bitfield dma transfer

[IvanoBono]

Hi,

I would need to make a copy of a bitfield at the event of an interrupt. currently i do this using an interrupt of a cpu but i would like to exploit the dma to make this copy freeing the load from the cpu. is it possible to configure the dma to copy a single bit instead of an entire byte?

[LaneYE · Accepted solution]

I am afraid it's impossible to configure the DMA to copy a single bit. Because the atom of DMA read/write is one DMA Move, and the move data length must be above 1 byte(8-bit/16-bit/32-bit/64-bit/128-bit/256-bit). Pls see CHCFGRc.CHDW register for more information.