In segmented transfer, for each actual SPI transaction, you need two buffers (and as such 2 or more descriptors): the second one is your actual data, like you have, but the first one needs to be the special CONF buffer type.


I see. I did read that in the TRM. I thought I had set it up, but to ...

Hello,

I've something of an X/Y problem, but I'll explain the Y first (as it's the title of this post and a matter of curiosity at this point, at the very least), and follow up with the X.

The Title (Y) Problem

I'm trying to set up the SPI peripheral with the configurable segmented transfer (in ...