Is it possible to clear a memory area in RAM with the DMA?

[sima2]

Posted on April 13, 2011 at 13:53

Is it possible to clear a memory area in RAM with the DMA?

[Tesla DeLorean]

Posted on May 17, 2011 at 14:31

You could try memory-to-memory, from a region that contains zeros, the regions could overlap.

[sima2]

Posted on May 17, 2011 at 14:31

So if I set buffer[0] = 0 and then initiate a DMA block copy from &buffer[0] to &buffer[1] it should work?

[Tesla DeLorean]

Posted on May 17, 2011 at 14:31

Yeah, but you'd probably want to do it in 32-bit or 16-bit units, or whatever alignment works for the DMA.

You could use a different fill pattern too. I there are reason to be using DMA, because it's going to steal a lot of bus cycles?