SPIslave not working on NUCLEO-F746ZG

I think the problem will be PD_14 and not the PA_7. Because the PD_14 is not a part of any SPI interface, correct one is PA_4 or PA_15 for the SPI1 CS.
I understand you need it because of the shield usage.
Maybe for verification you can take down the shield from board’s header and connect it via wires to different pins.

BR, Jan

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