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SGDMA Reception in Polling mode

Altera_Forum
Honored Contributor II
‎10-19-2015 11:14 AM
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Hi, 

I want to poll SGDMA for incoming packets from the network in TSE, here what I am doing is constructing the descriptor and submitting it with do_sync_transfer and it polls BUSY bit and returns when completed, after that I am reading data and store to buffer. But my code stuck in polling busy bit in the do_sync_transfer. 

Any body know how to solve this?
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Altera_Forum
Honored Contributor II
‎10-20-2015 09:30 AM
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Are you sure the SGDMA actually does the transfer? Try and monitor is with SignalTap. do_sync_transfer should return as soon as the DMA is finished. 

Do you have a descriptor chain where the first descriptor has OWNED_BY_HW set to 1 and the second has is to 0?
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