51单片机,18B20,1602温度计+串口通信，实际温度计上位机程序VS2010 C++ MFC -

#include <reg52.h>
#include "math.h"
bit flag1s = 0, _up = 0; //1s定时标志
unsigned char T0RH = 0; //T0重载值的高字节
unsigned char T0RL = 0; //T0重载值的低字节
void ConfigTimer0(unsigned int ms);
unsigned char IntToString(unsigned char *str, int dat);
extern bit Start18B20();
extern bit Get18B20Temp(int *temp);
extern void InitLcd1602();
extern void LcdShowStr(unsigned char x, unsigned char y, unsigned char *str);
//串口初始化函数
void InitUART()
{
//IP = 0x10;
TMOD &= 0x0F;
TMOD |= 0x20;
SCON = 0x50;
TH1 = 0xF3;
TL1 = TH1;
PCON = 0x00;
EA = 1;
ES = 1;
TR1 = 1;
}
//串口发送1字节数据
void SendOneByte(unsigned char c)
{
SBUF = c;
while(!TI);
TI = 0;
}
void main()
{
bit res;
int temp, former=0xffff; //读取到的当前温度值
int intT, decT; //温度值的整数和小数部分
unsigned char len;
unsigned char str[12];
IP = 0x10;
InitUART();
// EA = 1; //开总中断
ConfigTimer0(10); //T0定时10ms
Start18B20(); //启动DS18B20
InitLcd1602(); //初始化液晶
while (1)
{
if (flag1s || _up) //每秒更新一次温度
{
flag1s = 0;
res = Get18B20Temp(&temp); //读取当前温度
if (res && ((abs(temp-former) >= 4)||_up)) //读取成功时，刷新当前温度显示
{
former = temp; //记录新的温度
_up = 0;
SendOneByte((unsigned char) (temp/256));
SendOneByte((unsigned char) (temp%256));
intT = temp >> 4; //分离出温度值整数部分
decT = temp & 0xF; //分离出温度值小数部分
len = IntToString(str, intT); //整数部分转换为字符串
str[len++] = '.'; //添加小数点
decT = (int)((decT*100) * 0.0625 + 0.5); //二进制的小数部分转换为1位十进制位
str[len++] = decT/10 + '0'; //十进制小数位再转换为ASCII字符
str[len++] = decT%10 + '0';
str[len++] = 'C';
while (len < 7) //用空格补齐到6个字符长度
{
str[len++] = ' ';
}
str[len] = '\0'; //添加字符串结束符
LcdShowStr(0, 0, str); //显示到液晶屏上
}
else //读取失败时，提示错误信息
{
if(!res)
LcdShowStr(0, 0, "error!");
}
Start18B20(); //重新启动下一次转换
}
}
}
/* 整型数转换为字符串，str-字符串指针，dat-待转换数，返回值-字符串长度 */
unsigned char IntToString(unsigned char *str, int dat)
{
signed char i = 0;
unsigned char len = 0;
unsigned char buf[6];
if (dat < 0) //如果为负数，首先取绝对值，并在指针上添加负号
{
dat = -dat;
*str++ = '-';
len++;
}
do { //先转换为低位在前的十进制数组
buf[i++] = dat % 10;
dat /= 10;
} while (dat > 0);
len += i; //i最后的值就是有效字符的个数
while (i-- > 0) //将数组值转换为ASCII码反向拷贝到接收指针上
{
*str++ = buf[i] + '0';
}
*str = '\0'; //添加字符串结束符
return len; //返回字符串长度
}
/* 配置并启动T0，ms-T0定时时间 */
void ConfigTimer0(unsigned int ms)
{
unsigned long tmp; //临时变量
tmp = 12000000 / 12; //定时器计数频率
tmp = (tmp * ms) / 1000; //计算所需的计数值
tmp = 65536 - tmp; //计算定时器重载值
tmp = tmp + 15; //补偿中断响应延时造成的误差
T0RH = (unsigned char)(tmp>>8); //定时器重载值拆分为高低字节
T0RL = (unsigned char)tmp;
TMOD &= 0xF0; //清零T0的控制位
TMOD |= 0x01; //配置T0为模式1
TH0 = T0RH; //加载T0重载值
TL0 = T0RL;
ET0 = 1; //使能T0中断
TR0 = 1; //启动T0
}
/* T0中断服务函数，完成1秒定时 */
void InterruptTimer0() interrupt 1
{
static unsigned char tmr1s = 0;
TH0 = T0RH; //重新加载重载值
TL0 = T0RL;
tmr1s++;
if (tmr1s >= 100) //定时1s
{
tmr1s = 0;
if(!flag1s)
flag1s = 1;
}
}
//串口中断服务函数，
void UARTInterrupt(void) interrupt 4
{
char ch=0;
if(RI)
{
RI = 0;
ch = SBUF;
if((ch=='1') && !_up)
_up = 1;
//add your code here!
}/*
else
TI = 0;*/
}

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