adamczykpiotr / pico-mcp2515

Raspberry Pi Pico MCP2515 CAN-Bus Interface Library

Raspberry Pi Pico MCP2515 CAN interface library

This Raspberry Pi Pico library is a ported & optimized version of the magnificent library arduino-mcp2515 by autowp.

Optimization

This library was optimized to use SPI transfer of multiple bytes in a single function call. This is contrary to the original code where for loop was heavily used. Theese optimizations might seem insignificant as they shave only few microseconds each time but they surely add up. If the only goal of the microcontroller is to poll CAN-Bus frames, the speedup can reach roughly from 20 to 40% depending on frame byte count!

Benchmark used with frame polling:

Frame bytes	Before [µs]	After [µs]	Speedup [%]
0	35	29	22.8
1	37	29	21.6
2	39	30	30.0
3	41	31	32.3
4	43	32	34.4
5	45	33	36.4
6	47	34	38.2
7	49	35	40.0
8	51	36	41.7
Average	43	31.9	33.0

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This software is written by loovee ([email protected]) for seeed studio, updated by Dmitry (https://github.com/autowp) and then ported by Piotr Adamczyk https://github.com/adamczykpiotr and is licensed under The MIT License. Check LICENSE.md for more information.

Contributing to this software is warmly welcomed. You can do this basically by forking, committing modifications and then pulling requests (follow the links above for operating guide). Adding change log and your contact into file header is encouraged. Thanks for your contribution.

Seeed Studio is an open hardware facilitation company based in Shenzhen, China. Benefiting from local manufacture power and convenient global logistic system, we integrate resources to serve new era of innovation. Seeed also works with global distributors and partners to push open hardware movement

pico-mcp2515's Issues

pico-mcp2515 for micropython

Hi thanks for the great library.

Could you provide the python library?

Adding information what IO-pins to use

Hi Adam,

I have looked for but did not find any information about which IO-pins are used for the SPI-interface.
I am even more confused as the Pin-outs that can be found for the RP2040 pico show four sets of IO-pins that are named SPI-0.

Huh ? Now which IO-pins do I use? I guess the pico can not autodetect them.

Thank you.

Just wanna to say - "Thank you", everything works.

How to use this library with pico?

Hi, I have tried downloading the library and adding it as a zip library, but it is returning me this error.

Could you advice on how I could go about using your library for the raspberry pi pico? Thanks in advance.