Arduino CAN Communication with MCP2515

This project demonstrates basic CAN (Controller Area Network) communication using an Arduino and the MCP2515 CAN controller. It includes setup, sending, and receiving CAN messages.

Components Used

• Arduino
• MCP2515 CAN Controller Module
• SPI Interface

Setup

1. Connect the MCP2515 to the Arduino:

   • SCLK to pin 12
   • MISO to pin 13
   • MOSI to pin 11
   • CS to pin 10
   • VCC to 5V
   • GND to GND

2. Install Libraries:

   • Install SPI and mcp2515 libraries in the Arduino IDE.

Code Overview

Libraries

#include <SPI.h>
#include <mcp2515.h>

Global Variables

struct can_frame canMsg;
MCP2515 mcp2515(10); // CS pin on GPIO 10

Setup Function

void setup() {
  Serial.begin(115200);
  SPI.begin(12, 13, 11, 10); // SCLK, MISO, MOSI, CS

  mcp2515.reset();
  if (mcp2515.setBitrate(CAN_500KBPS, MCP_8MHZ) == MCP2515::ERROR_OK) {
    Serial.println("MCP2515 Initialized Successfully");
  } else {
    Serial.println("Error Initializing MCP2515");
    while(1); // Stop execution if initialization fails
  }

  mcp2515.setLoopbackMode();

  canMsg.can_id = 0x100;
  canMsg.can_dlc = 8;
  for (int i = 0; i < 8; i++) {
    canMsg.data[i] = 0xFF;
  }
}

Loop Function

void loop() {
  if (mcp2515.sendMessage(&canMsg) == MCP2515::ERROR_OK) {
    Serial.println("Message Sent Successfully");
  } else {
    Serial.println("Error Sending Message");
  }

  struct can_frame rxMsg;
  if (mcp2515.readMessage(&rxMsg) == MCP2515::ERROR_OK) {
    Serial.print("Received Message with ID: ");
    Serial.println(rxMsg.can_id, HEX);
    Serial.print("Data: ");
    for (int i = 0; i < rxMsg.can_dlc; i++) {
      Serial.print(rxMsg.data[i], HEX);
      Serial.print(" ");
    }
    Serial.println();
  }

  delay(1000);
}

How It Works

1. Initialization: Sets up SPI communication and initializes the MCP2515 in loopback mode.
2. Sending CAN Message: Sends a CAN message with ID 0x100 and 8 data bytes set to 0xFF.
3. Receiving CAN Message: Checks for received CAN messages and prints them to the serial monitor.