diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/sam3x8e/spi.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/src/sam3x8e/spi.c b/src/sam3x8e/spi.c index 791d71b3..3bbf6548 100644 --- a/src/sam3x8e/spi.c +++ b/src/sam3x8e/spi.c @@ -4,13 +4,10 @@ // // This file may be distributed under the terms of the GNU GPLv3 license. -#include <stddef.h> // NULL -#include "autoconf.h" +#include <sam3x8e.h> // REGPTR #include "command.h" // shutdown -#include "gpio.h" -#include "sched.h" -#include <sam3x8e.h> -#include <string.h> +#include "gpio.h" // gpio_peripheral +#include "sched.h" // sched_shutdown #define REGPTR SPI0 #define PERIPH_ID ID_SPI0 @@ -109,7 +106,8 @@ spi_transfer(struct spi_config config, uint8_t receive_data while (len--) { pSpi->SPI_TDR = *data; // wait for receive register - while (!(pSpi->SPI_SR & SPI_SR_RDRF)) { asm volatile("nop"); }; + while (!(pSpi->SPI_SR & SPI_SR_RDRF)) + ; // get data *data++ = pSpi->SPI_RDR; } @@ -117,7 +115,10 @@ spi_transfer(struct spi_config config, uint8_t receive_data while (len--) { pSpi->SPI_TDR = *data++; // wait for receive register - while (!(pSpi->SPI_SR & SPI_SR_RDRF)) { asm volatile("nop"); }; + while (!(pSpi->SPI_SR & SPI_SR_RDRF)) + ; + // read data (to clear RDRF) + pSpi->SPI_RDR; } } } |