SWCU194 March 2023 CC1314R10 , CC1354P10 , CC1354R10 , CC2674P10 , CC2674R10
Channels may be set up to perform software transfers through the UDMA:SOFTREQ register. If the channel used for software is also tied to a specific peripheral, the dma_done/interrupt signal is provided directly to the Arm®Cortex®-M33 CPU instead of sending it to the peripheral. The interrupt used is a combined interrupt, number 46 – software µDMA interrupt, for all software transfers.
If software uses a μDMA channel of the peripheral to initiate a request, then the completion interrupt occurs on the interrupt vector for the peripheral instead of occurring on the software interrupt vector.
DMA software requests are specified on channels 0 and 18. For these channels, dma_done is available as events DMA_CH0_DONE and DMA_CH18_DONE in the EV field of the EVENT:UDMACH14BSEL or EVENT:CPUIRQSEL30 registers.