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cpu/stm32f4: made SPI driver thread safe

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This commit is contained in:
Hauke Petersen 2015-01-13 14:58:23 +01:00
parent f6a415a3d9
commit 70a5df67a5
1 changed files with 41 additions and 0 deletions
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41
cpu/stm32f4/periph/spi.c
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@ -15,6 +15,7 @@
*
* @author Peter Kietzmann <peter.kietzmann@haw-hamburg.de>
* @author Fabian Nack <nack@inf.fu-berlin.de>
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*
* @}
*/
@ -22,6 +23,7 @@
#include "board.h"
#include "cpu.h"
#include "mutex.h"
#include "periph/spi.h"
#include "periph_conf.h"
#include "thread.h"
@ -34,12 +36,18 @@
/* guard this file in case no SPI device is defined */
#if SPI_NUMOF
/**
* @brief Data-structure holding the state for a SPI device
*/
typedef struct {
char(*cb)(char data);
} spi_state_t;
static inline void irq_handler_transfer(SPI_TypeDef *spi, spi_t dev);
/**
* @brief Reserve memory for saving the SPI device's state
*/
static spi_state_t spi_config[SPI_NUMOF];
/* static bus div mapping */
@ -55,6 +63,21 @@ static const uint8_t spi_bus_div_map[SPI_NUMOF] = {
#endif
};
/**
* @brief Array holding one pre-initialized mutex for each SPI device
*/
static mutex_t locks[] = {
#if SPI_0_EN
[SPI_0] = MUTEX_INIT,
#endif
#if SPI_1_EN
[SPI_1] = MUTEX_INIT,
#endif
#if SPI_2_EN
[SPI_2] = MUTEX_INIT
#endif
};
int spi_init_master(spi_t dev, spi_conf_t conf, spi_speed_t speed)
{
uint8_t speed_devider;
@ -270,6 +293,24 @@ int spi_conf_pins(spi_t dev)
return 0;
}
int spi_acquire(spi_t dev)
{
if (dev >= SPI_NUMOF) {
return -1;
}
mutex_lock(&locks[dev]);
return 0;
}
int spi_release(spi_t dev)
{
if (dev >= SPI_NUMOF) {
return -1;
}
mutex_unlock(&locks[dev]);
return 0;
}
int spi_transfer_byte(spi_t dev, char out, char *in)
{
SPI_TypeDef *spi_port;