inter.c

picc_18v 8.35pl35 PIC18系列单片机开发C编译器

#include <pic18.h>
#include "isr.h"

void init(void);
void update_priorities_enables(void);

volatile unsigned char HIGH_INT_REG;
volatile unsigned char LOW_INT_REG;

void main(void)
{
	static bit flash_leds;
	init();
	TMR1ON=1;
 
	while(1)
	{
		update_priorities_enables();
		
		if(TMR1IF)
		{
			TMR1IF=0;
			flash_leds=(!flash_leds);	/* LEDs will toggle updates */
			
			if(flash_leds)
			{
				PORTD=HIGH_INT_REG;	/* write interrupt indicators to LEDs */
				PORTE=LOW_INT_REG;
				HIGH_INT_REG=0;	/* clear interrupt indicators */
				LOW_INT_REG=0;
			}
			else
			{
				PORTD=0;	/* clear LED displays */
				PORTE=0;
			}

			TXREG2=0x01;
		}
	}
}


void init(void)
{
	ADCON1=0x0F;
	
/* Initiialse all peripherals */
	TRISA=0x03;	/* Enable switches need input mode */
	TRISB=0xFF;	/* BLUE DIP switch input */
	TRISC=0xFF;	/* RED DIP switch input */
	TRISD=0x00;	/* BLUE LED output */
	TRISE=0x00;	/* RED LED output */
	TRISG=0x00;	/* TX pin needs to be set to output */
	
	GIEH=OFF;
	GIEL=OFF;

	T1CON=0x01;		/* timer 1 used for LED updates */
	
	TMR2ON=1;
	TMR4ON=1;
	
	CCP2CON=0x0A;	/* set up all CCP modules to interrupt on Capture */
	CCP3CON=0x0A;
	CCP4CON=0x0A;
	CCP5CON=0x0A;

	TXEN2=1;	/* enable serial port 2 for transmission */
	SPEN2=1;
	
	T3CON=0x01;
	TMR3H=0x80;
	
	IPEN=1;		/* interrupt priorities are used */

}

void update_priorities_enables(void)
{
		if(RC0)TX2IP=1;
		else TX2IP=0;
		if(RC1)TMR2IP=1;
		else TMR2IP=0;
		if(RC2)TMR3IP=1;
		else TMR3IP=0;
		if(RC3)TMR4IP=1;
		else TMR4IP=0;
		if(RC4)CCP2IP=1;
		else CCP2IP=0;
		if(RC5)CCP3IP=1;
		else CCP3IP=0;
		if(RC6)CCP4IP=1;
		else CCP4IP=0;
		if(RC7)CCP5IP=1;
		else CCP5IP=0;
		TX2IE=RB0;
		TMR2IE=RB1;
		TMR3IE=RB2;
		TMR4IE=RB3;
		CCP2IE=RB4;
		CCP3IE=RB5;
		CCP4IE=RB6;
		CCP5IE=RB7;
		
		GIEH=RA0;
		GIEL=RA1;
}