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?