Hi Andrew, Going back to your original post, you say bit banging works with the main CPU. Is this a different device from the ATSAME54P20A? Or if they are the same device, was this bit banging done with the same SPI pins as the SPI peripheral, or different pins that you wired over? You show grounds being connected from board A to board B in the block diagram, but are you sure there is a good ground shared from CPU B to DAC B? Have you found this issue on multiple 'B' boards that you've manufactured? Best, Katlynne Jones
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