On Sat, Oct 31, 2020 at 4:35 PM Patrick Menschel <menschel.p@xxxxxxxxx> wrote: > > > 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 Thank you! That appears to have solved the problem: #dtoverlay=2xMCP2517FD pi@raspberrypi:~$ dmesg | grep -Ei can\|spi [ 5.916785] DEBUG spi.c spi_setup(): ENTER [ 5.917056] DEBUG spi.c spi_setup(): ENTER [ 5.960326] DEBUG spi.c spi_setup(): ENTER [ 6.897919] CAN device driver interface [ 6.904530] mcp251xfd spi0.0: DEBUG mcp251xfd mcp251xfd_probe(): devm_clk_get() [ 6.904574] mcp251xfd spi0.0: DEBUG mcp251xfd mcp251xfd_probe(): feq=40000000 [ 6.904641] DEBUG spi.c spi_setup(): ENTER [ 6.904658] spi_master spi0: will run message pump with realtime priority [ 6.912009] mcp251xfd spi0.0 can0: MCP2517FD rev0.0 (-RX_INT +MAB_NO_WARN +CRC_REG +CRC_RX +CRC_TX +ECC -HD c:40.00MHz m:20.00MHz r:17.00MHz e:0.00MHz) successfully initialized. [ 6.912613] mcp251xfd spi1.0: DEBUG mcp251xfd mcp251xfd_probe(): devm_clk_get() [ 6.912646] mcp251xfd spi1.0: DEBUG mcp251xfd mcp251xfd_probe(): feq=40000000 [ 6.912701] DEBUG spi.c spi_setup(): ENTER [ 6.912719] spi_master spi1: will run message pump with realtime priority [ 6.920067] mcp251xfd spi1.0 can1: MCP2517FD rev0.0 (-RX_INT +MAB_NO_WARN +CRC_REG +CRC_RX +CRC_TX +ECC -HD c:40.00MHz m:20.00MHz r:17.00MHz e:0.00MHz) successfully initialized. Thanks, Drew
