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am3359 mcasp edma problem

Other Parts Discussed in Thread: AM3359

hello,

i use am3359 and sys/bios.

i use mcasp to transmiter non audio data , i use edma to sevice the mcasp.

i configure mcasp in burst mode with fifo enable.

the edma was set up to send 256bytes ,after that the param was link to a dummy param.

my problem is that i can only send the first 256bytes, next time when i want to send another 256 bytes,it fails.

i sees that the the next time the afifo in mcasp did not send dma request to edma, so it fails.

i also make a test , when i configure the edma to link to another param after the first 256 bytes, keep the mcasp afifo not empty, the mcasp works fine.

should i always makes the mcasp afifo not empty??