diff options
Diffstat (limited to 'src/ao_spi.c')
| -rw-r--r-- | src/ao_spi.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/src/ao_spi.c b/src/ao_spi.c index bd52a0d4..fbe613c7 100644 --- a/src/ao_spi.c +++ b/src/ao_spi.c @@ -17,6 +17,10 @@ #include "ao.h" +/* Shared mutex to protect SPI bus, must cover the entire + * operation, from CS low to CS high. This means that any SPI + * user must protect the SPI bus with this mutex + */ __xdata uint8_t ao_spi_mutex; __xdata uint8_t ao_spi_dma_in_done; __xdata uint8_t ao_spi_dma_out_done; @@ -36,7 +40,6 @@ static __xdata uint8_t ao_spi_const = 0xff; void ao_spi_send(void __xdata *block, uint16_t len) __reentrant { - ao_mutex_get(&ao_spi_mutex); ao_dma_set_transfer(ao_spi_dma_in_id, &U0DBUFXADDR, &ao_spi_const, @@ -64,7 +67,6 @@ ao_spi_send(void __xdata *block, uint16_t len) __reentrant ao_dma_trigger(ao_spi_dma_out_id); __critical while (!ao_spi_dma_in_done) ao_sleep(&ao_spi_dma_in_done); - ao_mutex_put(&ao_spi_mutex); } /* Receive bytes over SPI. @@ -76,7 +78,6 @@ ao_spi_send(void __xdata *block, uint16_t len) __reentrant void ao_spi_recv(void __xdata *block, uint16_t len) __reentrant { - ao_mutex_get(&ao_spi_mutex); ao_dma_set_transfer(ao_spi_dma_in_id, &U0DBUFXADDR, block, @@ -104,7 +105,6 @@ ao_spi_recv(void __xdata *block, uint16_t len) __reentrant ao_dma_trigger(ao_spi_dma_out_id); __critical while (!ao_spi_dma_in_done) ao_sleep(&ao_spi_dma_in_done); - ao_mutex_put(&ao_spi_mutex); } /* |