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stm32l1: 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 3292987516
commit d68b4ef6c2
1 changed files with 35 additions and 0 deletions
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35
cpu/stm32l1/periph/spi.c
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@ -17,11 +17,13 @@
* @author Hauke Petersen <mail@haukepetersen.de>
* @author Fabian Nack <nack@inf.fu-berlin.de>
* @author Thomas Eichinger <thomas.eichinger@fu-berlin.de>
* @author Joakim Gebart <joakim.gebart@eistec.se>
*
* @}
*/
#include "cpu.h"
#include "mutex.h"
#include "periph/spi.h"
#include "periph_conf.h"
#include "thread.h"
@ -30,6 +32,21 @@
/* guard file in case no SPI device is defined */
#if 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)
{
SPI_TypeDef *spi;
@ -138,6 +155,24 @@ 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)
{
char tmp;