Hi I have a small problem with SAI and DMA.

spa23 · ‎2021-01-15

I have a small problem if I use SAI DMA in circular mode, the first time it fills up the buffer, it works fine, but after it looks like it is the right data levels, but just that some are omitted.

the top chart is DMA filling up the buffer, (first run)

the other is if i let it run for a while and then read out data.

Anyone have an idea for what might be wrong?

spa23 · ‎2021-01-19

just updated the question. 🙂

RPuch.2 · ‎2023-02-25

Hi. Did you manage to bypass the problem? I am also struggling with DMA for SAI. Maybe you can suggest something?

https://community.st.com/s/question/0D53W000029SXMnSAO/data-acquisition-from-pdm-microphones-via-sai-using-dma-problem-with-writing-to-pdmbuffer