CAN总线实验.docxVIP

实验三 CAN总线实验一．实验目的学习基于SJA1000的CAN总线标准帧通信，实现2个CAN通信节点之间的数据通信。二、验设备及器件计算机（带串口）一台单片机实验仪一台三、实验内容编写一段程序，实现CAN节点的初始化，能够2节点之间的数据收发，用本节点的I/O控制另一个节点的LED灯。四、实验步骤图3、SJA1000及82C250接口电路1、将2块CAN实验板的CAN总线的CANH、CANL同名连接，通过杜邦线从单片机实验板上将电源接给CAN实验板。2、编写程序分别下载到各自的CAN实验板上，用杜邦线将JP的P2.0接地控制另一块板子的LED灯。五、实验预习要求阅读关于CAN和CAN器件SJA1000的基本资料，具备CAN和CAN相关器件的基本知识，学习指导书的参考程序。//CAN通信参考程序#include STC_NEW_8051.H#define uchar unsigned char#define uint unsigned int#define time0 -10000sfr WDT = 0xE1;sfr AUX = 0x8E;#define Raddr 1 //本机地址ID高8位#define Taddr 2 //目标地址ID高8位#define CAN_PORT P0 //CAN数据口//CAN2.0B的BasicCAN模式 (标准帧模式)#define CAN_CR 0 //控制#define CAN_CMR 1 //命令#define CAN_SR 2 //状态#define CAN_IR 3 //中断#define CAN_ACR 4 //验收#define CAN_AMR 5 //屏蔽#define CAN_BTR0 6 //时序0#define CAN_BTR1 7 //时序1#define CAN_OCR 8 //输出#define CAN_TXB 10 //发送缓冲#define CAN_RXB 20 //接收缓冲#define CAN_CDR 31 //分频ucharpdata CAN[32] _at_(0); //定位CAN寄存器地址sbit LED2 = P2^5;sbit LED1 = P2^6;sbit KEY = P2^0;bitCANBUS,sta,LED,RUN;uchartim;ucharidata TXB[10],RXB[10];void delay(uint p){while(p--);}void CAN_SEND() /*发送数据部分*/{uchari,p; p=CAN[CAN_SR];if (p0x04) { p=CAN_TXB; /*p指向发送缓存首址*/for(i=0;i10;i++) CAN[p++]=TXB[i]; CAN[CAN_CMR]=0x01; /*请求发送*/ }}void CAN_INT() interrupt 0 using 1/*接收中断*/{uchari,p; p=CAN[CAN_IR];if(p0x01) { p=CAN_RXB;for(i=0;i10;i++) { RXB[i]=CAN[p++]; } CAN[CAN_CMR]=0x04; /*释放接收缓存*/ CANBUS=1; }}void CAN_INI() /*初始化部分*/{CAN[CAN_CR]=0x01; CAN[CAN_ACR]=Raddr;CAN[CAN_AMR]=Raddr; CAN[CAN_BTR0]=0x07; CAN[CAN_BTR1]=0xff;CAN[CAN_OCR]=0x1A; CAN[CAN_CR]=0x02; }void timer0() interrupt 1 using 3{ TH0=time08;TL0=time0;if(tim250) tim++;}void main() { AUX=2; WDT=0x34; IE=0x83; IT0=1; TMOD=0x21; TH0=time08; TL0=time0; TR0=1; LED1=0;LED2=0;delay(5000); LED1=1;LED2=1;KEY=1; CAN_INI(); CANBUS=0;while(1) { WDT=0x34;if(tim10) {tim=0; TXB[0]=Taddr;TXB[1]=1;if(!KEY) TXB[2]=0; else TXB[2]=1; CAN_SEND(); } if(CANBUS) {