timer0isr.c

来自「FAT16 Filesystem on Philips LPC2000 seri」· C语言 代码 · 共 23 行

#include <types.h>
#include <LPC21xx.h>
#include <armVIC.h>
#include <system.h>
#include <sysdefs.h>


extern long systemTickCounter;
static int tickPrescale = 10;

void timer0ISR(void)
{// maintain system heartbeat timer.
		// ack the timer's interrupt source.
	T0IR = 1;
		// form the 10ms timer.
	if (!(--tickPrescale)) {
		tickPrescale = 10;
		systemTickCounter++;
	}
	VICVectAddr = 0x00000000;             // clear this interrupt from the VIC
}