用PIC18F458的CAN模块实现CAN总线通信

　　#include

int CAN_FLAG;

voidinitcan(){

TRISB=(TRISB|0X08)&0XFB;

CANCON=0X80;

while(CANSTAT&0X80==0)continue;

BRGCON1=0X01;

BRGCON2=0X90;

BRGCON3=0X42;

TXB0CON=0X03;

TXB0SIDH=0XFF;

TXB0SIDL=0XE0;

TXB0DLC=0X08;

TXB0D0=0X00;

TXB0D1=0X01;

TXB0D2=0X02;

TXB0D3=0X03;

TXB0D4=0X04;

TXB0D5=0X05;

TXB0D6=0X06;

TXB0D7=0X07;

RXB0SIDH=0XFF;

RXB0SIDL=0XE0;

RXB0CON=0X20;

RXB0DLC=0X08;

RXB0D0=0X00;

RXB0D1=0X00;

RXB0D2=0X00;

RXB0D3=0X00;

RXB0D4=0X00;

RXB0D5=0X00;

RXB0D6=0X00;

RXB0D7=0X00;

RXF0SIDH=0XFF;

RXF0SIDL=0XE0;

RXM0SIDH=0X00;

RXM0SIDL=0X00;

CANCON=0X40;

while(CANSTAT&0X40==0)continue;

PIR3=0X00;

PIE3=0X01;

IPR3=0X01;

}

#pragma interrupt can_isr

#pragma code low_ISR=0x18

void low_ISR() {

_asm

gotocan_isr

_endasm

}

#pragma code

voidcan_isr() {

if(PIR3bits.RXB0IF==1)CAN_FLAG=1;

PIR3bits.RXB0IF=0;

RXB0CONbits.RXFUL=0;

}

main(){

INTCON=0x00;

initcan();

W D T C O N = 0 ;

INTCON=0xc0;

while(1) {

TXB0CONbits.TXREQ=1;

while(PIR3bits.TXB0IF!=1)continue;

while(CAN_FLAG==0)continue;

CAN_FLAG=0;

TXB0CONbits.TXREQ=0;

TXB0D0=RXB0D0+1;

TXB0D1=RXB0D1+1;

TXB0D2=RXB0D2+1;

TXB0D3=RXB0D3+1;

TXB0D4=RXB0D4+1;

TXB0D5=RXB0D5+1;

TXB0D6=RXB0D6+1;

TXB0D7=RXB0D7+1;

}

}