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#include <reg51.h>
#include"intrins.h"
sbit lcd_rs=P2^0;
sbit lcd_rw=P2^1;
sbit lcd_e=P2^2;
sbit led1=P1^0;
sbit led2=P1^1;
sbit led3=P1^2;
sbit key1=P1^4;
sbit key2=P1^5;
sbit key3=P1^6;
sbit key4=P1^7;
sbit so=P2^3;
sbit sclk=P2^4;
sbit cs=P2^5;
sbit motor=P3^0;
sbit jiare=P3^1;
sbit beep=P3^7;
unsigned char tr[]="0123456789";
unsigned char KeyValue=0,sz[4];
void Delay10ms(unsigned char delaytime)
{
unsigned char i, j,k;
for(k=0; k<delaytime; k++)
{
i = 20;
j = 113;
do
{
while (--j);
}
while (--i);
}
}
void delay(unsigned int x)
{
unsigned char i;
while(x--)
{
for(i=0;i<120;i++);
}
}
void lcd_write_cmd(unsigned char cmd) //寫命令函數(shù)
{
lcd_rs=0;
lcd_rw=0;
P0=cmd;
delay(5);
lcd_e=1;
delay(5);
lcd_e=0;
}
void lcd_write_date(unsigned char date) //寫數(shù)據(jù)函數(shù)
{
lcd_rs=1;
lcd_rw=0;
P0=date;
delay(5);
lcd_e=1;
delay(5);
lcd_e=0;
}
void lcd_init() //LCD初始化函數(shù)
{
lcd_write_cmd(0x38);
lcd_write_cmd(0x0c);
lcd_write_cmd(0x06);
lcd_write_cmd(0x01);
}
void Key_Scan()
{
KeyValue = 0;
if(key1 == 0) //增加按鍵按下
{
Delay10ms(1);
if(key1 == 0)
{
KeyValue = 1;
while(key1 == 0); //等待按鍵釋放
}
}
if(key2 == 0) //減少按鍵按下
{
Delay10ms(1);
if(key2 == 0)
{
KeyValue = 2;
while(key2 == 0); //等待按鍵釋放
}
}
if(key3 == 0) //減少按鍵按下
{
Delay10ms(1);
if(key3 == 0)
{
KeyValue = 3;
while(key3 == 0); //等待按鍵釋放
}
}
if(key4 == 0) //減少按鍵按下
{
Delay10ms(1);
if(key4 == 0)
{
KeyValue = 4;
while(key4 == 0); //等待按鍵釋放
}
}
}
unsigned int max6675_read() //讀取溫度值
{
unsigned char i;
unsigned long max_6675=0;
cs=1;
_nop_();
_nop_();
cs=0;
for(i=0;i<16;i++)
{
max_6675<<=1;
_nop_();
sclk=1;
if(so==1){max_6675=max_6675|0x01;}
else max_6675=max_6675|0x00;
_nop_();
sclk=0;
}
max_6675<<=1; //去掉最高位
max_6675>>=4; //去掉后3位保留14位溫度數(shù)據(jù)
max_6675=(max_6675+1)*1024/4096-24;
if(max_6675<=0){max_6675=0;}
return max_6675+1;
}
void max6675_display(unsigned int num) //顯示讀取到的溫度數(shù)值
{
// unsigned char sz[4];
unsigned char i;
sz[0]=num/1000;
sz[1]=num%1000/100;
sz[2]=num%1000%100/10;
sz[3]=num%10;
lcd_write_cmd(0x80); //寫命令函數(shù)
lcd_write_date('T');
lcd_write_date('e');
lcd_write_date('m');
lcd_write_date('p');
lcd_write_date(':');
for(i=1;i<4;i++)
{
lcd_write_date(0x30+sz[i]); //寫數(shù)據(jù)函數(shù)
}
delay(100);
}
void main()
{
unsigned char c=0;
unsigned int wendu,wenduh=300,wendul=100;
lcd_init();
max6675_read();
delay(100);//延時返回max6675狀態(tài)
while(1)
{
Key_Scan();
if(KeyValue==1)
wendul--;
else if(KeyValue==2)
wendul++;
else if(KeyValue==3)
wenduh--;
else if(KeyValue==4)
wenduh++;
wendu=max6675_read();
if(wendu>wenduh)
{
beep=0;
motor=0;
jiare=1;
}else if(wendu<wendul)
{
beep=0;
motor=1;
jiare=0;
}else {
beep=1;
motor=1;
jiare=1;
}
if(wendu>300)
{
led1=0;
led2=1;
led3=1;
}else if(wendu<100)
{
led1=1;
led2=0;
led3=1;
}else
{
led1=1;
led2=1;
led3=0;
}
lcd_write_cmd(0x80+0x40); //寫命令函數(shù)
lcd_write_date(wendul/100+0x30);
lcd_write_date(wendul%100/10+0x30);
lcd_write_date(wendul%10+0x30);
lcd_write_cmd(0x80+0x40+6); //寫命令函數(shù)
lcd_write_date(wenduh/100+0x30);
lcd_write_date(wenduh%100/10+0x30);
lcd_write_date(wenduh%10+0x30);
max6675_display(wendu);
}
}

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