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CAN Bus Library

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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
    [email protected]
    
    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,

Contact us

If you have any question, please feel free to contact [email protected]