ex6m.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) ;
void		Delay_10(void) ;
void		Show_Word_Hex ( unsigned char , unsigned char  , int ) ;

char 	Temp_ASCII[10] ;
char	WaitOnBus ;

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

union
	{
		unsigned char	Bytes[2] ;
		unsigned int		Word ;	
	}     Int2Byte ;

	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		0x200
#define			MESSAGE_ID2		0x88
#define			RX_Filter0			0x100
#define			RX_Filter1			0x00
#define			RX_Filter2			0x00
#define			RX_Filter3			0x00
#define			RX_Filter4			0x00
#define			RX_Filter5			0x00
#define			RXB0_MASK		0x700
#define			RXB1_MASK		0x700

#define			RTR_ID_MIN		0x81
#define			RTR_ID_MAX		0x88

#define			SW2		PORTBbits.RB0 
#define			SW3		PORTAbits.RA4

#define			TX_ID_MIN		0x100 
#define			TX_ID_MAX		0x170

void main( void )
{

	PORTD = 	0x00 ;	
	TRISD =  	0x00 ;
	TRISBbits.TRISB2 = 0 ;			// CANTX
	TRISBbits.TRISB3 = 1 ;			// CANRX
	TRISBbits.TRISB0 = 1 ;			// Switch 2 
	TRISAbits.TRISA4 = 1 ;			// Switch 3
	
	CMCON = 0b00000111 ;			//  Disable Comparator Module 
	ADCON0 = 0b10000001 ;			//  Initial ADCON0 for A/D Module 
	ADCON1bits.ADFM = 1 ;		//  Right Justified !!

	
		OpenLCD( ) ;
	
		Delay_100( ) ;
		
		putrsLCD("RTR ID =        ") ;
		LCD_Set_Cursor(0,1) ;
		putrsLCD("DATA =          ") ;
	
	//
	// 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_VALID_STD_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, 0x00000000  , CAN_CONFIG_STD_MSG) ;
	CANSetFilter(CAN_FILTER_B2_F1, 0x00000000 , CAN_CONFIG_STD_MSG) ;
	CANSetFilter(CAN_FILTER_B2_F2, 0x00000000  , CAN_CONFIG_STD_MSG) ;
	CANSetFilter(CAN_FILTER_B2_F3, 0x00000000  , CAN_CONFIG_STD_MSG) ;
	CANSetFilter(CAN_FILTER_B2_F4, 0x00000000  , CAN_CONFIG_STD_MSG) ;

	CANSetOperationMode(CAN_OP_MODE_NORMAL) ;
		

				TX_ID1 = TX_ID_MIN ;
				Show_Word_Hex ( 8 , 0 , (int) TX_ID1 ) ;

				LATD = 0x00 ;

	while (1)
	{


			Delay_100( ) ;

			if (  ! SW3  )
			{

					if ( CANIsTxReady( ) )
					CANSendMessage(	TX_ID1 ,TX_Data_Buf1,0,CAN_TX_PRIORITY_0 &
										CAN_TX_STD_FRAME &
										CAN_TX_RTR_FRAME ) ;

					Show_Word_Hex ( 8 , 0 , (int) TX_ID1 ) ;
			}

		Delay_10( ) ;
			
		if ( CANIsRxReady( ) )
		
		{
			CANReceiveMessage(&RX_ID1,RX_Data_Buf1,&RX_Data_Len1,&RX1_Message_Flag ) ;

							LCD_Set_Cursor(8,1) ;
							putrsLCD("     ") ;
							LCD_Set_Cursor(8,1) ;

								AD_ALL.Bytes[0] = RX_Data_Buf1[3] ;
								AD_ALL.Bytes[1] = RX_Data_Buf1[4] ;
			
							itoa ( AD_ALL.Word , Temp_ASCII ) ;
							putsLCD( Temp_ASCII ) ;

							LATD = AD_ALL.Word >> 2 ;

		}		

		if ( ! SW2 )
		{
				TX_ID1 += 0x10 ;
				if ( TX_ID1 > TX_ID_MAX )		TX_ID1 = TX_ID_MIN ;

				Show_Word_Hex ( 8 , 0 , (int) TX_ID1 ) ;

				while ( ! SW2 ) ;
		}
		
	}
	
}

void		Show_Word_Hex ( unsigned char CurX , unsigned char CurY , int Word_Value)
{
			LCD_Set_Cursor(CurX,CurY) ;
				putrsLCD("     ") ;
					LCD_Set_Cursor(CurX,CurY) ;

					Int2Byte.Word = Word_Value ;
				puthexLCD( Int2Byte.Bytes[1]) ;
			puthexLCD( Int2Byte.Bytes[0]) ;
}


void Delay_100(void)
{
	int  X1 ;

	for (X1 = 0 ; X1 < 10000 ; X1 ++ ) ;

}

void Delay_10(void)
{
	int  X1 ;

	for (X1 = 0 ; X1 < 100 ; X1 ++ ) ;

}


//************************************************
//*       #pragma Interrupt Declarations         *
//************************************************
#pragma interrupt isr_high 		//	save = PRODL,PRODH,FSR0L,FSR0H
#pragma interruptlow isr_low 		//	save = WREG,STATUS,BSR,PRODL,PRODH,FSR0L,FSR0H

//************************************************
//* Function: isr_high_direct                    *
//*   - Direct execution to the actual           *
//*     high-priority interrupt code.            *
//************************************************
#pragma code isrhighcode = 0x0000008

void isr_high_direct(void)	
{  
   //***EXERCISE 2 CODE HERE***
                         										
     _asm 		//begin in-line assembly
     goto isr_high	//go to isr_high function
     _endasm 		//end in-line assembly
}

#pragma code


//************************************************
//* Function: isr_low_direct                     *
//*   - Direct execution to the actual           *
//*     low-priority interrupt code.             *
//************************************************
#pragma code isrlowcode = 0x0000018

void isr_low_direct(void)
{  
   //***EXERCISE 2 CODE HERE***
                        										
     _asm 		//begin in-line assembly
     goto isr_low	//go to isr_high function
     _endasm		//end in-line assembly
}
#pragma code


//************************************************
//* Function: isr_high(void)                     *     
//*   High priority interrupt will               *
//************************************************
void isr_high(void)
{
 
}									


//************************************************
//* Function: isr_low(void)                      *
//*   Low priority interrupt will                *
//*   - Check cause of interrupt and             *
//************************************************
void isr_low(void)
{
 
}