SPI_CMD_RX_DMA
reg_val |= SPI_CMD_RX_DMA;
reg_val &= ~SPI_CMD_RX_DMA;
reg_val &= ~(SPI_CMD_TX_DMA | SPI_CMD_RX_DMA);
cmd |= SPI_CMD_RX_DMA;
cmd &= ~SPI_CMD_RX_DMA;