code of shift to letters symbol */ #define BAUDOT_LOGICAL_1 1 #define BAUDOT_LOGICAL_0 -1 #define BAUDOT_NON_TTY 0 #define BAUDOT_START_BIT -1 #define BAUDOT_STOP_BIT 1 #define BAUDOT_STOP_OUTPUT 2 /* STOP bit as the output of baudot_encode() to DSP */ /* definations (be only of local interest) */ #define START_OF_STOP_BIT 26 #define DETECT_WINDOW_WIDTH 4 /* A sliding window is used to detect start,stop and data bits */ #define BAUDOT_SAMPLE_DURATION 3 /* The duration to meet to determine a valid baudot bit */ /* A temporary assumption of the input buffer size, to be */ /* replaced later when TI has the actual buffer size defined */ #define MAX_WORDS_OF_BUFFER1 40 /* Number of the 5ms-bits it can contain */ #define TIME_INTERVAL_OF_BUFFER1 200 /* in the unit of ms */ #define MAX_WORDS_ONE_TTYCODE 36 /* Number of 5ms-bits a TTY character has */ #define NUM_STOP_BITS_TX 2 /* number of stop bits per character */ /* ******************************************************************/ /* Type definitions for variables that contain all states of the */ /* Baudot decoder */ /* ******************************************************************/ typedef struct { WORD16 remainedSampleVec[MAX_WORDS_ONE_TTYCODE]; /* hold the samples for last unfinished detection */ UWORD16 remainedSampleLen; /* length of the remaining samples for last unfinished detection */ WORD16 ttyCode; UWORD16 cntBitsActualChar; UWORD16 samplesRemained; /* number of samples left from last detection */ BOOL startBitDetected; BOOL inFigureMode; } baudot_decode_state_t; /* ******************************************************************/ /* Type definitions for variables that contain all states of the */ /* Baudot encoder */ /* ******************************************************************/ typedef struct { WORD16 cntCharsSinceLastShift; BOOL inFigureMode; BOOL tailBitsGenerated; // fifo_state_t fifo_state; } baudot_encode_state_t; /****************************************************************************/ /* convertChar2ttyCode() */ /* ********************* */ /* Conversion from character into tty code */ /* */ /* input variables: */ /* - inChar charcater that shall be converted */ /* */ /* return value: baudot code of the input character */ /* or -1 in case that inChar is not valid (e.g. inChar=='\0')*/ /* */ /* Matthias Doerbecker, Ericsson Eurolab Deutschland (EED/N/RV), 2000/02/17 */ /****************************************************************************/ WORD16 convertChar2ttyCode(char inChar); /****************************************************************************/ /* convertTTYcode2char() */ /* ********************* */ /* Conversion from tty code into character */ /* */ /* input variables: */ /* - ttyCode Baudot code (must be within the range 0...63) */ /* or -1 if there is nothing to convert */ /* */ /* return value: character (or '\0' if ttyCode is not valid) */ /* */ /* Matthias Doerbecker, Ericsson Eurolab Deutschland (EED/N/RV), 2000/02/17 */ /****************************************************************************/ char convertTTYcode2char(WORD16 ttyCode); /* prototype declarations */ void init_baudot_decode(baudot_decode_state_t* state); void init_baudot_encode(baudot_encode_state_t* state); void reset_baudot_decode(baudot_decode_state_t* state); void baudot_decode(WORD16* sampleVec, WORD16 numSamples, fifo_state_t* ptrOutFifoState, baudot_decode_state_t* state); void baudot_encode(WORD16 inputTTYcode, fifo_state_t* ptrOutFifoState, baudot_encode_state_t* state); #endif