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Serial shifter helper.

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This commit is contained in:
Jean-François DEL NERO 2026-05-23 09:57:47 +02:00
parent 4a359adeaf
commit b4f320e8db
2 changed files with 135 additions and 0 deletions
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81
src/common/serial.c Normal file
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///////////////////////////////////////////////////////////////////////////////////
//-------------------------------------------------------------------------------//
//-------------------------------------------------------------------------------//
//-----------H----H--X----X-----CCCCC----22222----0000-----0000------11----------//
//----------H----H----X-X-----C--------------2---0----0---0----0--1--1-----------//
//---------HHHHHH-----X------C----------22222---0----0---0----0-----1------------//
//--------H----H----X--X----C----------2-------0----0---0----0-----1-------------//
//-------H----H---X-----X---CCCCC-----222222----0000-----0000----1111------------//
//-------------------------------------------------------------------------------//
//----------------------------------------------------- http://hxc2001.free.fr --//
///////////////////////////////////////////////////////////////////////////////////
// File : serial.c
// Contains: serial helpers
//
// This file is part of rf-tools.
//
// Written by: Jean-François DEL NERO
//
// Copyright (C) 2026 Jean-François DEL NERO
//
// You are free to do what you want with this code.
// A credit is always appreciated if you use it into your product :)
//
// Change History (most recent first):
///////////////////////////////////////////////////////////////////////////////////
#include <stdint.h>
#include <limits.h>
#include "serial.h"
void serial_init(serial_gen * ctx, int bitcnt, unsigned int sample_rate, unsigned int baud_rate)
{
ctx->bits_per_word = bitcnt;
ctx->start_bit_cnt = 0;
ctx->stop_bit_cnt = 0;
ctx->lsb_first = 0;
ctx->mask = 0;
ctx->sample_rate = sample_rate;
ctx->inc_acc = (uint32_t)( ( (uint64_t)(0xFFFFFFFF) * (uint64_t)baud_rate ) / (uint64_t)sample_rate );
ctx->acc = 0;
ctx->cur_bit = 0;
}
int serial_tx_getlinestate(serial_gen * ctx)
{
if ( ctx->acc > (((uint32_t)0xFFFFFFFF) - ctx->inc_acc) )
{
// Overflow... Next bit
ctx->cur_bit = ctx->tx_reg & ctx->mask;
// If mask == 0 -> shifter empty !
ctx->mask >>= 1;
}
ctx->acc += ctx->inc_acc;
if( ctx->cur_bit )
return 1;
else
return 0;
}
int serial_is_tx_reg_empty(serial_gen * ctx)
{
if(!ctx->mask)
return 1;
else
return 0;
}
void serial_tx_settxreg(serial_gen * ctx,uint32_t data)
{
ctx->mask = (0x1 << (ctx->bits_per_word - 1));
ctx->tx_reg = data;
}

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src/common/serial.h Normal file
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///////////////////////////////////////////////////////////////////////////////////
//-------------------------------------------------------------------------------//
//-------------------------------------------------------------------------------//
//-----------H----H--X----X-----CCCCC----22222----0000-----0000------11----------//
//----------H----H----X-X-----C--------------2---0----0---0----0--1--1-----------//
//---------HHHHHH-----X------C----------22222---0----0---0----0-----1------------//
//--------H----H----X--X----C----------2-------0----0---0----0-----1-------------//
//-------H----H---X-----X---CCCCC-----222222----0000-----0000----1111------------//
//-------------------------------------------------------------------------------//
//----------------------------------------------------- http://hxc2001.free.fr --//
///////////////////////////////////////////////////////////////////////////////////
// File : serial.h
// Contains: serial helpers
//
// This file is part of rf-tools.
//
// Written by: Jean-François DEL NERO
//
// Copyright (C) 2026 Jean-François DEL NERO
//
// You are free to do what you want with this code.
// A credit is always appreciated if you use it into your product :)
//
// Change History (most recent first):
///////////////////////////////////////////////////////////////////////////////////
#ifndef __SERIAL_H__
#define __SERIAL_H__
typedef struct serial_gen_
{
int bits_per_word;
int start_bit_cnt;
int stop_bit_cnt;
int lsb_first;
uint32_t sample_rate;
uint32_t baud_rate;
uint32_t mask;
uint32_t tx_reg;
uint32_t acc;
uint32_t inc_acc;
uint32_t cur_bit;
}serial_gen;
void serial_init(serial_gen * ctx, int bitcnt, unsigned int sample_rate, unsigned int baud_rate);
int serial_tx_getlinestate(serial_gen * ctx);
int serial_is_tx_reg_empty(serial_gen * ctx);
void serial_tx_settxreg(serial_gen * ctx,uint32_t data);
#endif