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view src/cs/layer1/gtt_include/ctm/viterbi.h @ 629:3231dd9b38c1

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armio.c: make GPIOs 8 & 13 outputs driving 1 on all "classic" targets Calypso GPIOs 8 & 13 are pinmuxed with MCUEN1 & MCUEN2, respectively, and on powerup these pins are MCUEN, i.e., outputs driving 1. TI's code for C-Sample and earlier turns them into GPIOs configured as outputs also driving 1 - so far, so good - but TI's code for BOARD 41 (which covers D-Sample, Leonardo and all real world Calypso devices derived from the latter) switches them from MCUEN to GPIOs, but then leaves them as inputs. Given that the hardware powerup state of these two pins is outputs driving 1, every Calypso board design MUST be compatible with such driving; typically these GPIO signals will be either unused and unconnected or connected as outputs driving some peripheral. Turning these pins into GPIO inputs will result in floating inputs on every reasonably-wired board, thus I am convinced that this configuration is nothing but a bug on the part of whoever wrote this code at TI. This floating input bug had already been fixed earlier for GTA modem and FCDEV3B targets; the present change makes the fix unconditional for all "classic" targets. The newly affected targets are D-Sample, Leonardo, Tango and GTM900.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 02 Jan 2020 05:38:26 +0000
parents 945cf7f506b2
children
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/*
*******************************************************************************
*
*      COPYRIGHT (C) 2000 BY ERICSSON EUROLAB DEUTSCHLAND GmbH
*
*      The program(s) may be used and/or copied only with the
*      written permission from Ericsson or in accordance
*      with the terms and conditions stipulated in the agreement or
*      contract under which the program(s) have been supplied.
*
*******************************************************************************
*
*      File             : viterbi.h
*      Purpose          : Header file for viterbi.c
*      Author           : Francisco Javier Gil Gomez
*
*      Revision history
*
*      $Log: $
*
*******************************************************************************
*/

#ifndef viterbi_h
#define viterbi_h "$Id: $"

#include <stdio.h>
#include <math.h>

#include "conv_poly.h"   /* definition of viterbi_t */


/***********************************************************************/
/* viterbi_init()                                                      */
/* **************                                                      */
/* Initialization of the Viterbi decoder.                              */
/*                                                                     */
/* output variables:                                                   */
/* *viterbi_state   initialized state variable of the decoder          */
/*                                                                     */
/***********************************************************************/

void viterbi_init(viterbi_t* viterbi_state);


/***********************************************************************/
/* viterbi_reinit()                                                    */
/* ****************                                                    */
/* Re-Initialization of the Viterbi decoder. This function should be   */
/* used for re-setting a Viterbi decoder that has already been         */
/* initialized. In contrast to viterbi_init(), this reinit function    */
/* does not calculate the values of all members of viterbi_state that  */
/* do not change during the execution of the Viterbi algorithm.        */
/*                                                                     */
/* output variables:                                                   */
/* *viterbi_state   initialized state variable of the decoder          */
/*                                                                     */
/***********************************************************************/

void viterbi_reinit(viterbi_t* viterbi_state);


/***********************************************************************/
/* viterbi_exec()                                                      */
/* **************                                                      */
/* Execution of the Viterbi decoder                                    */
/*                                                                     */
/* input variables:                                                    */
/* inputword            Vector with gross bits                         */
/* length_input         Number of valid gross bits in vector inputword.*/
/*                      length_input must be an integer multiple of    */
/*                      CHC_RATE                                       */
/*                                                                     */
/* output variables:                                                   */
/* out                  Vector with the decoded net bits. The net bits */
/*                      are either 0 or 1.                             */
/* *num_valid_out_bits  Number of valid bits in vector out             */
/*                                                                     */
/* input/output variables:                                             */
/* *viterbi_state       State variable of the decoder                  */
/*                                                                     */
/***********************************************************************/

void viterbi_exec(WORD16*  inputword, WORD16  length_input, 
                  WORD16*  out,       WORD16* num_valid_out_bits,
                  viterbi_t* viterbi_state);

#endif