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DMA:Basic chain mode

Question asked by 同想 蔡 on Mar 24, 2016
Latest reply on Mar 31, 2016 by alexander.yakovlev

On T4240qds board,duo to project,I want to use Basic chain mode to DMA data.so I use the Official software interface "fsl_dma_chain_link_build" and "fsl_dma_direct_start"  to program. I can dma data successfully,but the Speed is one probelem .speed is very low .only 7MB/S.  In direct mode ,I use the Offical software interface to program ,the speed is about 1.4GB/s.

Therefore,I would like to know what causes this problem that the DMA Speed is very low in Basic chain mode ?

Has anyone ever had a similar problem?

Whether someone can provide a document on the use of DMA?

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