STM32H755 FIFO DMA

[chrkaras]

Hello everyone!

 

I got the following problem; I need to read from two 32bit addresses and write the data to three. Specifically, i am interested in the case shown in the left side of the image, where the N[0:15] increment by half word and write to the M[0:15] but it will increment by a full word. Don't worry about the reserved bytes in the HTIMx_CC1R, I checked the manual and are always at zero. 

I saw that the H7 can read/write with weird patters using the fifo functionality. The thing is I can't understand at all how to set it up. Is there any other better way?

 

Thanks in advance!

 

[FBL]

Hi ​@chrkaras 

It’s not recommended to rely on DMA FIFO for this custom repacking. You can use software packing, or you can evaluate MDMA for non contiguous blocks.