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Edward Emelianov
2026-04-08 23:48:23 +03:00
parent 0e9c7361b9
commit 9ef62c0d4d
33 changed files with 3320 additions and 1 deletions
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F1:F103/AS3935-lightning/spi.c Normal file
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/*
* This file is part of the as3935 project.
* Copyright 2026 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "spi.h"
#include "hardware.h"
#include "commproto.h"
// CR1 register default values
// Fpclk/64
static const uint32_t SPI_CR1 = SPI_CR1_MSTR | SPI_CR1_BR_2 | SPI_CR1_BR_0 | SPI_CR1_SSM | SPI_CR1_SSI | SPI_CR1_CPHA /* | SPI_CR1_CPOL*/;
spiStatus SPI_status = SPI_NOTREADY;
void spi_setup(){
// master, no slave select, BR=F/16, CPOL/CPHA - polarity.
SPI1->CR1 = SPI_CR1;
SPI_status = SPI_READY;
SPI1->CR1 |= SPI_CR1_SPE; // enable SPI
}
volatile uint32_t wctr;
#define WAITX(x) do{wctr = 0; while((x) && (++wctr < 360000)) IWDG->KR = IWDG_REFRESH; if(wctr==360000) return -1;}while(0)
/**
* @brief SPI_transmit - transmit data and receive new one
* @param buf - data to transmit/receive
* @param len - its length
* @return amount of transmitted data or -1 if error
*/
uint8_t SPI_transmit(uint8_t *buf, uint8_t len){
if(!buf || !len) return 0; // bad data format
if(SPI_status != SPI_READY) return 0; // spi not ready to transmit data
for(uint8_t x = 0; x < len; ++x){
WAITX(!(SPI1->SR & SPI_SR_TXE));
SPI1->DR = buf[x];
WAITX(!(SPI1->SR & SPI_SR_BSY));
WAITX(!(SPI1->SR & SPI_SR_RXNE));
buf[x] = SPI1->DR;
}
return len;
}