ccp.c

Hitech microchip PIC C18 Compiler

/*A sample project file to be used with HI-TIDE, to demonstrate the functionality of the microcontroller's CCPx.*/
/*Refer to ccp.txt for additional information*/

#include <pic18.h>
#include "ccp.h"
#include <stdio.h>

void init(void);
void putch(unsigned char);
volatile bit UPDATE_REQUIRED;																			/*used to indicate when to refresh output data*/
volatile char CURRENT_MODE1=0;																		/*used to indicate change CCP1CON register*/
volatile char CURRENT_MODE2=0;																		/*used to indicate change CCP2CON register*/
volatile bit SPECIAL_EVENT1=0;																			/*indicates  trigger event for CCP1*/
volatile bit SPECIAL_EVENT2=0;																			/*indicates  trigger event for CCP2*/
volatile bit CCP1INT=0;																							/*indicates that interrupt for CCP1 has occured*/
volatile bit CCP2INT=0;																							/*indicates that interrupt for CCP2 has occured*/

void main(void)
{
	init();
	while(1)
	{
		CCPR1L=DIP1;
		CCPR2L=DIP2;
		if (CCP1INT)
		{
			CCP1IE=0;
			printf("CCP1 interrupt occured\n");																/*report interrupt on CCP1*/	
			CCP1INT=0;  
			if (SPECIAL_EVENT1)
				{
					printf("CCP1 special event occured, TMR1 has been reset \n");		/*report special event on CCP1*/	
					SPECIAL_EVENT1=0;
				}
			CCP1IE=1;
		}	
		if (CCP2INT)
		{
			CCP2IE=0;
			printf("CCP2 interrupt occured\n");																/*report interrupt on CCP2*/	
			CCP2INT=0;  
			if (SPECIAL_EVENT2)
				{
					printf("CCP2 special event occured, TMR3 has been reset GODONE value is: %d \n",GODONE);	/*report special event on CCP2*/	
					SPECIAL_EVENT2=0;
				}
			CCP2IE=1;
		}
				
		if (UPDATE_REQUIRED)							   
			{
				LED1=CURRENT_MODE1+CURRENT_MODE2*16;									/*update LEDs that are used to display current status of CCPs*/
				
				CCP1CON=CURRENT_MODE1;																 /*update CCP1CON with new value*/
				CCP2CON=CURRENT_MODE2;																 /*update CCP2CON with new value*/
			
				printf("\n CCP1 STATUS\n----------------\n");											/*display status of CCP1*/
				switch (CURRENT_MODE1)
				{
				case 0 :{	  printf("Capture/Compare/PWM off \n");break;}
				case 2 :{  printf("Compare mode, toggle output on match,\n current value of  TRISC is %x \n",TRISC);	break;}
				case 3 :{  printf("Virtual CAN component is not implemented \n");break;}
				case 4 :{  printf("Capture mode, every falling edge\n");break;}
				case 5 :{  printf("Capture mode, every rising edge\n");	break;}
				case 6 :{  printf("Capture mode, every 4th rising edge\n");break;}
				case 7 :{  printf(" Capture mode, every 16th rising edge\n");break;}
				case 8 :{  printf("Compare mode,Initialize CCP pin Low, \non compare match force CCP pin High \n");	break;}
				case 9 :{  printf("Compare mode,Initialize CCP pin High, \non compare match force CCP pin Low\n");break;}
				case 10 :{printf("Compare mode,Generate software \ninterrupt on compare match. CCP pin is unaffected\n");break;}
				case 11 :{ printf("Compare mode,Trigger special \nevent (reset TMR1 or TMR3)\n");	break;}
				default : printf("\n unimplemented MODE \n");
				}
				printf("----------------");
				printf("\n CCP2 STATUS\n----------------\n");												/*display status of CCP2*/
				
				switch (CURRENT_MODE2)
				{
				case 0 :{	  printf("Capture/Compare/PWM off \n");break;}
				case 2 :{  printf("Compare mode, toggle output on match \n");	break;}
				case 3 :{  printf("Virtual CAN component is not implemented \n");break;}
				case 4 :{  printf("Capture mode, every falling edge\n");break;}
				case 5 :{  printf("Capture mode, every rising edge\n");	break;}
				case 6 :{  printf("Capture mode, every 4th rising edge\n");break;}
				case 7 :{  printf(" Capture mode, every 16th rising edge\n");break;}
				case 8 :{  printf("Compare mode,Initialize CCP pin Low, \non compare match force CCP pin High \n");	break;}
				case 9 :{  printf("Compare mode,Initialize CCP pin High, \non compare match force CCP pin Low\n");break;}
				case 10 :{printf("Compare mode,Generate software \ninterrupt on compare match. CCP pin is unaffected\n");break;}
				case 11 :{ printf("Compare mode,Trigger special \nevent (reset TMR1 or TMR3)\n");	break;}
				default : printf("\n unimplemented MODE \n");
				}				
				UPDATE_REQUIRED=0;	
			}
	 }
}

void init(void)
{

	T3CON=0xA1;																	/*T3CON controls TIMER3 AND selects which timer is used for each CCP*/ 			
	TMR3=0;																			/*Load initial value to TIMER3*/ 			
	TMR3ON=1;

	T1CON=0x81;																	/*use TIMER1 */ 			
	TMR1=0;																			/*Load initial value to TIMER1*/                          	
	TMR1ON=1;

	TRISB=0x30;																	/* Push button is connected to   RB4 to turn timers ON and OFF*/
	TRISD=0xFF;																	/* 8-bit DIP switch to set  value of CCP1*/
	TRISH=0xFF;																	/* 8-bit DIP switch to set  value of CCP2*/
	TRISF=0x00;																	/*  LED panels are connected to PORTF */
	TRISE=0x80;																	/* RE7 is IO pin for  CCP2*/
	TRISC=0x04;																	/* RC2 is IO pin for  CCP1*/
	
	ADCON1=0x0F;																/*configure pins of PORTF to be digital outputs*/																						
	PSPMODE=0;
	RBIE=1;																			/* enable PORTB interrupts to*/
	GIEH=1;																			/* allow interrupts from PUSH BUTTONS */
	GIEL=1;	
	
	TXEN=1;																			/* enable serial port transmissions */
	SPEN=1;				
	TXIE=0;																			/* not interrupt driven */		

	CCP1CON=0;																	/*initialise CCP1*/
	CCPR1=0;	
	CCP1IF=0;																			
	CCP1IE=1;																

	CCP2CON=0;																	/*initialise CCP2*/
	CCPR2=0;	
	CCP2IF=0;																			
	CCP2IE=1;																
	CURRENT_MODE1=0;
	CURRENT_MODE2=0;
	UPDATE_REQUIRED=1;
}

void putch(unsigned char c)
{
	TXREG=c;																		/* transmit a character to Serial IO */
	while(!TXIF)continue;
	TXIF=0;
}