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- /*
- To use a CAN Bus module based on the MCP2515 CAN controller and TJA1050 transceiver with an Arduino, you can use the "MCP_CAN" library by Cory J. Fowler. This library makes it easy to interact with the CAN Bus module using SPI communication.
- Here's an example of Arduino code to send and receive messages using the MCP2515 CAN Bus module:
- Requirements:
- Arduino board (e.g., Uno, Mega, Nano)
- CAN Bus module (MCP2515 + TJA1050)
- Jumper wires
- MCP_CAN library (install from Arduino IDE Library Manager)
- In this example, the MCP2515 CAN Bus module is connected to the Arduino using the SPI interface with a chip select pin (SPI_CS_PIN) defined as 10. The module is initialized at 500kbps. The code sends a 6-byte message with an ID of 0x100 and a predefined data payload. It also listens for incoming CAN messages and prints the received ID and data to the Serial Monitor.
- Before uploading the code, make sure you have the MCP_CAN library installed. You can install it through the Arduino IDE Library Manager. Search for "MCP_CAN" by Cory J. Fowler and install the library.
- */
- #include <SPI.h>
- #include <mcp_can.h>
- // Pins for the MCP2515 CAN module
- const int SPI_CS_PIN = 10;
- // Create MCP_CAN object
- MCP_CAN CAN(SPI_CS_PIN);
- void setup() {
- Serial.begin(115200);
- // Initialize MCP2515 CAN module at 500kbps
- while (CAN_OK != CAN.begin(CAN_500KBPS)) {
- Serial.println("CAN BUS Module Failed to Initialize! Retrying...");
- delay(1000);
- }
- Serial.println("CAN BUS Module Initialized!");
- // Set up receiving mask and filter
- CAN.init_Mask(0, 0x7FF);
- CAN.init_Filt(0, 0x7FF);
- }
- void loop() {
- // Send a CAN message
- unsigned long id = 0x100;
- byte data[] = {0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF};
- byte len = 6;
- CAN.sendMsgBuf(id, 0, len, data);
- // Receive a CAN message
- long unsigned int rxId;
- byte rxBuf[8];
- byte rxLen = 0;
- if (CAN_MSGAVAIL == CAN.checkReceive()) {
- CAN.readMsgBuf(&rxId, &rxLen, rxBuf);
- Serial.print("Received ID: 0x");
- Serial.print(rxId, HEX);
- Serial.print(" Data: ");
- for (int i = 0; i < rxLen; i++) {
- Serial.print(rxBuf[i], HEX);
- Serial.print(" ");
- }
- Serial.println();
- }
- delay(1000);
- }
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