怎么在下列 程序中 加入DS18B20超过30度后 报警的程序 求大神解答 急
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar code disp[]="0123456789";
uchar code disp2[]="Tempreture";
uchar code disp3[]="^C";
sbit lcden=P2^0;
sbit lcdrw=P2^1;
sbit lcdrs=P2^2;
sbit tempt=P2^3;
sbit Sounder=P2^5;
uint u_temp;
float f_temp;
void delay(uint x)
{
uint i,j;
for(i=0;i<x;i++)
for(j=0;j<130;j++);
}
void write_com(uchar com)
{
lcdrs=0;
P0=com;
delay(5);
lcden=1;
delay(5);
lcden=0;
delay(5);
}
void write_data(uchar date)
{
lcdrs=1;
P0=date;
delay(5);
lcden=1;
delay(5);
lcden=0;
delay(5);
}
void lcd_init()
{
lcden=0;
lcdrw=0;
write_com(0x38);
write_com(0x0c);
write_com(0x06);
write_com(0x01);
}
void display_tempt(uint date) //温度数据显示
{
uchar i,j,k;
i=date/100; //十位
j=date%100/10; //个位
k=date%100%10; //小数位
write_com(0x80+0x40+5);
write_data(disp[i]);
write_data(disp[j]);
write_data('.');
write_data(disp[k]);
}
void reset_tempt() //DS18B20复位，初始化
{
uint i;
tempt=0;
i=90; //延时
while(i>0)i--;
tempt=1;
i=4; //延时
while(i>0)i--;
}
bit read_bit() //读一位DS18B20数据
{
uint i;
bit dat;
tempt=0;
i++; //延时
tempt=1;
i++; //延时
i++;
dat=tempt;
i=8; //延时
while(i>0)i--;
return dat;
}
uchar read_tempt() //读一个字节DS18B20数据
{
uchar i,j,dat;
dat=0;
for(i=1;i<=8;i++)
{
j=read_bit();
dat=(j<<7)|(dat>>1); //将读取的数据位按读取先后顺序，
} //从低位到高位（从右往左）排列保存到dat
return dat;
}
void write_byte(uchar dat) //写一个字节数据到DS18B20
{
uint i;
uchar j;
bit testbit;
for(j=1;j<=8;j++)
{
testbit=dat&0x01; //每次只写一位数据
dat=dat>>1;
if(testbit)
{
tempt=0;
i++; //延时
tempt=1;
i=8;
while(i>0)i--;
}
else
{
tempt=0;
i=8; //延时
while(i>0)i--;
tempt=1;
i++; //延时
i++;
}
}
}
void convert_tempt() //DS18B20开始获取温度并进行转换
{
reset_tempt();
delay(1);
write_byte(0xcc);
write_byte(0x44);
}
uint get_tempt() //读取DS18B20寄存器中的温度数据
{
uchar a,b;
reset_tempt();
delay(1);
write_byte(0xcc);
write_byte(0xbe);
a=read_tempt();
b=read_tempt();
u_temp=b;
u_temp<<=8;
u_temp=u_temp|a;
f_temp=u_temp*0.0625; //精度为12位，所以分辨率为0.0625
u_temp=f_temp*10; //乘以10，将实际温度扩大10倍
return u_temp; //返回的u_temp是整型数据
}
void display() //静态文字显示
{
uchar i,j;
write_com(0x80+3);
for(i=0;i<10;i++)
{
write_data(disp2[i]);
}
for(j=0;j<2;j++)
{
write_data(disp3[j]);
}
}
void main()
{
uchar i;
lcd_init();
display();
while(1)
{
convert_tempt();
for(i=0;i<10;i++)
{
display_tempt(get_tempt());
}
}
}
