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First question: Are you only send as many "valids" and bytes as the DMA expects, or are you overrunning or underfilling the buffer?
Second: Are you doing single transfers, or are you doing descriptor polling or park mode or anything else fancy?
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I read out the fill level to calculate the number of descriptors that can be
sent. I do not think overrun occurred.
No parks are used.
I just wanted to measure the transfer performance and to know the relation
between the size per a descriptor and the total performance.
So I sent simple but interruption enabling descriptors as many as the FIFO was
available and repeated that. If the FIFO gets full, the task sleeps until an
interruption occurrs.
Honored Contributor
