Wiring the MCP2515 Stand-alone CAN Controller with SPI

This is an illustration how CAN (Controller Area Network) protocol interface works with Microcontroller. CAN protocol is methodology of communication between electronics devices, commonly found in Automotive, these device is the responsible for the car engine management system, Gear Control, Active Suspension, ABS, Lightning and Control, Air Condition, Air Bags, Security System, Central Locking, ETC. As you can see below diagram its uses 2 microcontroller and 2 CAN module here you will see how microcontroller interface with CAN (MCP2515) and drive as 2 wire RX/TX base data communication.

The MCP2515 is a stand-alone CAN Controller Area Network that implements the CAN specification v2.0B. These device is capable of transmitting and receiving both standard and extended data/remote frames and it has standard SPI (Serial Peripheral Interface). MCP2515 has 2 acceptance mask and 6 acceptance filters that are used to filter out unwanted messages, reducing the host MCU overhead.

Required Component

2x Arduino Micro-controller
2x MCP2515 Module
Jumper Wires / DuPont Wires
Solder-less Breadboard

Wiring Diagram

Importing the required code libraries

Test Code / Test Sketch Code

// demo: CAN-BUS Shield, receive data with check mode
// send data coming to fast, such as less than 10ms, you can use this way
#include <SPI.h>
#include "mcp_can.h"
// the cs pin of the version after v1.1 is default to D9
// v0.9b and v1.0 is default D10
const int SPI_CS_PIN = 10; // Default is 9 
MCP_CAN CAN(SPI_CS_PIN);                                    // Set CS pin
void setup()
{
    Serial.begin(115200); // Set baud rate 115200

START_INIT:

    if(CAN_OK == CAN.begin(CAN_500KBPS)) // init can bus : baudrate = 500k
    {
        Serial.println("14CORE | CAN BUS TEST CODE");
        Serial.println("CAN BUS MODULE IS RUNNING");
        Serial.println("..........................");
    }
    else
    {
        Serial.println("CAN BUS MODULE NOT RESPONDING");
        Serial.println("INITIALIZING CAN MODULE PLEASE WAIT...");
        delay(100);
        goto START_INIT;
    }
}


void loop()
{
    unsigned char len = 0;
    unsigned char buf[8];

    if(CAN_MSGAVAIL == CAN.checkReceive()) // check if data coming
    {
        CAN.readMsgBuf(&len, buf);    // read data,  len: data length, buf: data buf

        unsigned char canId = CAN.getCanId();
        
        Serial.println("-----------------------------");
        Serial.println("get data from ID: ");
        Serial.println(canId);

        for(int i = 0; i<len; i++)    // print the data
        {
            Serial.print(buf[i]);
            Serial.print("\t");
        }
        Serial.println();
    }
}

// demo: CAN-BUS Shield, receive data with check mode

// send data coming to fast, such as less than 10ms, you can use this way

#include <SPI.h>

#include "mcp_can.h"

// the cs pin of the version after v1.1 is default to D9

// v0.9b and v1.0 is default D10

const int SPI_CS_PIN = 10; // Default is 9

MCP_CAN CAN(SPI_CS_PIN); // Set CS pin

void setup()

{

Serial.begin(115200); // Set baud rate 115200

START_INIT:

if(CAN_OK == CAN.begin(CAN_500KBPS)) // init can bus : baudrate = 500k

{

Serial.println("14CORE | CAN BUS TEST CODE");

Serial.println("CAN BUS MODULE IS RUNNING");

Serial.println("..........................");

}

else

{

Serial.println("CAN BUS MODULE NOT RESPONDING");

Serial.println("INITIALIZING CAN MODULE PLEASE WAIT...");

delay(100);

goto START_INIT;

}

void loop()

{

unsigned char len = 0;

unsigned char buf[8];

if(CAN_MSGAVAIL == CAN.checkReceive()) // check if data coming

{

CAN.readMsgBuf(&len, buf); // read data, len: data length, buf: data buf

unsigned char canId = CAN.getCanId();

Serial.println("-----------------------------");

Serial.println("get data from ID: ");

Serial.println(canId);

for(int i = 0; i<len; i++) // print the data

{

Serial.print(buf[i]);

Serial.print("\t");

}

Serial.println();

}

Downloads

Download the Code Libraries Here | Zip
Download the MCP2515 Datasheet Here | PDF

Wiring the MCP2515 Stand-alone CAN Controller with SPI

Tagged on: #fourteencore #fourtencore 14CORE Arduino CAN Controller SPI

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