I have been trying to use DAC - DMA with PIT trigger mode and I've found an issue with it.
In function :
edma_status_t EDMA_DRV_ClaimChannel(uint8_t channel, dma_request_source_t source, edma_chn_state_t *chn)
it is not possible to set the periodic trigger mode using PIT.
That is, DMAMUX_CHCFGn[TRIG] is never set, whatever the source selected for DMA (kDmaRequestMux0AlwaysOn63)
I fixed it with the following workaround, which is very bad but give the PIT trigger functionality available :
if (source> kDmaRequestMux0AlwaysOn60)
DMAMUX_HAL_SetPeriodTriggerCmd(dmamuxRegBase, dmamuxChannel, true);
Hope this helps,