intr.c

来自「MICROCHIP pic-demo板 液晶官方驱动」· C语言 代码 · 共 40 行

#include	<pic.h>

/*
 *	Interrupt test for PIC 
 *
 *	Copyright (C)1997 HI-TECH Software.
 *	Freely distributable.
 */

static long	count;
static bit	bad_intr;

void
main(void)
{
	/* setup stuff */

#ifdef	_16C71
	ADCON1 = 3;		// 16C71 requires Port A reconfiguration
#endif
	T0CS = 0;		// Timer increments on instruction clock
	TRISA = 0xFE;		// Port A bit 0 is output 
	T0IE = 1;		// Enable interrupt on TMR0 overflow
	GIE = 1;		// Global interrupt enable
	for(;;)
		CLRWDT();	// Idly kick the dog
}

static void interrupt
isr(void)			// Here be interrupt function - the name is
				// unimportant.
{
	if(!T0IF)		// Was this a timer overflow?
		bad_intr = 1;	// NO! Shock horror!
	count++;		// Add 1 to count - insert idle comment
	T0IF = 0;		// Clear interrupt flag, ready for next
	PORTA ^= 1;		// toggle bit 0 of Port A, to show we're alive
}