SPRZ569 November 2024 F29H850TU , F29H859TU-Q1
During DCAN FIFO Mode, Received Messages May be Placed Out of Order in the FIFO Buffer
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In DCAN FIFO mode, received messages with the same arbitration and mask IDs are supposed to be placed in the FIFO in the order in which they are received. The CPU then retrieves the received messages from the FIFO via the IF1/IF2 interface registers. Some messages may be placed in the FIFO out of the order in which they were received. If the order of the messages is critical to the application for processing, then this behavior will prevent the proper use of the DCAN FIFO mode.
Use the DMA to read out the FIFO via the IF3 register. Each time a message is received into the FIFO, the data is also copied to the IF3 register, and a DMA request Is generated to the DMA module to read out the data.