diff options
Diffstat (limited to 'src/stm/ao_spi_stm.c')
| -rw-r--r-- | src/stm/ao_spi_stm.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/src/stm/ao_spi_stm.c b/src/stm/ao_spi_stm.c index be24ebcf..8bb0d8e8 100644 --- a/src/stm/ao_spi_stm.c +++ b/src/stm/ao_spi_stm.c @@ -97,6 +97,62 @@ ao_spi_send(void *block, uint16_t len, uint8_t spi_index) } void +ao_spi_send_fixed(uint8_t value, uint16_t len, uint8_t spi_index) +{ + struct stm_spi *stm_spi = ao_spi_stm_info[spi_index].stm_spi; + uint8_t mosi_dma_index = ao_spi_stm_info[spi_index].mosi_dma_index; + uint8_t miso_dma_index = ao_spi_stm_info[spi_index].miso_dma_index; + + /* Set up the transmit DMA to deliver data */ + ao_dma_set_transfer(mosi_dma_index, + &stm_spi->dr, + &value, + len, + (0 << STM_DMA_CCR_MEM2MEM) | + (STM_DMA_CCR_PL_MEDIUM << STM_DMA_CCR_PL) | + (STM_DMA_CCR_MSIZE_8 << STM_DMA_CCR_MSIZE) | + (STM_DMA_CCR_PSIZE_8 << STM_DMA_CCR_PSIZE) | + (0 << STM_DMA_CCR_MINC) | + (0 << STM_DMA_CCR_PINC) | + (0 << STM_DMA_CCR_CIRC) | + (STM_DMA_CCR_DIR_MEM_TO_PER << STM_DMA_CCR_DIR)); + + /* Clear RXNE */ + (void) stm_spi->dr; + + /* Set up the receive DMA -- when this is done, we know the SPI unit + * is idle. Without this, we'd have to poll waiting for the BSY bit to + * be cleared + */ + ao_dma_set_transfer(miso_dma_index, + &stm_spi->dr, + &spi_dev_null, + len, + (0 << STM_DMA_CCR_MEM2MEM) | + (STM_DMA_CCR_PL_MEDIUM << STM_DMA_CCR_PL) | + (STM_DMA_CCR_MSIZE_8 << STM_DMA_CCR_MSIZE) | + (STM_DMA_CCR_PSIZE_8 << STM_DMA_CCR_PSIZE) | + (0 << STM_DMA_CCR_MINC) | + (0 << STM_DMA_CCR_PINC) | + (0 << STM_DMA_CCR_CIRC) | + (STM_DMA_CCR_DIR_PER_TO_MEM << STM_DMA_CCR_DIR)); + stm_spi->cr2 = ((0 << STM_SPI_CR2_TXEIE) | + (0 << STM_SPI_CR2_RXNEIE) | + (0 << STM_SPI_CR2_ERRIE) | + (0 << STM_SPI_CR2_SSOE) | + (1 << STM_SPI_CR2_TXDMAEN) | + (1 << STM_SPI_CR2_RXDMAEN)); + ao_dma_start(miso_dma_index); + ao_dma_start(mosi_dma_index); + ao_arch_critical( + while (!ao_dma_done[miso_dma_index]) + ao_sleep(&ao_dma_done[miso_dma_index]); + ); + ao_dma_done_transfer(mosi_dma_index); + ao_dma_done_transfer(miso_dma_index); +} + +void ao_spi_recv(void *block, uint16_t len, uint8_t spi_index) { struct stm_spi *stm_spi = ao_spi_stm_info[spi_index].stm_spi; @@ -154,6 +210,63 @@ ao_spi_recv(void *block, uint16_t len, uint8_t spi_index) } void +ao_spi_duplex(void *out, void *in, uint16_t len, uint8_t spi_index) +{ + struct stm_spi *stm_spi = ao_spi_stm_info[spi_index].stm_spi; + uint8_t mosi_dma_index = ao_spi_stm_info[spi_index].mosi_dma_index; + uint8_t miso_dma_index = ao_spi_stm_info[spi_index].miso_dma_index; + + /* Set up transmit DMA to send data */ + ao_dma_set_transfer(mosi_dma_index, + &stm_spi->dr, + out, + len, + (0 << STM_DMA_CCR_MEM2MEM) | + (STM_DMA_CCR_PL_MEDIUM << STM_DMA_CCR_PL) | + (STM_DMA_CCR_MSIZE_8 << STM_DMA_CCR_MSIZE) | + (STM_DMA_CCR_PSIZE_8 << STM_DMA_CCR_PSIZE) | + (1 << STM_DMA_CCR_MINC) | + (0 << STM_DMA_CCR_PINC) | + (0 << STM_DMA_CCR_CIRC) | + (STM_DMA_CCR_DIR_MEM_TO_PER << STM_DMA_CCR_DIR)); + + /* Clear RXNE */ + (void) stm_spi->dr; + + /* Set up the receive DMA to capture data */ + ao_dma_set_transfer(miso_dma_index, + &stm_spi->dr, + in, + len, + (0 << STM_DMA_CCR_MEM2MEM) | + (STM_DMA_CCR_PL_MEDIUM << STM_DMA_CCR_PL) | + (STM_DMA_CCR_MSIZE_8 << STM_DMA_CCR_MSIZE) | + (STM_DMA_CCR_PSIZE_8 << STM_DMA_CCR_PSIZE) | + (1 << STM_DMA_CCR_MINC) | + (0 << STM_DMA_CCR_PINC) | + (0 << STM_DMA_CCR_CIRC) | + (STM_DMA_CCR_DIR_PER_TO_MEM << STM_DMA_CCR_DIR)); + + stm_spi->cr2 = ((0 << STM_SPI_CR2_TXEIE) | + (0 << STM_SPI_CR2_RXNEIE) | + (0 << STM_SPI_CR2_ERRIE) | + (0 << STM_SPI_CR2_SSOE) | + (1 << STM_SPI_CR2_TXDMAEN) | + (1 << STM_SPI_CR2_RXDMAEN)); + ao_dma_start(miso_dma_index); + ao_dma_start(mosi_dma_index); + + /* Wait until the SPI unit is done */ + ao_arch_critical( + while (!ao_dma_done[miso_dma_index]) + ao_sleep(&ao_dma_done[miso_dma_index]); + ); + + ao_dma_done_transfer(mosi_dma_index); + ao_dma_done_transfer(miso_dma_index); +} + +void ao_spi_get(uint8_t spi_index) { struct stm_spi *stm_spi = ao_spi_stm_info[spi_index].stm_spi; |