Using the ADuCM320.
We've setup the DMA to handle UART RX. Everything is working as expected.
Is there a way to tell if the DMA has transferred some bytes from the UART, but not enough to trigger the DMA finished interrupt? (The DMA is set to trigger on 8-bytes, but the UART has only Rx'd 5-bytes).
The ADuCM320 user guide states the following...
"During the DMA transfer process, but before arbitration, CHNL_CFG is written back to system memory with the N_MINUS_1 field changed to reflect the number of transfers yet to be completed."
However, when we pull the DMA descriptor field, the N_MINUS_1 count does not appear to be updating.
It looks like the DMA is updating the channel description block as specified in the UG -just not the count field I'm interested in.
Am I interpreting this wrong? Or is there another way to tell the number of bytes the DMA has transferred?
(I'm just looking for a simple way to implement an RX timeout on the UART channel.)