Using a DMA channel to move data from DMAMEM to EXTMEM

[yeahtuna]

I honestly know almost nothing about DMA channels, but I'm curious about moving some data from a buffer in DMAMEM to another one in EXTMEM (PSRAM). Is that something I can do? Is the method basically the same as described in the following thread? Thanks for any insights you can share.

https://forum.pjrc.com/threads/69845-T4-memory-to-memory-using-dma?highlight=dma+memcpy

 

[jmarsh]

It's the same as usual (DMA memory access is basically the same as the CPU since there's no MMU) except with those memory regions you'd need cache management - flush any source memory from the CPU's cache before the transfer happens and delete any cached data from the destination memory after the transfer.

 

[yeahtuna]

I haven't had time to implement and benchmark its performance yet, but I just wanted to say thanks.