ex4.c

一个CAN学习程序

#include <p18f458.h>	// p18cxxx.h must have current processor
#include "CAN18XX8.h"	// Purpose of using AN738 Subroutine !!
#include "WAP_LCD.H"	
#include <stdlib.h>

	
void Delay_100(void) ;

char 	Temp_ASCII[10] ;
char	WaitOnBus ;

union
	{
		unsigned char	Bytes[2] ;
		unsigned int		Word ;	
	}     AD_ALL ;

	unsigned char 	Var1,Var2 ;

	unsigned long	TX_ID1 ;
	BYTE			TX_Data_Buf1[8] ;

	unsigned long	RX_ID1 ;
	BYTE			RX_Data_Buf1[8] ;
	BYTE			RX_Data_Len1	;
	enum 			CAN_RX_MSG_FLAGS	RX1_Message_Flag ; 	

	unsigned long	RX_ID2 ;
	BYTE			RX_Data_Buf2[8] ;
	BYTE			RX_Data_Len2	;
	enum 			CAN_RX_MSG_FLAGS	RX2_Message_Flag ; 			

#define 			OUTGOING_ID		0X210 
#define			INCOMING_ID 		0X200

#define			MESSAGE_ID1			0x100
#define			RX_Filter0			0x200
#define			RX_Filter1			0x00
#define			RX_Filter2			0x00
#define			RX_Filter3			0x00
#define			RX_Filter4			0x00
#define			RX_Filter5			0x00
#define			RXB0_MASK		0x7ff
#define			RXB1_MASK		0x7ff

void main( void )
{

	PORTD = 0x00 ;	
	TRISD =  0x00 ;
	TRISBbits.TRISB2 = 0 ;			// CANTX
	TRISBbits.TRISB3 = 1 ;			// CANRX
	
	CMCON = 0b00000111 ;			//  Disable Comparator Module 
	ADCON0 = 0b10000001 ;			//  Initial ADCON0 for A/D Module 
	ADCON1bits.ADFM = 1 ;		//  Right Justified !!

	
		OpenLCD( ) ;
	
		Delay_100( ) ;
		
		putrsLCD("FL=      IN=        ") ;
		LCD_Set_Cursor(0,1) ;
		putrsLCD("ID=      AD=      ") ;
		
		itoa ( MESSAGE_ID1 ,Temp_ASCII ) ;
		LCD_Set_Cursor(3,0) ;
		putsLCD(Temp_ASCII ) ;
		
		itoa (RX_Filter0,Temp_ASCII ) ;
		LCD_Set_Cursor(3,1) ;
		putsLCD(Temp_ASCII ) ;
	
	//
	// Initialize CAN Communication Module !!
	// The Sequence of Parameter is SJW,BRP,PHASEG1,PHASEG2,PROPSEG, Mode !!
	//
	
	CANInitialize(    2,8,3,3,1,		CAN_CONFIG_LINE_FILTER_OFF & 
									CAN_CONFIG_SAMPLE_ONCE & 
									CAN_CONFIG_ALL_MSG &
									CAN_CONFIG_PHSEG2_PRG_ON ) ;

	CANSetOperationMode(CAN_OP_MODE_CONFIG) ;

	CANSetMask(CAN_MASK_B1, RXB0_MASK, CAN_CONFIG_STD_MSG ) ;	// Set Mask For Standard Data Frame 
	CANSetMask(CAN_MASK_B2, RXB1_MASK, CAN_CONFIG_STD_MSG ) ;
	
	CANSetFilter(CAN_FILTER_B1_F1, RX_Filter0  , CAN_CONFIG_STD_MSG) ;
	CANSetFilter(CAN_FILTER_B1_F2, RX_Filter1  , CAN_CONFIG_STD_MSG) ;
	CANSetFilter(CAN_FILTER_B2_F1, RX_Filter2 , CAN_CONFIG_STD_MSG) ;
	CANSetFilter(CAN_FILTER_B2_F2, RX_Filter3  , CAN_CONFIG_STD_MSG) ;
	CANSetFilter(CAN_FILTER_B2_F3, RX_Filter4  , CAN_CONFIG_STD_MSG) ;
	CANSetFilter(CAN_FILTER_B2_F4, RX_Filter5  , CAN_CONFIG_STD_MSG) ;

	CANSetOperationMode(CAN_OP_MODE_LISTEN) ;
		
	//	糤