#can_t.c

Cygnal公司的著名产品C8051f系列单片机

#include "can.h"
#define LEN 8
void transmit (char MsgNum,char *p,char len) 
/*将*p数据写入can消息发送，len为数据长度*/
{	char i;
	SFRPAGE = CAN0_PAGE;
	CAN0ADR = IF1CMDMSK;         
	CAN0DAT = 0x0087;            
	/*   IF1 Command Mask Registers  =0x0087
	WR/RD=1,Mask=0,Arb=0,Control=0,ClrIntPnd=0,TxRqst=1,DataA=1,DataB=1,一次发送8字节数据*/
	CAN0ADR = IF1DATA1;          
	for(i=0;i<len;i+=2){
		CAN0DATH=*p++;
		CAN0DATL=*p++;
	}
 	CAN0ADR = IF1CMDRQST;        
	CAN0DATL = MsgNum;            
}
void receive_data (uchar MsgNum,char *p,char len)
/*将接收数据存入*p指针中，len为接收长度*/
{
	char i;
  	SFRPAGE = CAN0_PAGE;
	CAN0ADR = IF2CMDMSK;       	
	CAN0DATL = 0x0F;          
	/*   IF1 Command Mask Registers  =0xxx1f
	WR/RD=0,Mask=0,Arb=0,Control=0,ClrIntPnd=1,TxRqst=1,DataA=1,DataB=1,一次发送8字节数据*/
	CAN0ADR = IF2CMDRQST;      
	CAN0DATL = MsgNum;       	  
	CAN0ADR = IF2DATA1;     	  
	for(i=0;i<len;i+=2){
		*p++=CAN0DATH;
		*p++=CAN0DATL;
	}
	isnewdata=1;
 }
void canini(){
	clear_msg_objects();
	init_msg_object_RX (0x04,1);//初始化发送
	init_msg_object_TX (0x02,2);
	init_msg_object_TX (0x03,4);
	EIE2 |= 0x20;
	EA = 1;
	SFRPAGE = CAN0_PAGE;
	CAN0CN=0X41;
	CAN0ADR=BITREG;
	CAN0DAT=0X34c0;//调波特率
	start_CAN();
}
void delay1ms(uint time){//延迟1ms*time,这不是一个精确值
	uint i;
	uint j;
	for (i=0;i<time;i++){
		for(j=0;j<300;j++);
	}
}	
void config(){
//看门狗禁止
	WDTCN = 0x07;	
    WDTCN = 0xDE;   
   	WDTCN = 0xAD;
	SFRPAGE = 0x0F;
//交叉开关使能，但没有进行外围设备配置
	XBR0 = 0x00;	
	XBR1 = 0x00;	
	XBR2 = 0x40;
 	XBR3 = 0x00;   
//管脚输出配置，P0口为开漏输出，其中P0.6接上拉电阻，P0为数字输入口
 	SFRPAGE = 0x0F;
 	P0MDOUT = 0x00; 
 	P1MDIN = 0xFF;  
//晶振配置，采用内部晶振8分频
	SFRPAGE = 0x0F;
 	CLKSEL = 0x00;  
	OSCXCN = 0x00;	
	OSCICN = 0x84;	
}
main(){
	xdata uchar ss1[8]={0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18};
	xdata uchar ss2[8]={0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28};
	config();
	canini();
	transmit(2,ss1,LEN);
	transmit(3,ss2,LEN);
	while(1);
}
void ISRname (void) interrupt 19

{	temppage=SFRPAGE;
   SFRPAGE = CAN0_PAGE;
   status = CAN0STA;
   if ((status&0x10) != 0){
	   CAN0STA&=0xef;
	  // receive_data (0x04);
   } 
   SFRPAGE=temppage;
}