CAN Bus Library

Arduino library for MCP2515, it's available for most of theArduino boards, we test it with Arduino UNO, Leonardo, Mega as well as Zero.

With this library, you can,

1. Send a CAN2.0 frame
2. Receive a CAN2.0 frame
3. Get data from OBD-II
4. Set the masks and filters, there're 32 masks and filters.

Installation

You can install it similiar to any other Arduino libraries, using the Library Manager or from a Zip file in the Arduino IDE.

• Install using the Library Manager

1. In the Arduino IDE, navigate to Sketch > Include Library > Manage Libraries...
2. Search for "mcp_canbus" to find this library
3. Click "INSTALL"

• Install from a Zip file

1. Download this library
2. Extract the zip file
3. In the Arduino IDE, navigate to Sketch > Include Library > Add .ZIP Library

You can also read how to install mcp_canbus library for a reference.

Respository Contents

• /examples - Example sketches for the library (.ino). Run these from the Arduino IDE.
• /src - Source files for the library (.cpp, .h).
• keywords.txt - Keywords from this library that will be highlighted in the Arduino IDE.
• library.properties - General library properties for the Arduino package manager.

How to use

Header

#include <mcp_canbus.h>

Functions

• begin()
• init_Mask()
• init_filt()
• checkReceive()
• readMsgBufID()
• readMsgBuf()
• getCanId()
• sendMsgBuf()
• isRemoteRequest()
• isExtendedFrame()

Examples

here are many examples implemented in this library. One of the examples is below. You can find other examples here

/*  send a frame from can bus
    support@longan-labs.cc
    
    CAN Baudrate,
    
    #define CAN_5KBPS           1
    #define CAN_10KBPS          2
    #define CAN_20KBPS          3
    #define CAN_25KBPS          4 
    #define CAN_31K25BPS        5
    #define CAN_33KBPS          6
    #define CAN_40KBPS          7
    #define CAN_50KBPS          8
    #define CAN_80KBPS          9
    #define CAN_83K3BPS         10
    #define CAN_95KBPS          11
    #define CAN_100KBPS         12
    #define CAN_125KBPS         13
    #define CAN_200KBPS         14
    #define CAN_250KBPS         15
    #define CAN_500KBPS         16
    #define CAN_666KBPS         17
    #define CAN_1000KBPS        18
    
    CANBed V1: https://www.longan-labs.cc/1030008.html
    CANBed M0: https://www.longan-labs.cc/1030014.html
    CAN Bus Shield: https://www.longan-labs.cc/1030016.html
    OBD-II CAN Bus GPS Dev Kit: https://www.longan-labs.cc/1030003.html
*/
   
#include <mcp_canbus.h>
#include <SPI.h>

const int SPI_CS_PIN = 17;              // CANBed V1
// const int SPI_CS_PIN = 3;            // CANBed M0
// const int SPI_CS_PIN = 9;            // CAN Bus Shield

MCP_CAN CAN(SPI_CS_PIN);                                    // Set CS pin

void setup()
{
    Serial.begin(115200);
    while(!Serial);
    
    // below code need for OBD-II GPS Dev Kit
    // pinMode(A3, OUTPUT);
    // digitalWrite(A3, HIGH);
    
    while (CAN_OK != CAN.begin(CAN_500KBPS))    // init can bus : baudrate = 500k
    {
        Serial.println("CAN BUS FAIL!");
        delay(100);
    }
    Serial.println("CAN BUS OK!");
}

unsigned char stmp[8] = {0, 1, 2, 3, 4, 5, 6, 7};
void loop()
{
    CAN.sendMsgBuf(0x00, 0, 8, stmp);
    delay(100);                       // send data per 100ms
}

// END FILE

Get a Dev Board

If you need a Dev board, plese try,

• CAN Bus Shield for Arduino
• CANBed V1
• CANBed M0
• OBD-II CAN Bus GPS Dev Kit

Contact us

If you have any question, please feel free to contact support@longan-labs.cc