SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
Each McSPI channel, if enabled, can issue DMA requests. There are two DMA request lines per McSPI channel (one for read and one for write).
The DMA read request line is asserted when the McSPI channel is enabled and new data is available in the receive register of the McSPI channel. A DMA read request can be individually masked with the SPI1.MCSPI_CHxCONF[15] DMAR bit. The DMA read request line is deasserted when reading of the MCSPI_RXx register of the McSPI channel completes.
The DMA write request line is asserted when the McSPI channel is enabled and the MCSPI_TXx register of the McSPI channel is empty. A DMA write request can be individually masked with the SPI1.MCSPI_CHxCONF[14] DMAW bit. The DMA write request line is deasserted when loading of the MCSPI_TXx register of the channel completes.