arduino UNO R3/ESP8266连接MCP2515 CAN

arduino UNO R3/ESP8266连接MCP2515 CAN 

 

 CAN接收：

// demo: CAN-BUS Shield, receive data with interrupt mode, and set mask and filter
//
// when in interrupt mode, the data coming can't be too fast, must >20ms, or else you can use check mode
// loovee, 2014-7-8

#include 

#define CAN_2515
// #define CAN_2518FD

// Set SPI CS Pin according to your hardware

#if defined(SEEED_WIO_TERMINAL) && defined(CAN_2518FD)
// For Wio Terminal w/ MCP2518FD RPi Hat：
// Channel 0 SPI_CS Pin: BCM 8
// Channel 1 SPI_CS Pin: BCM 7
// Interupt Pin: BCM25
const int SPI_CS_PIN  = BCM8;
const int CAN_INT_PIN = BCM25;
#else

// For Arduino MCP2515 Hat:
// 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 = 9;
const int CAN_INT_PIN = 2;//INT表示中断的pin
#endif


#ifdef CAN_2518FD
#include "mcp2518fd_can.h"
mcp2518fd CAN(SPI_CS_PIN); // Set CS pin
#endif

#ifdef CAN_2515
#include "mcp2515_can.h"
mcp2515_can CAN(SPI_CS_PIN); // Set CS pin
#endif                              

unsigned char flagRecv = 0;
unsigned char len = 0;
unsigned char buf[8];
char str[20];

void setup() {
    SERIAL_PORT_MONITOR.begin(115200);
    while(!Serial){};
    attachInterrupt(digitalPinToInterrupt(CAN_INT_PIN), MCP2515_ISR, FALLING); // start interrupt(attachInterrupt()函数是用于为Arduino开发板设置和执行ISR（中断服务程序）用的

//ISR（中断服务程序）顾名思义就是中断Arduino当前正在处理的事情而优先去执行中断服务程序。当中断服务程序完成以后，再回来继续执行刚才执行的事情。中断服务程序对监测Arduino输入有很大的用处。)
    while (CAN_OK != CAN.begin(CAN_500KBPS)) {             // init can bus : baudrate = 500k
        SERIAL_PORT_MONITOR.println("CAN init fail, retry...");
        delay(100);
    }
    SERIAL_PORT_MONITOR.println("CAN init ok!");

    /*
        set mask, set both the mask to 0x3ff
    */
    CAN.init_Mask(0, 0, 0x3ff);                         // there are 2 mask in mcp2515, you need to set both of them
    CAN.init_Mask(1, 0, 0x3ff);


    /*
        set filter, we can receive id from 0x04 ~ 0x09
    */
    CAN.init_Filt(0, 0, 0x04);                          // there are 6 filter in mcp2515
    CAN.init_Filt(1, 0, 0x05);                          // there are 6 filter in mcp2515

    CAN.init_Filt(2, 0, 0x06);                          // there are 6 filter in mcp2515
    CAN.init_Filt(3, 0, 0x07);                          // there are 6 filter in mcp2515
    CAN.init_Filt(4, 0, 0x08);                          // there are 6 filter in mcp2515
    CAN.init_Filt(5, 0, 0x09);                          // there are 6 filter in mcp2515
}

void MCP2515_ISR() {
    flagRecv = 1;
    SERIAL_PORT_MONITOR.println("flagRecv is trigger!!!");
}

void loop() {
    if (flagRecv) {                // check if get data

        flagRecv = 0;                // clear flag
        CAN.readMsgBuf(&len, buf);    // read data,  len: data length, buf: data buf

        SERIAL_PORT_MONITOR.println("\r\n------------------------------------------------------------------");
        SERIAL_PORT_MONITOR.print("Get Data From id: ");
        SERIAL_PORT_MONITOR.println(CAN.getCanId());
        for (int i = 0; i < len; i++) { // print the data
            SERIAL_PORT_MONITOR.print("0x");
            SERIAL_PORT_MONITOR.print(buf[i], HEX);
            SERIAL_PORT_MONITOR.print("\t");
        }
        SERIAL_PORT_MONITOR.println();
    }
}

/*********************************************************************************************************
    END FILE
*********************************************************************************************************/

CAN发送：

// demo: set_mask_filter_send
// this demo will show you how to use mask and filter
#include 

#define CAN_2515
// #define CAN_2518FD

// Set SPI CS Pin according to your hardware

#if defined(SEEED_WIO_TERMINAL) && defined(CAN_2518FD)
// For Wio Terminal w/ MCP2518FD RPi Hat：
// Channel 0 SPI_CS Pin: BCM 8
// Channel 1 SPI_CS Pin: BCM 7
// Interupt Pin: BCM25
const int SPI_CS_PIN  = BCM8;
const int CAN_INT_PIN = BCM25;
#else

// For Arduino MCP2515 Hat:
// 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 = 9;//arduino UNO R3
//const int CAN_INT_PIN = 2;//arduino UNO R3
//
const int SPI_CS_PIN = D8;//ESP8266
const int CAN_INT_PIN = D2;//ESP8266
#endif


#ifdef CAN_2518FD
#include "mcp2518fd_can.h"
mcp2518fd CAN(SPI_CS_PIN); // Set CS pin
#endif

#ifdef CAN_2515
#include "mcp2515_can.h"
mcp2515_can CAN(SPI_CS_PIN); // Set CS pin
#endif  


                         

void setup() {
  
    SERIAL_PORT_MONITOR.begin(115200);
    while(!Serial){};
    
    while (CAN_OK != CAN.begin(CAN_500KBPS)) {             // init can bus : baudrate = 500k
        SERIAL_PORT_MONITOR.println("CAN init fail, retry...");
        delay(100);
    }
    SERIAL_PORT_MONITOR.println("CAN init ok!");
}

unsigned char stmp[8] = {0, 1, 2, 3, 4, 5, 6, 7};

void loop() {
    
    for (int id = 0; id < 10; id++) 
    {
       // memset(stmp, id, sizeof(stmp));                 // set id to send data buff
        CAN.sendMsgBuf(id, 0, sizeof(stmp), stmp);
        delay(1000);
    }
    delay(1000);
  
}

/*********************************************************************************************************
    END FILE
*********************************************************************************************************/

头文件在群文件289186279