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stm32f0: spi: move to platform-specific directory

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This commit is contained in:
S.J.R. van Schaik 2017-07-27 15:28:25 +02:00
parent 73788ae5e6
commit 907175bd37
3 changed files with 1 additions and 1 deletions
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1
source/platform/stm32f0/Makefile
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@ -1,3 +1,4 @@
obj-y += source/platform/stm32f0/gpio.o
obj-y += source/platform/stm32f0/rcc.o
obj-y += source/platform/stm32f0/rtc.o
obj-y += source/platform/stm32f0/spi.o

79
source/platform/stm32f0/spi.c Normal file
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@ -0,0 +1,79 @@
#define _GNU_SOURCE
#include <stdint.h>
#include <stdlib.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/spi.h>
#include <libopencm3/stm32/usart.h>
#include <spi.h>
static int stm32f0_spi_tx_rx(struct spi_dev *dev, void *rx_buf, size_t rx_len,
const void *tx_buf, size_t tx_len);
static struct spi_ops stm32f0_spi_ops = {
.tx_rx = stm32f0_spi_tx_rx,
};
static void stm32f0_spi_init(void)
{
spi_set_master_mode(SPI1);
spi_set_baudrate_prescaler(SPI1, SPI_CR1_BR_FPCLK_DIV_64);
spi_set_clock_polarity_0(SPI1);
spi_set_clock_phase_0(SPI1);
spi_set_full_duplex_mode(SPI1);
spi_set_unidirectional_mode(SPI1); /* bidirectional but in 3-wire */
spi_set_data_size(SPI1, SPI_CR2_DS_8BIT);
spi_enable_software_slave_management(SPI1);
spi_send_msb_first(SPI1);
spi_set_nss_high(SPI1);
spi_fifo_reception_threshold_8bit(SPI1);
SPI_I2SCFGR(SPI1) &= ~SPI_I2SCFGR_I2SMOD;
spi_enable(SPI1);
}
struct spi_dev *spi_probe(void)
{
struct spi_dev *dev;
if (!(dev = malloc(sizeof *dev)))
return NULL;
dev->ops = &stm32f0_spi_ops;
dev->dev_id = SPI1;
stm32f0_spi_init();
return dev;
}
void spi_release(struct spi_dev *dev)
{
free(dev);
}
static int stm32f0_spi_tx_rx(struct spi_dev *dev, void *rx_buf, size_t rx_len,
const void *tx_buf, size_t tx_len)
{
char *rx = rx_buf;
const char *tx = tx_buf;
size_t i;
gpio_clear(GPIOB, GPIO6);
for (i = 0; i < tx_len; ++i) {
spi_send8(dev->dev_id, *tx++);
(void)spi_read8(dev->dev_id);
}
if (rx_buf) {
for (i = 0; i < rx_len; ++i) {
spi_send8(dev->dev_id, 0);
*rx++ = spi_read8(dev->dev_id);
}
}
gpio_set(GPIOB, GPIO6);
return 0;
}