SPRUIU1C July 2020 – February 2024 DRA821U , DRA821U-Q1
The MCAN module is found to require a few minor differences than standard X-Y mode. First, buffer ownership on transmit is different in that the PDMA will start out owning the TX buffer space (instead of waiting for an initial DMA event from the MCAN). There is also a requirement to perform a write of a fixed value to a fixed address after each DMA event is serviced to pass ownership of a buffer back to the MCAN. Finally, there is an MCAN packet fragmentation requirement to place an 8-byte header on each 64-byte chunk that is transmitted and to remove the header from each 64-byte chunk (other than the first block) that is received.