单片机11-13

目录

蜂鸣器

蜂鸣器播放按键提示音

蜂鸣器播放音乐

AT24C02（IIC）总线

AT24C02数据存储

AT24C02秒表（定时器扫描按键）

DS18B20温度传感器（单总线）

温度显示

温度报警器

---

蜂鸣器

蜂鸣器播放按键提示音

Buzzer.c
 

#include 
#include "INTRINS.h"
#include "Delay.h"
//蜂鸣器端口
sbit Buzzer = P2^5;
	
	/**
  * @brief  蜂鸣器私有延迟函数，延时500us
  * @param  无
  * @retval 无
  */
	void Buzzer_Delay500us()		//@11.0592MHz
{
	unsigned char i;

	_nop_();
	i = 227;
	while (--i);
}

/**
  * @brief  蜂鸣器发生持续时间
  * @param  ms	发声时长
  * @retval 无
  */
void Buzzer_Time(unsigned int ms)
{
		unsigned int i;
	for(i = 0;i < ms *2;i++)//这里个人理解是持续时间（循环次数），如果要持续ms这么久
	//下面做一次就过去500us（0.5ms），要过去1000ms，则需要2000次，所以要*2
				{
					Buzzer = !Buzzer;
					Buzzer_Delay500us();//发出1000Hz频率声音
					//因为周期为1000微秒，即T = 0.001s，频率f = 1/T	，f = 1kHz
				}
}

main.c

#include 
#include "Delay.h"
#include "Key.h"
#include "Nixie.h"
#include "Buzzer.h"

unsigned char KeyNum;


void main(){
		Nixie(1,0);
	while( 1 ){
		KeyNum = Key();
		
		if(KeyNum){
			
			Buzzer_Time(1000);//响的时间
			Nixie(1,KeyNum);
			
		}
	}

}

蜂鸣器播放音乐

#include 
#include "Delay.h"
#include "Timer0.h"

sbit Buzzer = P2^5;

//播放速度，值为四分音符的时长(ms)
#define SPEED	500

//音符与索引对应表，P：休止符，L：低音，M：中音，H：高音，下划线：升半音符号#
#define P	0
#define L1	1
#define L1_	2
#define L2	3
#define L2_	4
#define L3	5
#define L4	6
#define L4_	7
#define L5	8
#define L5_	9
#define L6	10
#define L6_	11
#define L7	12
#define M1	13
#define M1_	14
#define M2	15
#define M2_	16
#define M3	17
#define M4	18
#define M4_	19
#define M5	20
#define M5_	21
#define M6	22
#define M6_	23
#define M7	24
#define H1	25
#define H1_	26
#define H2	27
#define H2_	28
#define H3	29
#define H4	30
#define H4_	31
#define H5	32
#define H5_	33
#define H6	34
#define H6_	35
#define H7	36

//索引与频率对照表
unsigned int FreqTable[]={
	0,
	63628,63731,63835,63928,64021,64103,64185,64260,64331,64400,64463,64528,
	64580,64633,64684,64732,64777,64820,64860,64898,64934,64968,65000,65030,
	65058,65085,65110,65134,65157,65178,65198,65217,65235,65252,65268,65283,
};

//曲谱以及持续时长
unsigned char code Music[]={
	P,4,
	P,4,
	P,4,
	M6,2,
	M7,2,
	
	H1,4+2,
	L7,2,
	H1,4,
	H3,4,
	
	M7,4+4+4,
	M3,2,
	M3,2,
	
	M6,4+2,
	
};

unsigned char FreqSelect,MusicSelect;

void main(){
	
	Timer0Init();
	
	while( 1 ){
		if(Music[MusicSelect] != 0xFF)
		{
			FreqSelect=Music[MusicSelect];
			MusicSelect++;
			Delay(SPEED/4*Music[MusicSelect]);
			MusicSelect++; 
			TR0 = 0;//关闭定时器
			Delay(5);
			TR0 = 1;//重启定时器
		}
		else
		{
			TR0 = 0;
				while(1);
		}
	}

}

void Timer0_Routine() interrupt 1{
	
	if(FreqTable[FreqSelect] != 0)
{
	TL0 = FreqTable[FreqSelect]%256;
	TH0 = FreqTable[FreqSelect]/256;
		Buzzer = !Buzzer;
}
	
	
}

AT24C02（IIC）总线

AT24C02数据存储

I2C.c(结合时序结构图进行理解)

#include 

 sbit I2C_SCL = P2^1;
 sbit I2C_SDA = P2^0;
 
 /**
  * @brief  I2C开始
  * @param  无
  * @retval 无
  */
 void I2C_Start(void)//起始条件
{
		I2C_SDA = 1;//初始化
		I2C_SCL = 1;//初始化
		I2C_SDA = 0;//SCL处于高电平期间拉低进行操作
		I2C_SCL = 0;//准备发送字节
}

/**
  * @brief  I2C停止
  * @param  无
  * @retval 无
  */
	void I2C_Stop(void)//终止条件
	{
		I2C_SDA = 0;//可能为1/0，保证为0进行操作
		I2C_SCL = 1;//高电平期间
		I2C_SDA = 1;//由低到高
		
	}
	
	/**
  * @brief  I2C发送一个字节
  * @param  Byte 	要发送的字节
  * @retval 无
  */
	void I2C_SendByte(unsigned char Byte)//发送一个字节
	{
		unsigned char i;
		for( i = 0; i<8; i++)
			{
				I2C_SDA = Byte & (0x80 >> i);//取出各位数据
				I2C_SCL = 1;//准备放入数据，拉高SCL
				I2C_SCL = 0;//马上拉低也能读到数据，准备放入下一位数据
				
			}
	}
	
	/**
  * @brief  I2C接收一个字节
  * @param  无
  * @retval Byte 接收到的一个字节数据
  */
	unsigned char I2C_ReceiveByte(void)
	{
		unsigned char i,Byte;
		I2C_SDA = 1;//释放总线
		
		for( i=0;i<8;i++)
		{
			I2C_SCL = 1;//进行拉高读取
			if(I2C_SDA)
				{
					Byte |= (0x80 >> i);//对八位进行相或运算Byte读出是几就是几
				}
			I2C_SCL = 0;//一位读取完毕，重置SCL，
		}

		return Byte;
	
	}
	
	/**
  * @brief  I2C发送应答
  * @param  AckBit 应答位，0为应答，1为非应答
  * @retval 无
  */
	void I2C_SendAck(unsigned int AckBit)
	{
			I2C_SDA = AckBit;
			I2C_SCL = 1;//拉高进行发送
			I2C_SCL = 0;//发送完成，恢复
	}
	
	/**
  * @brief  I2C接收应答位
  * @param  无
  * @retval AckBit 0为应答，1为非应答
  */
	unsigned char I2C_ReceiveAck(void)
	{
		unsigned char AckBit = 0;
		
		I2C_SDA = 1;//释放总线
		I2C_SCL = 1;//拉高进行接收
		
		AckBit = I2C_SDA;//将发送过来的数据存储
		
		I2C_SCL = 0;//结束接收
		
		return AckBit;
	}

AT24C02.c(结合数据帧最后一张ppt进行理解)

#include 
#include "I2C.H"

#define AT24C02_ADDRESS		0xA0

/**
  * @brief  AT24C02写入一个字节
  * @param  WorkAddress 要写入字节的地址
  * @param  Data 要写入的数据
  * @retval 无
  */
void AT24C02_WriteByte(unsigned char WorkAddress,Data)//字节写
	{
		unsigned char Ack;
		I2C_Start();//开始
		I2C_SendByte(AT24C02_ADDRESS);//SLAVEADRESS + w，从机地址
		I2C_ReceiveAck();//从机RA
		I2C_SendByte(WorkAddress);//写入字地址
		I2C_ReceiveAck();//从机RA
		I2C_SendByte(Data);//写入数据
		I2C_ReceiveAck();//从机RA
		I2C_Stop();//停止
	}
	
	
	/**
  * @brief  AT24C02读取一个字节
  * @param  WorkAddress 要读取字节的地址
  * @retval Data 读出的数据
  */
unsigned char AT24C02_ReadByte(unsigned char WorkAddress)//随机读
	{
		unsigned char Data;
		
		I2C_Start();//开始
		I2C_SendByte(AT24C02_ADDRESS);//SlaveAdress+W
		I2C_ReceiveAck();//RA
		I2C_SendByte(WorkAddress);//输入字地址
		I2C_ReceiveAck();//RA
		
		I2C_Start();//开始
		I2C_SendByte(AT24C02_ADDRESS | 0x01);//SlaveAdress+R
		I2C_ReceiveAck();//RA
		Data = I2C_ReceiveByte();//接收一个字节数据
		I2C_SendAck(1);//SA，结束接收
		I2C_Stop();//结束
		
		return Data;
	}

main.c

#include 
#include "Delay.h"
#include "AT24C02.h"
#include "Key.h"
#include "LCD1602.h"

unsigned char KeyNum;
unsigned int Num;

void main(){
	
	LCD_Init();
	LCD_ShowNum(1,1,Num,5);

	while( 1 ){
		KeyNum = Key();
		if(KeyNum == 1)//按下显示+1
			{
				Num++;
				LCD_ShowNum(1,1,Num,5);
			}
		if(KeyNum == 2)//按下显示-1
		{
			Num--;
			LCD_ShowNum(1,1,Num,5);
		}
		if(KeyNum == 3)//存储当前显示数据
		{
			AT24C02_WriteByte(0,Num%256);//存储低位
			Delay(5);
			AT24C02_WriteByte(1,Num/256);//存储高位
			Delay(5);
			LCD_ShowString(2,1,"Write ok");
			Delay(1000);
			LCD_ShowString(2,1,"        ");
		}
		if(KeyNum == 4)//读出内部存储的数据
		{
			Num = AT24C02_ReadByte(0);//取出低位
			Num |= (AT24C02_ReadByte(1) << 8);取出高位并将其合并
			LCD_ShowNum(1,1,Num,5);
			LCD_ShowString(2,1,"Read ok");
			Delay(1000);
			LCD_ShowString(2,1,"        ");
		}
	}

}

AT24C02秒表（定时器扫描按键）

main.c

#include 
#include "Delay.h"
#include "Key.h"
#include "Nixie.h"
#include "Timer0.h"
#include "I2C.h"
#include "AT24C02.h"
 
 unsigned char KeyNum ;
 unsigned char Min,Sec,MiNiSec;
  unsigned char RunFlag ;
	 
void main(){
	Timer0_Init();
	while( 1 ){
		KeyNum = Key();
			if(KeyNum == 1){//暂停
				RunFlag = !RunFlag; 
			}
			if(KeyNum == 2){//清零
				Min = 0;
				Sec = 0;
				MiNiSec = 0;
			}
			if(KeyNum == 3){//写入
				AT24C02_WriteByte(0,Min);
				Delay(5);//写周期
				AT24C02_WriteByte(1,Sec);
				Delay(5);
				AT24C02_WriteByte(2,MiNiSec);
				Delay(5);
			}
			if(KeyNum == 4){//读出
				Min = AT24C02_ReadByte(0);
				Sec = AT24C02_ReadByte(1);
				MiNiSec = AT24C02_ReadByte(2);
			}
		
			NiXie_SetBuf(1,Min / 10);//分高位
			NiXie_SetBuf(2,Min % 10);//分低位
			NiXie_SetBuf(3,10);//显示 -
			NiXie_SetBuf(4,Sec / 10);//秒高位
			NiXie_SetBuf(5,Sec % 10);//秒低位
			NiXie_SetBuf(6,10);//显示 -
			NiXie_SetBuf(7,MiNiSec / 10);
			NiXie_SetBuf(8,MiNiSec % 10);
	}

}

void Sec_Loop(void)//越界判断及处理
{
	if(RunFlag)//判断运行状态
	{
			MiNiSec ++;
		if(MiNiSec >= 100)
		{
			MiNiSec = 0;
			Sec ++;
			if(Sec >= 60)
			{
				Sec = 0;
				Min ++;
				if(Min >= 60)
				{
					Min = 0;
				}
			}
		}
	}
	

}


void Timer0_Routine() interrupt 1{
	static unsigned int T0Count1,T0Count2,T0Count3;
	T0Count1 ++;
	
	
	TL0 = 0x18;		//设置定时初值
	TH0 = 0xFC;		//设置定时初值（1ms）

	if( T0Count1 >= 20 ){//每隔20ms，扫描按键
		T0Count1 = 0;
		Key_Loop();
	}

	T0Count2 ++;
	if( T0Count2 >= 2 ){//每隔2ms，调用显示
		T0Count2 = 0;
		NiXie_Loop();
	}
	
	T0Count3 ++;
	if( T0Count3 >= 10 ){//每隔10ms，秒表进行运行自增
		T0Count3 = 0;
		Sec_Loop();
	}
}

Key.c

#include 
#include "Delay.h"

unsigned char Key_KeyNum;

/**
  * @brief  获取独立按键键码
  * @param  无
  * @retval 按下按键的键码，范围 0~4，无按键按下时，返回值为0
  */
unsigned char Key(void)
{
	unsigned char Temp = 0;
	Temp = Key_KeyNum;
	Key_KeyNum = 0;
	
	return Temp; 
}

/**
  * @brief  判断按下哪个按键
  * @param  无
  * @retval 无
  */
unsigned char Key_GetState(viod){
	unsigned char KeyNum = 0;
	
	if(P3_1 == 0){ KeyNum = 1;}
	if(P3_0 == 0){ KeyNum = 2;}
	if(P3_2 == 0){ KeyNum = 3;}
	if(P3_3 == 0){ KeyNum = 4;}
	return KeyNum;

}
	void Key_Loop(void)
{
	static unsigned char NowState , LastState;
	LastState = NowState;
	NowState = Key_GetState();
	if(LastState == 1 && NowState == 0)//按下按键1后松手
	{
		 Key_KeyNum = 1;
	}
	if(LastState == 2 && NowState == 0)//按下按键2后松手
	{
		 Key_KeyNum = 2;
	}
	if(LastState == 3 && NowState == 0)//按下按键3后松手
	{
		 Key_KeyNum = 3;
	}
	if(LastState == 4 && NowState == 0)//按下按键4后松手
	{
		 Key_KeyNum = 4;
	}
}

NiXie.c

#include 
#include "Delay.h"

unsigned char NiXie_Buf[9] = {0,10,10,10,10,10,10,10,10};
//初始化显示
unsigned char NixieTable [] = {0x3F,0x06,0x5B,0x4F,0x66,
	0x6D,0x7D,0x07,0x7F,0x6F,0x40};
//数字显示，以及 ‘-’ 显示

void NiXie_SetBuf(unsigned char Location,Number)
{
	NiXie_Buf[Location] = Number;//设置显示数字
}
void NiXie_Scan(unsigned char Location,Number){//检测哪个管亮以及亮多少
	
	P0 = 0x00;
	switch(Location){//位选
		case 1:
			P2_4 = 1;P2_3 = 1;P2_2 = 1;break;
		case 2:
			P2_4 = 1;P2_3 = 1;P2_2 = 0;break;
		case 3:
			P2_4 = 1;P2_3 = 0;P2_2 = 1;break;
		case 4:
			P2_4 = 1;P2_3 = 0;P2_2 = 0;break;
		case 5:
			P2_4 = 0;P2_3 = 1;P2_2 = 1;break;
		case 6:
			P2_4 = 0;P2_3 = 1;P2_2 = 0;break;
		case 7:
			P2_4 = 0;P2_3 = 0;P2_2 = 1;break;
		case 8:
			P2_4 = 0;P2_3 = 0;P2_2 = 0;break;
	}
	P0 = NixieTable[Number];//段选
	
}

void NiXie_Loop(void)//这个函数中不能出现delay函数
{
	static unsigned char i = 1;
	
 	NiXie_Scan(i,NiXie_Buf[i]);//不断扫描八个显示管
	i++;
	if(i>=9){i=1;}

}

DS18B20温度传感器（单总线）

温度显示

OneWire.c

#include 

sbit OneWire_DQ = P3^7;

/**
  * @brief  初始化单总线
  * @param  无
  * @retval 无
  */
unsigned char OneWire_Init(void)
{
	unsigned char AckBit,i;//应答位
	OneWire_DQ = 1;//初始化为高再拉低
	OneWire_DQ = 0;//拉低进入初始化状态
	
	i = 227;while (--i);//延迟500us
	
	OneWire_DQ = 1;//释放总线
	i = 29;while (--i);//延迟70us
	
	AckBit = OneWire_DQ;
	i = 227;while (--i);//延迟500us(超过480us即可)

	return AckBit;
}

/**
  * @brief  单总线传输一位数据
  * @param  Bit 被传输的一位数据
  * @retval 无
  */
void OneWire_SendBit( unsigned char Bit)
{
	unsigned char i;
	OneWire_DQ = 0;//直接拉低，初始化后是高
	i = 4;while (--i);//延时10us
	OneWire_DQ = Bit;//读取典型值
	i = 22;while (--i);//延时50us
	OneWire_DQ = 1;//完成后拉高
}

/**
  * @brief  接收一位数据
  * @param  无
  * @retval Bit	接收到的一位数据
  */
unsigned char OneWire_ReceiveBit(void)
{
	unsigned char Bit,i;
	
	OneWire_DQ = 0;
	i = 2;while (--i);//延时5us
	OneWire_DQ = 1;
	i = 2;while (--i);//延时5us
	Bit = OneWire_DQ;
	i = 22;while (--i);//延时50us,完成后总线应为1
	return Bit;
}

/**
  * @brief  传输一个字节
  * @param  Byte	被传输的字节
  * @retval 无
  */
void OneWire_SendByte(unsigned char Byte)
{
	unsigned char i;
	for( i=0;i<8;i++)
	{
		OneWire_SendBit(Byte & (0x01 << i));//从最低位开始传输
	}
}

/**
  * @brief  接收一个字节
  * @param  无
  * @retval Byte	接收到的字节
  */
unsigned char OneWire_ReceiveByte(void)
{
	unsigned char i;
	unsigned char Byte = 0x00;
	for( i=0;i<8;i++)
	{
		if(OneWire_ReceiveBit()){Byte |= (0x01<

DS18B20.c

#include 
#include "OneWire.h"

#define DS18B20_SKIP_ROM		0xCC
#define DS18B20_CONVERT_T		0x44
#define DS18B20_READ_SCRATCHPAD		0xBE

/**
  * @brief  转变温度
  * @param  无
  * @retval 无
  */
void DS18B20_ConvertT(void)//温度变换
{
	OneWire_Init();//初始化
	
	OneWire_SendByte(DS18B20_SKIP_ROM);//跳过ROM指令
	OneWire_SendByte(DS18B20_CONVERT_T);//开始温度变换
}

/**
  * @brief  读取温度
  * @param  无
  * @retval T 浮点型温度数据
  */
float DS18B20_ReadT(void)//温度读取,负数的温度是以补码形式存储的
{
	unsigned char TLSB,TMSB;
	int Temp;
	float T;
	
	OneWire_Init();//初始化

	OneWire_SendByte(DS18B20_SKIP_ROM);//跳过ROM指令
	OneWire_SendByte(DS18B20_READ_SCRATCHPAD);//读暂存器
	
	TLSB = OneWire_ReceiveByte();//低位
	TMSB = OneWire_ReceiveByte();//高位
	
	Temp = (TMSB << 8) | TLSB; //合并高低位并强转为有符号类型，有移位相当于扩大16倍
	T = Temp / 16.0;//还原并防止精度损失
	
	return T;
}
	

main.c

#include 
#include "LCD1602.h"
#include "Delay.h"
#include "DS18B20.h"

float T;

void main(){
	
	LCD_Init();
	LCD_ShowString(1,1,"Temperature:");
	
	
	while( 1 ){
		DS18B20_ConvertT();//转变温度
		T = DS18B20_ReadT();//读取温度
		
		if(T < 0)
		{
			LCD_ShowChar(2,1,'-');
			T = -T;//转为正值，进行显示
		}else
		{
			LCD_ShowChar(2,1,'+');
		}
		LCD_ShowNum(2,2,T,3);//整数部分
		LCD_ShowChar(2,5,'.');
		LCD_ShowNum(2,6,(unsigned long)(T*10000) % 10000,4);//小数部分
	}

}

温度报警器

OneWire.c

#include 

sbit OneWire_DQ = P3^7;

/**
  * @brief  初始化单总线
  * @param  无
  * @retval 无
  */
unsigned char OneWire_Init(void)
{
	unsigned char AckBit,i;//应答位
	EA = 0;//防止延时被打断，屏蔽中断
	OneWire_DQ = 1;//初始化为高再拉低
	OneWire_DQ = 0;//拉低进入初始化状态
	
	i = 227;while (--i);//延迟500us
	
	OneWire_DQ = 1;//释放总线
	i = 29;while (--i);//延迟70us
	
	AckBit = OneWire_DQ;
	i = 227;while (--i);//延迟500us(超过480us即可)

	EA = 1;//执行完成后，将计时器还原
	return AckBit;
}

/**
  * @brief  单总线传输一位数据
  * @param  Bit 被传输的一位数据
  * @retval 无
  */
void OneWire_SendBit( unsigned char Bit)
{
	unsigned char i;
	EA = 0;//防止延时被打断，屏蔽中断
	OneWire_DQ = 0;//直接拉低，初始化后是高
	i = 4;while (--i);//延时10us
	OneWire_DQ = Bit;//读取典型值
	i = 22;while (--i);//延时50us
	OneWire_DQ = 1;//完成后拉高
	EA = 1;//执行完成后，将计时器还原
}

/**
  * @brief  接收一位数据
  * @param  无
  * @retval Bit	接收到的一位数据
  */
unsigned char OneWire_ReceiveBit(void)
{
	unsigned char Bit,i;
	EA = 0;//防止延时被打断，屏蔽中断
	
	OneWire_DQ = 0;
	i = 2;while (--i);//延时5us
	OneWire_DQ = 1;
	i = 2;while (--i);//延时5us
	Bit = OneWire_DQ;
	i = 22;while (--i);//延时50us,完成后总线应为1
	EA = 1;//执行完成后，将计时器还原
	return Bit;
}

/**
  * @brief  传输一个字节
  * @param  Byte	被传输的字节
  * @retval 无
  */
void OneWire_SendByte(unsigned char Byte)
{
	unsigned char i;
	for( i=0;i<8;i++)
	{
		OneWire_SendBit(Byte & (0x01 << i));//从最低位开始传输
	}
}

/**
  * @brief  接收一个字节
  * @param  无
  * @retval Byte	接收到的字节
  */
unsigned char OneWire_ReceiveByte(void)
{
	unsigned char i;
	unsigned char Byte = 0x00;
	for( i=0;i<8;i++)
	{
		if(OneWire_ReceiveBit()){Byte |= (0x01<

main.c

#include 
#include "DS18B20.h"
#include "LCD1602.h"
#include "AT24C02.h"
#include "Delay.h"
#include "Key.h"
#include "Timer0.h"

float T,TShow;//温度与显示温度
char TLow,THigh;//低阈值，高阈值
unsigned char KeyNum;//获取到的键码

void main(){
	DS18B20_ConvertT();
	Delay(1000);
	THigh = AT24C02_ReadByte(0);//读取内部存储的高阈值
	TLow = AT24C02_ReadByte(1);//读取内部存储的低阈值
	
	if(THigh > 125 || TLow < -55 || THigh <= TLow)
	{
		THigh = 20;
		TLow = 15;
	}
	
	LCD_Init();
	LCD_ShowString(1,1,"T:");
	
	LCD_ShowString(2,1,"TH:");
	LCD_ShowString(2,9,"TL:");
	
	LCD_ShowSignedNum(2,4,THigh,3);
	LCD_ShowSignedNum(2,12,TLow,3);
	
	Timer0_Init();
	
	
	while( 1 ){
		KeyNum = Key();
		
		/*温度读取及显示*/
		DS18B20_ConvertT();
		T = DS18B20_ReadT();
		
		if(T < 0)//零下
		{
			LCD_ShowChar(1,3,'-');
			TShow = -T;//转为正值
		}else
		{
			LCD_ShowChar(1,3,'+');
			TShow = T;
		}
		LCD_ShowNum(1,4,TShow,3);//整数部分
		LCD_ShowChar(1,7,'.');
		LCD_ShowNum(1,8,(unsigned long)(T*100)%100,2);//小数部分
		
		/*阈值判断及显示*/
		if(KeyNum)
			{
					if(KeyNum == 1)//增加高阈值
				{
					THigh++;
					if(THigh > 125)
					{THigh = 125;}
				}
				if(KeyNum == 2)//降低高阈值
				{
					THigh--;
					if(THigh <= TLow)
					{THigh ++;}
				}
				if(KeyNum == 3)//增加低阈值
				{
					TLow++;
					if(TLow >= THigh)
					{TLow -- ;}
				}
				if(KeyNum == 4)//降低低阈值
				{
					TLow--;
					if(TLow < -55)
					{TLow = -55;}
				}
			
				LCD_ShowSignedNum(2,4,THigh,3);
				LCD_ShowSignedNum(2,12,TLow,3);
			
				AT24C02_WriteByte(0,THigh);//写入高阈值
				Delay(5);//写周期
				AT24C02_WriteByte(1,TLow);//写入低阈值
				Delay(5);//写周期
			}

		if(T > THigh)
		{
			LCD_ShowString(1,13,"OV:H");
		}else if(T < TLow)
		{
			LCD_ShowString(1,13,"OV:L");
		}else
		{
			LCD_ShowString(1,13,"OV: ");
		}
	}
}

//中断函数
void Timer0_Routine() interrupt 1{
	static unsigned int T0Count;
	T0Count ++;
	TL0 = 0x18;		//设置定时初值
	TH0 = 0xFC;		//设置定时初值
	if( T0Count >= 20 ){
		T0Count = 0;
		Key_Loop();
	}

}