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pierremolinaro / acan2515

MCP2515 CAN Controller Driver for Arduino
MIT License
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Default SPI on Pi Pico (RP2040) #33

Closed david284 closed 2 years ago

david284 commented 2 years ago

Wanting to use your library on a Pi Pico, sitting on a prebuilt circuit board that has an SPI device (MCP2515) on the 'default' SPI pins of the Pi Pico module (GPIO 16 - 19)

Unfortunately, the 'standard' Arduino SPI library uses GPIO2 - GPIO5 - I've proved this by running an SPI 'loopback' test And I see your library uses this library The default doesn't appear to allow you to redefine the pins used

Any idea how I can resolve this? (I'd rather not cut pcb tracks to re-work the physical pins)

I did get the SPI test working on the 'default' pins using instead of , as allows you to redefine the pins used, but the syntax of the SPI functions seems to be slightly different, and of course your library uses , so I don't see how that helps

If it's any use, here's the build info for the working test I mentioned using

` PLATFORMPLATFORM: Raspberry Pi RP2040 (1.5.0) > Raspberry Pi Pico HARDWARE: RP2040 133MHz, 264KB RAM, 2MB Flash DEBUG: Current (cmsis-dap) External (cmsis-dap, jlink, raspberrypi-swd)
PACKAGES:

david284 commented 2 years ago

Ok It seems the issue of not using the 'default' SPI pins is confined to earlier versions of mbed-core PlatformIO seems to be using version 2.6.1, but the Arduino IDE uses V2.8.0, which has the correct default pins

So, consider this a closed issue, as I can use the Arduino IDE, or I suspect I can manually edit the pins_arduino.h used in platformIO as a temporary measure until the version gets updated

pierremolinaro commented 2 years ago

Hello,

I have installed Arduino Mbed OS RP 2040 2.8.0, it is very instable on Mac (impossible to change monitor serial bit rate — crash). and I did not succeed to change default SPI pins.

Earle Philhower's board manager (https://github.com/earlephilhower/arduino-pico https://github.com/earlephilhower/arduino-pico) runs much better.

Best Regards,

Pierre

Le 15 mars 2022 à 17:55, david284 @.***> a écrit :

Ok It seems the issue of not using the 'default' SPI pins is confined to earlier versions of mbed-core PlatformIO seems to be using version 2.6.1, but the Arduino IDE uses V2.8.0, which has the correct default pins

So, consider this a closed issue, as I can use the Arduino IDE, or I suspect I can manually edit the pins_arduino.h used in platformIO as a temporary measure until the version gets updated

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david284 commented 2 years ago

Thanks for the comment about Earle Philhower's board manager - if I run into trouble with mbed I may try it