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26.8后面的亂碼和字符都是定義了一個(gè)結(jié)構(gòu)體過后才有的 ，之前都沒有。
#include <reg52.h>
#include<stdlib.h>
#include<intrins.h>
extern bit Start18B20();
extern bit Get18B20Temp(int *temp);
extern void InitLcd1602();
extern void LcdShowStr(unsigned char *str);
extern void LcdSetCursor(unsigned char addr);
extern void LcdWriteDat(unsigned char dat);
extern void LcdWriteCmd(unsigned char del);
extern void keyscan();
extern unsigned char key,flag1;
unsigned char a[7];
/**************************************************************就是這個(gè)結(jié)構(gòu)體*****/
struct _pid{
float SV;//用戶設(shè)定溫度
float PV; //測量溫度
float KP; //比例常數(shù)
float T; //PID計(jì)算周期--采樣周期
float TI; //積分常數(shù)
float TD; //微分常數(shù)
float EK; //本次偏差
float EK_1;//上次偏差
float SEK; //歷史偏差之和
float IOUT;//積分輸出
float POUT; //比例輸出
float DOUT;//微分輸出
float OUT0; //0值輸出
float OUT; //pid輸出
unsigned int C10ms;//判斷是否滿足PID計(jì)算時(shí)間
unsigned int pwmcycle;//pwm周期
}PID;
void main()
{
unsigned char i,e=0;
unsigned char IntToString(unsigned char *str, int dat);
unsigned char m;
unsigned char code table[]={'0','1','2','3','4','5','6','7','8','9', '.','-',':',' ','=','.'};
bit res;
int temp; //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[5];
unsigned char stt[16] = {"T1:"};
unsigned char sty[16] = {"T2:"};
EA = 1; //開總中斷
Start18B20(); //啟動DS18B20
InitLcd1602(); //初始化液晶
LcdWriteCmd(0x0C); //關(guān)閉光標(biāo)閃爍
/*實(shí)時(shí)溫度*/
while(1)
{
/*顯示實(shí)時(shí)溫度標(biāo)識"T1:"*/
LcdSetCursor(0x00);
m = 0;
while(stt[m] != '\0')
{
LcdWriteDat(stt[m]);
m++;
}
/*顯示設(shè)定溫度標(biāo)識"T2:"*/
LcdSetCursor(0x40);
m = 0;
while(sty[m] != '\0')
{
LcdWriteDat(sty[m]);
m++;
}
res = Get18B20Temp(&temp); //讀取當(dāng)前溫度
if (res) //讀取成功時(shí)，刷新當(dāng)前溫度顯示
{
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 = (decT*10) / 16; //二進(jìn)制的小數(shù)部分轉(zhuǎn)換為1位十進(jìn)制位
str[len++] = decT + '0'; //十進(jìn)制小數(shù)位再轉(zhuǎn)換為ASCII字符
LcdShowStr(str); //顯示到液晶屏上
Start18B20();
/*設(shè)定溫度*/
keyscan();
if(flag1==1)
{
if(key<11) //10以下是數(shù)字顯示部分
{
LcdSetCursor(0x43+e++) ;
LcdWriteDat(table[key]);
a=table[key];
i++;
}
else if(key==11)
{
LcdWriteCmd(0x01) ; //刪除設(shè)定值
e=0;
for(i=0;i<7;i++)
{
a='0';
}
}
flag1=0; //鍵盤檢測標(biāo)志置0進(jìn)行下一次檢測
}
}
}
}
/* 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)，首先取絕對值，并在指針上添加負(fù)號
{
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 + '0';
}
*str = '\0'; //添加字符串結(jié)束符
return len; //返回字符串長度
}
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