主程序代码如下,
#include <REGX52.H>
#include "LCD1602.h"
#include "DS18B20.h"
#include "Delay.h"
#include "AT24C02.h"
#include "Key.h"
#include "Timer0.h"
#include "UART.h"
#include <stdio.h>
float T,TShow;
char TLow,THigh;
unsigned char KeyNum;
void UART_SendFloat(float f)
{
unsigned char *p = (unsigned char *)&f;
int i;
// 可选:发送起始标志(例如0xAA)
UART_SendByte(0xAA);
// 发送4个字节(小端模式:低字节在前)
for(i = 0; i < 4; i++) {
UART_SendByte(p[i]);
}
// 可选:发送结束标志(例如0x55)
UART_SendByte(0x55);
}
void main()
{
DS18B20_ConvertT(); //上电先转换一次温度,防止第一次读数据错误
Delay(1000); //等待转换完成
THigh=AT24C02_ReadByte(0); //读取温度阈值数据
TLow=AT24C02_ReadByte(1);
if(THigh>125 || TLow<-55 || THigh<=TLow)
{
THigh=20; //如果阈值非法,则设为默认值
TLow=15;
}
LCD_Init();
UART_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(); //转换温度
T=DS18B20_ReadT(); //读取温度
if(T<0) //如果温度小于0
{
LCD_ShowChar(1,3,'-'); //显示负号
TShow=-T; //将温度变为正数
}
else //如果温度大于等于0
{
LCD_ShowChar(1,3,'+'); //显示正号
TShow=T;
}
LCD_ShowNum(1,4,TShow,3); //显示温度整数部分
LCD_ShowChar(1,7,'.'); //显示小数点
LCD_ShowNum(1,8,(unsigned long)(TShow*100)%100,2);//显示温度小数部分
UART_SendFloat(TShow);
Delay(500);
/*阈值判断及显示*/
if(KeyNum)
{
if(KeyNum==1) //K1按键,THigh自增
{
THigh++;
if(THigh>125){THigh=125;}
}
if(KeyNum==2) //K2按键,THigh自减
{
THigh--;
if(THigh<=TLow){THigh++;}
}
if(KeyNum==3) //K3按键,TLow自增
{
TLow++;
if(TLow>=THigh){TLow--;}
}
if(KeyNum==4) //K4按键,TLow自减
{
TLow--;
if(TLow<-55){TLow=-55;}
}
LCD_ShowSignedNum(2,4,THigh,3); //显示阈值数据
LCD_ShowSignedNum(2,12,TLow,3);
AT24C02_WriteByte(0,THigh); //写入到At24C02中保存
Delay(5);
AT24C02_WriteByte(1,TLow);
Delay(5);
}
if(T>THigh) //越界判断
{
LCD_ShowString(1,13,"OV:H");
}
else if(T<TLow)
{
LCD_ShowString(1,13,"OV:L");
}
else
{
LCD_ShowString(1,13," ");
}
}
}
void Timer0_Routine() interrupt 1
{
static unsigned int T0Count;
TL0 = 0x18; //设置定时初值
TH0 = 0xFC; //设置定时初值
T0Count++;
if(T0Count>=20)
{
T0Count=0;
Key_Loop(); //每20ms调用一次按键驱动函数
}
}
接受的串口通信就像图片那样
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