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#include <reg52.h>
#include "math.h"
bit flag1s = 0, _up = 0; //1s定時(shí)標(biāo)志
unsigned char T0RH = 0; //T0重載值的高字節(jié)
unsigned char T0RL = 0; //T0重載值的低字節(jié)
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);
//串口初始化函數(shù)
void InitUART()
{
//IP = 0x10;
TMOD &= 0x0F;
TMOD |= 0x20;
SCON = 0x50;
TH1 = 0xF3;
TL1 = TH1;
PCON = 0x00;
EA = 1;
ES = 1;
TR1 = 1;
}
//串口發(fā)送1字節(jié)數(shù)據(jù)
void SendOneByte(unsigned char c)
{
SBUF = c;
while(!TI);
TI = 0;
}
void main()
{
bit res;
int temp, former=0xffff; //讀取到的當(dāng)前溫度值
int intT, decT; //溫度值的整數(shù)和小數(shù)部分
unsigned char len;
unsigned char str[12];
IP = 0x10;
InitUART();
// EA = 1; //開總中斷
ConfigTimer0(10); //T0定時(shí)10ms
Start18B20(); //啟動(dòng)DS18B20
InitLcd1602(); //初始化液晶
while (1)
{
if (flag1s || _up) //每秒更新一次溫度
{
flag1s = 0;
res = Get18B20Temp(&temp); //讀取當(dāng)前溫度
if (res && ((abs(temp-former) >= 4)||_up)) //讀取成功時(shí)，刷新當(dāng)前溫度顯示
{
former = temp; //記錄新的溫度
_up = 0;
SendOneByte((unsigned char) (temp/256));
SendOneByte((unsigned char) (temp%256));
intT = temp >> 4; //分離出溫度值整數(shù)部分
decT = temp & 0xF; //分離出溫度值小數(shù)部分
len = IntToString(str, intT); //整數(shù)部分轉(zhuǎn)換為字符串
str[len++] = '.'; //添加小數(shù)點(diǎn)
decT = (int)((decT*100) * 0.0625 + 0.5); //二進(jìn)制的小數(shù)部分轉(zhuǎn)換為1位十進(jìn)制位
str[len++] = decT/10 + '0'; //十進(jìn)制小數(shù)位再轉(zhuǎn)換為ASCII字符
str[len++] = decT%10 + '0';
str[len++] = 'C';
while (len < 7) //用空格補(bǔ)齊到6個(gè)字符長度
{
str[len++] = ' ';
}
str[len] = '\0'; //添加字符串結(jié)束符
LcdShowStr(0, 0, str); //顯示到液晶屏上
}
else //讀取失敗時(shí)，提示錯(cuò)誤信息
{
if(!res)
LcdShowStr(0, 0, "error!");
}
Start18B20(); //重新啟動(dòng)下一次轉(zhuǎn)換
}
}
}
/* 整型數(shù)轉(zhuǎn)換為字符串，str-字符串指針，dat-待轉(zhuǎn)換數(shù)，返回值-字符串長度 */
unsigned char IntToString(unsigned char *str, int dat)
{
signed char i = 0;
unsigned char len = 0;
unsigned char buf[6];
if (dat < 0) //如果為負(fù)數(shù)，首先取絕對(duì)值，并在指針上添加負(fù)號(hào)
{
dat = -dat;
*str++ = '-';
len++;
}
do { //先轉(zhuǎn)換為低位在前的十進(jìn)制數(shù)組
buf[i++] = dat % 10;
dat /= 10;
} while (dat > 0);
len += i; //i最后的值就是有效字符的個(gè)數(shù)
while (i-- > 0) //將數(shù)組值轉(zhuǎn)換為ASCII碼反向拷貝到接收指針上
{
*str++ = buf[i] + '0';
}
*str = '\0'; //添加字符串結(jié)束符
return len; //返回字符串長度
}
/* 配置并啟動(dòng)T0，ms-T0定時(shí)時(shí)間 */
void ConfigTimer0(unsigned int ms)
{
unsigned long tmp; //臨時(shí)變量
tmp = 12000000 / 12; //定時(shí)器計(jì)數(shù)頻率
tmp = (tmp * ms) / 1000; //計(jì)算所需的計(jì)數(shù)值
tmp = 65536 - tmp; //計(jì)算定時(shí)器重載值
tmp = tmp + 15; //補(bǔ)償中斷響應(yīng)延時(shí)造成的誤差
T0RH = (unsigned char)(tmp>>8); //定時(shí)器重載值拆分為高低字節(jié)
T0RL = (unsigned char)tmp;
TMOD &= 0xF0; //清零T0的控制位
TMOD |= 0x01; //配置T0為模式1
TH0 = T0RH; //加載T0重載值
TL0 = T0RL;
ET0 = 1; //使能T0中斷
TR0 = 1; //啟動(dòng)T0
}
/* T0中斷服務(wù)函數(shù)，完成1秒定時(shí) */
void InterruptTimer0() interrupt 1
{
static unsigned char tmr1s = 0;
TH0 = T0RH; //重新加載重載值
TL0 = T0RL;
tmr1s++;
if (tmr1s >= 100) //定時(shí)1s
{
tmr1s = 0;
if(!flag1s)
flag1s = 1;
}
}
//串口中斷服務(wù)函數(shù)，
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;*/
}

復(fù)制代碼

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