想問一下這個MCU程序中的溫度計算公式是怎么來的?

ID:1124675 · 發表于 2024-6-19 19:06

#include<reg51.h>
#include <intrins.h>

#define Disdata P3
#define discan P0

sbit adrd=P2^7;       //IO口定義
sbit adwr=P2^6;
sbit csad=P2^4;
sbit  DIN=P3^7;    //LED小數點控制

unsigned char j,k,ad_data,t;
unsigned char dis[4]={0x00,0x00,0x00,0x00};

unsigned char code dis_7[12]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x40};
/* 共陽LED段碼表對應          "0"  "1"  "2"  "3"  "4"  "5"  "6"  "7"  "8"  "9" "不亮" "-" */
unsigned char code  scan_con[4]={0xfe,0xfd,0xfb,0xf7};    // 列掃描控制字

void delay(unsigned int t)
{
  for(;t>0;t--)
  {
;
  }
}  //11微秒延時函數

void scan()
{
char k;

for(k=0;k<4;k++)       //四位LED掃描控制
{
   Disdata=dis_7[dis[k]];
      if(k==1)
      {
         DIN=1;                               //加入小數點
      }
      discan=scan_con[k];
      delay(90);
      discan=0xff;
}
}
void ad0804()
{
  P1=0xff;             //讀取P1口之前先給其寫全1
  csad=0;             //選通ADCS
  adrd=0;             //AD讀使能
  ad_data=P1;                      //AD數據讀取賦給P1口
  adrd=1;
  csad=1;             //關閉ADCS
  adwr=0;
}

void ad_compute()    //u=2.55+T/100, 2.55反映在AD上為0x83
{
  unsigned char t_temp;

  //if(ad_data>=0x83)
  //{
ad_data=ad_data-0x83;
t_temp=ad_data*2-4;
      if(t_temp<=110)
      {
      dis[3]=t_temp/100;
      dis[2]=t_temp/10-dis[3]*10;
      dis[1]=t_temp%10;
      dis[0]=t%5*2;
      }
      else
      {
      t_temp=256-t_temp;
   dis[3]=11;
   dis[2]=t_temp/10;
   dis[1]=t_temp%10;
   dis[0]=t%5*2;
      }
//
//  }

}
void main()             //       主程序
{
  while(1)
  {
ad0804();
      ad_compute();
      scan();
  }
}