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stm32f3: Basic implementation of spi_acquire(), spi_release()

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Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>
This commit is contained in:
Joakim Gebart 2015-01-16 13:38:02 +01:00
parent f64c54bf66
commit 3292987516
1 changed files with 35 additions and 0 deletions
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35
cpu/stm32f3/periph/spi.c
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@ -17,6 +17,7 @@
* @author Peter Kietzmann <peter.kietzmann@haw-hamburg.de> * @author Peter Kietzmann <peter.kietzmann@haw-hamburg.de>
* @author Fabian Nack <nack@inf.fu-berlin.de> * @author Fabian Nack <nack@inf.fu-berlin.de>
* @author Hauke Petersen <hauke.petersen@fu-berlin.de> * @author Hauke Petersen <hauke.petersen@fu-berlin.de>
* @author Joakim Gebart <joakim.gebart@eistec.se>
* *
* @} * @}
*/ */
@ -24,6 +25,7 @@
#include "board.h" #include "board.h"
#include "cpu.h" #include "cpu.h"
#include "mutex.h"
#include "periph/spi.h" #include "periph/spi.h"
#include "periph_conf.h" #include "periph_conf.h"
#include "thread.h" #include "thread.h"
@ -57,6 +59,21 @@ static inline void irq_handler_transfer(SPI_TypeDef *spi, spi_t dev);
static spi_state_t spi_config[SPI_NUMOF]; static spi_state_t spi_config[SPI_NUMOF];
/**
* @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) int spi_init_master(spi_t dev, spi_conf_t conf, spi_speed_t speed)
{ {
uint8_t speed_divider; uint8_t speed_divider;
@ -262,6 +279,24 @@ int spi_conf_pins(spi_t dev)
return 0; 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) int spi_transfer_byte(spi_t dev, char out, char *in)
{ {
if (dev >= SPI_NUMOF) { if (dev >= SPI_NUMOF) {