uint8_t mosi_dma_index = ao_spi_stm_info[AO_SPI_INDEX(spi_index)].mosi_dma_index;
uint8_t miso_dma_index = ao_spi_stm_info[AO_SPI_INDEX(spi_index)].miso_dma_index;
+ spi_dev_null = 0xff;
+
/* Set up transmit DMA to make the SPI hardware actually run */
ao_dma_set_transfer(mosi_dma_index,
&stm_spi->dr,