#include <reg52.h>
#include <stdio.h>
#include <INTRINS.H>
#include <string.h>
#include <absacc.h>
#define uchar unsigned char
#define uint unsigned int
#define SJA_REG_BaseADD 0x7f00
#define REG_MODE XBYTE[SJA_REG_BaseADD + 0x00]
#define REG_CMD XBYTE[SJA_REG_BaseADD + 0x01]
#define REG_SR XBYTE[SJA_REG_BaseADD + 0x02]
#define REG_IR XBYTE[SJA_REG_BaseADD + 0x03]
#define REG_IR_ABLE XBYTE[SJA_REG_BaseADD + 0x04]
#define REG_BTR0 XBYTE[SJA_REG_BaseADD + 0x06]
#define REG_BTR1 XBYTE[SJA_REG_BaseADD + 0x07]
#define REG_OCR XBYTE[SJA_REG_BaseADD + 0x08]
#define REG_TEST XBYTE[SJA_REG_BaseADD + 0x09]
#define REG_ALC XBYTE[SJA_REG_BaseADD + 0x0b]
#define REG_ECC XBYTE[SJA_REG_BaseADD + 0x0c]
#define REG_EMLR XBYTE[SJA_REG_BaseADD + 0x0d]
#define REG_RXERR XBYTE[SJA_REG_BaseADD + 0x0e]
#define REG_TXERR XBYTE[SJA_REG_BaseADD + 0x0f]
#define REG_ACR0 XBYTE[SJA_REG_BaseADD + 0x10]
#define REG_ACR1 XBYTE[SJA_REG_BaseADD + 0x11]
#define REG_ACR2 XBYTE[SJA_REG_BaseADD + 0x12]
#define REG_ACR3 XBYTE[SJA_REG_BaseADD + 0x13]
#define REG_AMR0 XBYTE[SJA_REG_BaseADD + 0x14]
#define REG_AMR1 XBYTE[SJA_REG_BaseADD + 0x15]
#define REG_AMR2 XBYTE[SJA_REG_BaseADD + 0x16]
#define REG_AMR3 XBYTE[SJA_REG_BaseADD + 0x17]
#define REG_RxBuffer0 XBYTE[SJA_REG_BaseADD + 0x10]
#define REG_RxBuffer1 XBYTE[SJA_REG_BaseADD + 0x11]
#define REG_RxBuffer2 XBYTE[SJA_REG_BaseADD + 0x12]
#define REG_RxBuffer3 XBYTE[SJA_REG_BaseADD + 0x13]
#define REG_RxBuffer4 XBYTE[SJA_REG_BaseADD + 0x14]
#define REG_TxBuffer0 XBYTE[SJA_REG_BaseADD + 0x10]
#define REG_TxBuffer1 XBYTE[SJA_REG_BaseADD + 0x11]
#define REG_TxBuffer2 XBYTE[SJA_REG_BaseADD + 0x12]
#define REG_TxBuffer3 XBYTE[SJA_REG_BaseADD + 0x13]
#define REG_TxBuffer4 XBYTE[SJA_REG_BaseADD + 0x14]
#define REG_DataBuffer1 XBYTE[SJA_REG_BaseADD + 0x15]
#define REG_DataBuffer2 XBYTE[SJA_REG_BaseADD + 0x16]
#define REG_DataBuffer3 XBYTE[SJA_REG_BaseADD + 0x17]
#define REG_DataBuffer4 XBYTE[SJA_REG_BaseADD + 0x18]
#define REG_DataBuffer5 XBYTE[SJA_REG_BaseADD + 0x19]
#define REG_DataBuffer6 XBYTE[SJA_REG_BaseADD + 0x1a]
#define REG_DataBuffer7 XBYTE[SJA_REG_BaseADD + 0x1b]
#define REG_DataBuffer8 XBYTE[SJA_REG_BaseADD + 0x1c]
#define REG_RBSA XBYTE[SJA_REG_BaseADD + 0x1e]
#define REG_CDR XBYTE[SJA_REG_BaseADD + 0x1f]
#define REG_Receive_Counter XBYTE[SJA_REG_BaseADD + 0x1d]
sbit SJARst = P3 ^ 4; //复位控制
sbit LED = P3 ^ 5;
uchar temp_data1;
void MCU_Init(void);
void SJA_Init(void);
void SJA_Init_Reset(void);
void Light(void);
void Delay(uint n);
void Send(unsigned char S_Data);
void MCU_Init(void){
SJARst = 0;
LED = 1;
TMOD|=0x20; //定时器1设为方式2
TL1=0xFD; //定时器初值,9600
TH1=0xFD;
SCON=0x50; //串口设为方式1，REN=1允许接收
PX0=1; //设置外部中断0优先
IT0=0; //设置INT0为下降沿中断//0为电平触发，1为边沿触发
EX0=1; //使能INT0中断
//ES=1; //使能串口中断
RI = 0;
TI = 0;
PCON |= 0x00;
EA = 1;
TR1 = 1;
}
void SJA_Init_Reset(void) //复位可靠
{
unsigned char i;
for(i = 0;i < 125;i++);
SJARst = 1;
for(i = 0;i < 125;i++);
SJARst = 0;
for(i = 0;i < 125;i++);
}
void SJA_Init(void){
REG_MODE = 0x01; //进入复位模式
temp_data1 = REG_MODE;
temp_data1 = temp_data1 & 0x01;
if(temp_data1 == 0x01) //在复位模式中
REG_CDR = 0x88; //配置时钟分频寄存器，选择PeliCAN模式
REG_MODE = 0x0d ; //配置模式寄存器，选择单滤波（双滤波器设置0x05）、自检模式
REG_ACR0 = 0x00;
REG_ACR1 = 0x00;
REG_ACR2 = 0x00;
REG_ACR3 = 0x00;
REG_AMR0 = 0xff;
REG_AMR1 = 0xff;
REG_AMR2 = 0xff;
REG_AMR3 = 0xff;
REG_BTR0 = 0x00; //配置总线定时器0
REG_BTR1 = 0x16; //配置总线定时器1
REG_RBSA = 0x00; //缓存器起始地址寄存器设置为0
REG_CMD = 0x0c; //设置命令寄存器，清除数据溢出和释放接收缓冲器
REG_IR_ABLE = 0xff; //使能SJA1000接收/发送/错误中断功能
REG_OCR = 0x1a; //配置输出管脚
temp_data1 = REG_MODE;
temp_data1 = temp_data1 & 0x08;
if(temp_data1 == 0x08)
REG_MODE = 0x0c; //退出复位模式,进入工作模式
//REG_IR_ABLE = 0x03; //使能SJA1000接收/发送/错误中断功能
}
//*****************延时程序***************************//
void Delay(uint n)
{
unsigned int i;
while(n--)
for(i=125; i!=0; i--);
}
//**************************************************//
//*****************LED灯闪烁***************************//
void Light(void)
{
LED=1;
Delay(1000);
LED=0;
Delay(1000);
}
//**************************************************//
void Send(unsigned char S_Data){
SBUF=S_Data;
while(TI==0);
TI=0;
}
void ex0_int(void) interrupt 0 using 1
{
EA=0;
temp_data1 = REG_IR;
Send(temp_data1);
REG_CMD = 0x0c; //设置命令寄存器，清除数据溢出和释放接收缓冲器
EA=1;
}
main(){
SJA_Init_Reset();
MCU_Init();
Delay(100);
SJA_Init();
while(1){
REG_RxBuffer0= 0x08;//标准帧，八位数据
REG_RxBuffer1= 0x13;
REG_RxBuffer2= 0x00;
REG_RxBuffer3= 0x00;//数据第一位
REG_RxBuffer4= 0x01;
REG_DataBuffer1 = 0x02;
REG_DataBuffer2 = 0x03;
REG_DataBuffer3 = 0x04;
REG_DataBuffer4 = 0x05;
REG_DataBuffer5 = 0x06;
REG_DataBuffer6 = 0x07;
temp_data1 = REG_IR;
Send(temp_data1);
REG_CMD = 0x10;
}
}
已调试通过的程序，你可以通过查看寄存器（SR或IR）的值判断是否自检测成功
我也是参考了别人的。你上网搜下，类似列子很多的。
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楼主
