#include <reg52.h>						//頭文件
#include <stdio.h>

#define uint unsigned int

sbit HCPL = P2^2;						//光耦模塊HCPL-2601輸出控制
sbit BP = P1^3;							//蜂鳴器報(bào)警控制

uint CountT0;							//定時(shí)器T0中斷次數(shù)
uint CountINT0;						//外部中斷0次數(shù)

void timer0() interrupt 1					//定時(shí)器/計(jì)數(shù)器T0中斷服務(wù)例程
{
	TR0 = 0;							//停止計(jì)數(shù)

	TH0 = 19;						//重置初值
	TL0 = 136;

	CountT0++;						//定時(shí)器T0中斷次數(shù)加1

	if (CountT0>620)
	{
		if (CountINT0==1)				//如果外部中斷0次數(shù)為1，則認(rèn)為充電完畢
		{
			HCPL = 0;					//關(guān)閉MAX1898輸入電源
			BP = 0;					//觸發(fā)蜂鳴器報(bào)警
			printf("Bettery is charged over.");
		}
	    else							//否則，表示充電過(guò)程出錯(cuò)
		{
			HCPL = 1;					//保持MAX1898輸入電源
			BP = 1;					//蜂鳴器不報(bào)警
			printf("There is something error.");
		}
	
		ET0 = 0;       	 			//關(guān)閉定時(shí)器T0中斷
		EX0 = 0; 						//關(guān)閉外部中斷0

		CountINT0 = 0;					//計(jì)數(shù)器歸0
		CountT0 = 0;					//計(jì)數(shù)器歸0
	}
	else
{
		TR0 = 1;						//啟動(dòng)定時(shí)器T0計(jì)數(shù)
    }
}

void int0() interrupt 0						//外部中斷0服務(wù)例程
{
	if (CountINT0==0)					//定時(shí)器T0未中斷
	{
		TH0 = 19;					//設(shè)置定時(shí)初值
		TL0 = 136;
		CountT0 = 0;					//計(jì)數(shù)器歸0
		TR0 = 1;						//啟動(dòng)定時(shí)器/計(jì)數(shù)器0
	}
	CountINT0++;						//計(jì)數(shù)器歸0
}

void main()
{
	TMOD = 0x01;						//定時(shí)器模式1，T0為16位定時(shí)/計(jì)數(shù)器
	PT0 = 1;							//設(shè)置T0中斷為高優(yōu)先級(jí)
	IT0 = 1;							//設(shè)置外部中斷0為邊沿觸發(fā)

	ET0 = 1;							//打開(kāi)T0中斷
	EX0 = 1;							//打開(kāi)外部中斷0
	EA = 1;							//打開(kāi)CPU中斷
	
	HCPL = 1;		   					//MAX1898輸入電源，開(kāi)始充電
	BP = 1;							//關(guān)閉蜂鳴器

	CountINT0 = 0;						//計(jì)數(shù)器歸0
	CountT0 = 0;						//計(jì)數(shù)器歸0
	
	printf("Begin battery charge.");
	while(1)							//主循環(huán)，充電過(guò)程
	{
	}
}