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Altera_Forum
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10 years ago

Altera SGDMA & TSE

Hi all, I am working on TSE and is using sgdma for avalon_stream_to_mem descriptor, now in my code I have four descriptors,I am receiving network packets in my local buffer from sgdma in every sgd...
Altera_Forum's avatar
Altera_Forum
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10 years ago

Hi ted,

As you are saying that there is already support for multiple descriptors in interniche drivers, then can you tell me how to use it for multiple descriptors and/or chain? I tried with calling altera_sgdma_stream_to_mem_descriptor() but couldn't get it done. If we increase the value stored in ALTERA_TSE_SGDMA_RX_DESC_CHAIN_SIZE to 2 or more than it will be a chain with two descriptors. Suppose if I want to use sgdma at its maximum capacity than how should I go with multiple chain or descriptor?

Also one question is that there are so many references like ucos ii interniche stack and lwip stack and standalone sgdma software. But none of them uses multiple chain logic. Is there any specific reason for this or people generally do not prefer to use multiple chain?