can.c

2407例程.rar

#include    "f2407_c.h" 


#define LED port40                           
volatile ioport unsigned int port40;/*LED*/ 


unsigned int test_can(void);

void can_init(void)
{
	 *CAN_IFR=0xffff;
	  
	  
	   /*config CAN timer*/ 
	 *MCR=0x1000;
	 /**MCR=*MCR|0x1000;	/*set CCR=1*/
	 while(((*GSR)&0x0010)!=0x0010); 	/*if CCE=0 then wait*/
	 *BCR1=0x0023/*0x01ab*/;
	 *BCR2=0x0003;		/*can clk=1Mhz, 10 TQs*/ 
	 *MCR=(*MCR)&0xefff;          /*CCR=0;*/
	 while(((*GSR)&0x0010)==0x0010);  /*if CCE=1 then wait*/  
	 
	 
	 /*config mailbox*/
	 *MDER=0xff80;	/*box0-5 disabled*/ 
	 				/*box3 is receive box*/
	 
	 *MCR=(*MCR)|0x0100;		/*set CDR=1*/ 
	                            /*self-test mode*/
	 *MSGID4H=0x0555;
	 *MSGID4L=0xaaaa;		/*mailbox4 send*/
	 *MSGCTRL4=0x0008;		/*8 byte data */
	 *MBX4A=0x2222;
	 *MBX4B=0x5555;
	 *MBX4C=0xaaaa;
	 *MBX4D=0xeeee;
	 
	 
	
	 
	 

	 *MCR=(*MCR)&0xfeff;  	/*CDR=0;*/
	 
	 
} 
	                        	
	 
	 
unsigned int test_can(void)
{
	 unsigned int data_rec;
	 can_init();
	
	 *MDER=(*MDER)|0x0010;		/*enable mailbox4*/
	  
	 while(1)
	 {
	 *TCR=(*TCR)|0x0040;			/*TRS4=1*/
	 
	  while(((*TCR)&0x4000)!=0x4000);  	/*if TA4=0 then wait*/
	 *TCR=(*TCR)|0x4000;			/*set TA4=1*/ 
	 
	  }
	
	 
		 return(1);
}