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Driver for STM32F4xx SPI peripherals

This commit is contained in:
Silvano Seva 2024-05-26 20:14:45 +02:00
parent 07ee9a3369
commit 8fff2e7361
3 changed files with 243 additions and 0 deletions
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1
meson.build
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@ -213,6 +213,7 @@ stm32f405_src = ['platform/mcu/STM32F4xx/boot/startup.cpp',
'platform/mcu/STM32F4xx/drivers/flash.c',
'platform/mcu/STM32F4xx/drivers/rng.c',
'platform/mcu/STM32F4xx/drivers/i2c_stm32.c',
'platform/mcu/STM32F4xx/drivers/spi_stm32.c',
'platform/drivers/audio/stm32_dac.cpp',
'platform/drivers/audio/stm32_adc.cpp',
'platform/drivers/audio/stm32_pwm.cpp',

179
platform/mcu/STM32F4xx/drivers/spi_stm32.c Normal file
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@ -0,0 +1,179 @@
/***************************************************************************
* Copyright (C) 2021 - 2024 by Federico Amedeo Izzo IU2NUO, *
* Niccolò Izzo IU2KIN *
* Frederik Saraci IU2NRO *
* Silvano Seva IU2KWO *
* *
* 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 <errno.h>
#include <stm32f4xx.h>
#include "spi_stm32.h"
static inline uint8_t spi_sendRecv(SPI_TypeDef *spi, const uint8_t val)
{
spi->DR = val;
while((spi->SR & SPI_SR_RXNE) == 0) ;
return spi->DR;
}
int spi_init(const struct spiDevice *dev, const uint32_t speed, const uint8_t flags)
{
SPI_TypeDef *spi = (SPI_TypeDef *) dev->priv;
uint32_t clkDiv = 0;
switch((uint32_t) spi)
{
case SPI1_BASE:
clkDiv = (RCC->CFGR >> 13) & 0x07;
RCC->APB2ENR |= RCC_APB2ENR_SPI1EN;
__DSB();
break;
case SPI2_BASE:
clkDiv = (RCC->CFGR >> 10) & 0x07;
RCC->APB1ENR |= RCC_APB1ENR_SPI2EN;
__DSB();
break;
case SPI3_BASE:
clkDiv = (RCC->CFGR >> 10) & 0x07;
RCC->APB1ENR |= RCC_APB1ENR_SPI3EN;
__DSB();
break;
default:
return -ENODEV;
break;
}
uint32_t apbClk = SystemCoreClock;
if((clkDiv & 0x04) != 0)
apbClk /= (1 << ((clkDiv & 0x03) + 1));
uint8_t spiDiv;
uint32_t spiClk;
for(spiDiv = 0; spiDiv < 7; spiDiv += 1)
{
spiClk = apbClk / (1 << (spiDiv + 1));
if(spiClk <= speed)
break;
}
if(spiClk > speed)
return -EINVAL;
spi->CR1 = SPI_CR1_SSM // Software managment of nCS
| SPI_CR1_SSI // Force internal nCS
| (spiDiv << 3) // Baud rate
| SPI_CR1_MSTR; // Master mode
if((flags & SPI_FLAG_CPOL) != 0)
spi->CR1 |= SPI_CR1_CPOL;
if((flags & SPI_FLAG_CPHA) != 0)
spi->CR1 |= SPI_CR1_CPHA;
if((flags & SPI_LSB_FIRST) != 0)
spi->CR1 |= SPI_CR1_LSBFIRST;
spi->CR1 |= SPI_CR1_SPE; // Enable peripheral
if(dev->mutex != NULL)
pthread_mutex_init((pthread_mutex_t *) dev->mutex, NULL);
return 0;
}
void spi_terminate(const struct spiDevice *dev)
{
SPI_TypeDef *spi = (SPI_TypeDef *) dev->priv;
switch((uint32_t) spi)
{
case SPI1_BASE:
RCC->APB2ENR &= ~RCC_APB2ENR_SPI1EN;
__DSB();
break;
case SPI2_BASE:
RCC->APB1ENR &= ~RCC_APB1ENR_SPI2EN;
__DSB();
break;
case SPI3_BASE:
RCC->APB1ENR &= ~RCC_APB1ENR_SPI3EN;
__DSB();
break;
}
if(dev->mutex != NULL)
pthread_mutex_destroy((pthread_mutex_t *) dev->mutex);
}
int spiStm32_transfer(const struct spiDevice *dev, const void *txBuf,
const size_t txSize, void *rxBuf, const size_t rxSize)
{
SPI_TypeDef *spi = (SPI_TypeDef *) dev->priv;
uint8_t *rxData = (uint8_t *) rxBuf;
const uint8_t *txData = (const uint8_t *) txBuf;
// Send only
if((rxBuf == NULL) || (rxSize == 0))
{
for(size_t i = 0; i < txSize; i++)
spi_sendRecv(spi, txData[i]);
return 0;
}
// Receive only
if((txBuf == NULL) || (txSize == 0))
{
for(size_t i = 0; i < rxSize; i++)
rxData[i] = spi_sendRecv(spi, 0x00);
return 0;
}
// Transmit and receive
size_t txRxSize = (txSize < rxSize) ? txSize : rxSize;
for(size_t i = 0; i < txRxSize; i++)
rxData[i] = spi_sendRecv(spi, txData[i]);
// Still something to send?
if(txSize > txRxSize)
{
for(size_t i = 0; i < (txSize - txRxSize); i++)
{
size_t pos = txRxSize + i;
spi_sendRecv(spi, txData[pos]);
}
}
// Still something to receive?
if(rxSize > txRxSize)
{
for(size_t i = 0; i < (rxSize - txRxSize); i++)
{
size_t pos = txRxSize + i;
rxData[pos] = spi_sendRecv(spi, 0x00);
}
}
return 0;
}

63
platform/mcu/STM32F4xx/drivers/spi_stm32.h Normal file
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@ -0,0 +1,63 @@
/***************************************************************************
* Copyright (C) 2021 - 2024 by Federico Amedeo Izzo IU2NUO, *
* Niccolò Izzo IU2KIN *
* Frederik Saraci IU2NRO *
* Silvano Seva IU2KWO *
* *
* 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/> *
***************************************************************************/
#ifndef SPI_STM32_H
#define SPI_STM32_H
#include <peripherals/spi.h>
/**
* Instantiate an STM32 I2C master device.
*
* @param name: device name.
* @param peripheral: underlying MCU peripheral.
* @param mutx: pointer to mutex, or NULL.
*/
#define SPI_STM32_DEVICE_DEFINE(name, peripheral, mutx) \
extern int spiStm32_transfer(const struct spiDevice *dev, const void *txBuf, \
const size_t txSize, void *rxBuf, \
const size_t rxSize); \
const struct spiDevice name = \
{ \
.transfer = &spiStm32_transfer, \
.priv = peripheral, \
.mutex = mutx \
};
/**
* Initialise an SPI peripheral and driver.
* Is left to application code to change the operating mode and alternate function
* mapping of the corresponding gpio lines.
*
* @param dev: SPI device descriptor.
* @param speed: SPI clock speed.
* @param flags: SPI configuration flags.
* @return zero on success, a negative error code otherwise.
*/
int spi_init(const struct spiDevice *dev, const uint32_t speed, const uint8_t flags);
/**
* Shut down an SPI peripheral and driver.
*
* @param dev: SPI device descriptor.
*/
void spi_terminate(const struct spiDevice *dev);
#endif /* SPI_STM32_H */