buzzer.c

来自「我写的针对lpc2141的ucos源码」· C语言 代码 · 共 21 行

#include <LPC214X.h>
#include "type.h"
#include "delay.h"

void buzzer(uint8 onoff)
{
	IODIR0|=1<<22;
	if(onoff==1) 
		IOCLR0|=1<<22;
	else if(onoff==0)
		IOSET0|=1<<22;
}

/* beep msecond milisecond */
void beep(uint16 msecond)
{
	buzzer(1);
	delay(1000*msecond);
	buzzer(0);
}