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SPI works, may say it's over

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This commit is contained in:
Edward Emelianov
2026-03-18 23:49:29 +03:00
parent c80f0884f5
commit e2a20a046a
12 changed files with 515 additions and 52 deletions
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21
F0:F030,F042,F072/usbcan_gpio/spi.c
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@@ -18,6 +18,7 @@
#include <stm32f0.h>
#include "flash.h"
#include "hardware.h"
#include "spi.h"
@@ -38,14 +39,20 @@ static uint16_t get_baudrate_prescaler(uint32_t speed_hz){
}
// Master, 8bit, CPOL=0, CPHA=0, MSB first
void spi_setup(uint32_t speed){ // speed in Hz
void spi_setup(){
RCC->APB2RSTR |= RCC_APB2RSTR_SPI1RST;
RCC->APB2RSTR = 0;
SPI1->CR1 = 0;
uint16_t br = get_baudrate_prescaler(speed);
SPI1->CR1 = SPI_CR1_MSTR | (br << 3) | SPI_CR1_SSM | SPI_CR1_SSI;
SPI1->CR2 = SPI_CR2_SSOE;
uint16_t br = get_baudrate_prescaler(the_conf.spiconfig.speed);
uint32_t cr1 = SPI_CR1_MSTR | (br << 3) | SPI_CR1_SSM | SPI_CR1_SSI;
if(the_conf.spiconfig.cpol) cr1 |= SPI_CR1_CPOL;
if(the_conf.spiconfig.cpha) cr1 |= SPI_CR1_CPHA;
if(the_conf.spiconfig.lsbfirst) cr1 |= SPI_CR1_LSBFIRST;
// there would be a lot of problem to set rxonly!
//if(the_conf.spiconfig.rxonly) cr1 |= SPI_CR1_RXONLY;
SPI1->CR1 = cr1;
// rxne after 8bits, ds 8bit
SPI1->CR2 = /*SPI_CR2_SSOE | */ SPI_CR2_FRXTH| SPI_CR2_DS_2|SPI_CR2_DS_1|SPI_CR2_DS_0;
SPI1->CR1 |= SPI_CR1_SPE;
}
@@ -63,12 +70,12 @@ int spi_transfer(const uint8_t *tx, uint8_t *rx, int len){
if (--timeout == 0) return -1; // error by timeout: TX isn't ready
}
uint8_t out = (tx) ? tx[i] : 0;
*(uint8_t*)&SPI1->DR = out; // ÚÁÐÉÓØ × DR
*((volatile uint8_t*)&SPI1->DR) = out;
timeout = 1000000;
while(!(SPI1->SR & SPI_SR_RXNE)){
if(--timeout == 0) return 0;
}
uint8_t in = *(uint8_t*)&SPI1->DR; // ÞÔÅÎÉÅ ÉÚ DR
uint8_t in = *((volatile uint8_t*)&SPI1->DR);
if(rx) rx[i] = in;
}
//while(SPI1->SR & SPI_SR_BSY){ }