> I believe Waveshare did choose other interrupt pins. > Marc used 24 25 which I also chose for a pHat I'm currently making > schematics for. > > Try these lines in /boot/config.txt > > dtoverlay=mcp251xfd-spi0-0,interrupt=25 > dtoverlay=mcp251xfd-spi1-0,interrupt=16 > > The waveshare overlay is strange in one point. It uses Pin 26 (instead > of 18) for Chip selection but that is no chip select pin. This can work > if the pin is output and luckily pulls the CE line in the right direction. > > https://gist.github.com/pdp7/784d0ba8b9648d20ab055747ec945225#file-2xmcp2517fd-overlay-dts-L40 > > https://pinout.xyz/pinout/pin37_gpio26# > > Maybe this has something to do with Nvidia Jetson Platform. > > -- > Patrick > Apparently Pin 26 is CE1 for SPI5, only available on Pi 4. https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README#L2674 -- Patrick
