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
