MCP2515 Driver

This repository contains a two-part driver for the MCP2515 CAN controller: a interface driver and base implementations for Linux and Cosa. Apps that use this driver need to install mcp2515-driver and one of mcp2515-linux or mcp2515-cosa.

The platform-specific packages implement an interface for the base SPI functions needed by the front-end driver.

Example Usage

For use on linux, install mcp2515-driver and mcp2515-linux.

#include <sys/mcp2515.h>
#include <MCP2515.h>

using namespace wlp;

int main(void) {
    linux::MCP2515 base("/dev/spidev0.0", 10000000);
    MCP2515 bus(&base); // pass base to front-end
    base.begin();       // initialize SPI
    bus.begin(CAN_500KBPS, MCP_8MHz);
    // ...
}

For use with Cosa, install mcp2515-cosa instead.

#include <Cosa/MCP2515.h>
#include <MCP2515.h>

using namespace wlp;

static cosa::MCP2515 base;
static MCP2515 bus(&base);

void setup() {
    bus.begin(CAN_500KBPS, MCP_8MHz);
}

void loop() {
    // ...
}

Sample Applications

This repo contains app-cosa and app-linux which each have a sender and receiver example.

Caveats

If you are using an 8 MHz CAN chip you must ensure you use the 8 MHz configuration or else the chip will not function correctly. Keep in mind that the available bitrates for 8 MHz is lower than for 16 MHz.

Additionally, using the 8 MHz on a 16 MHz chip is "possible" but it will cause 8 MHz chips on the network to be flooded out.