--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cs/layer1/gtt_include/l1gtt_baudot_functions.h	Fri Oct 16 06:23:26 2020 +0000
@@ -0,0 +1,145 @@
+/*****************************************************************************/
+/*                                                                           */
+/* ========================================================================= */
+/*                                                                           */
+/* 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