bell.c

this progam is used with e_lock,and so on.

#include "Include.h"		
//硬件连接：
//蜂鸣器 P17 低电平有效		
extern unsigned char BellTimer;	
sbit BELL=P3^4;

void BellInit(void)
{
        BellOff();
}
void BellOn(void)
{
        BellTimer = 0;
        BELL=0;
}
void BellOff(void)
{
        BELL=1;
}