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標題: 在此程序基礎上怎么修改,使得LCD在溫度低于30時,顯示小數點后兩位高于時顯示一位 [打印本頁]

作者: SDCASCQW 時間: 2022-7-5 17:47
標題: 在此程序基礎上怎么修改,使得LCD在溫度低于30時,顯示小數點后兩位高于時顯示一位
單片機源程序如下:
#include <reg52.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
#define delayNOP() {_nop_();_nop_();_nop_();_nop_();}

sbit DQ = P3^3;
sbit LCD_RS = P2^0;
sbit LCD_RW = P2^1;
sbit LCD_EN = P2^2;

uchar code Temp_Disp_Title[]={"Current Temp : "};
uchar Current_Temp_Display_Buffer[]={" TEMP: "};

uchar code Temperature_Char[8] =
{
      0x0c,0x12,0x12,0x0c,0x00,0x00,0x00,0x00
};

uchar code df_Table[]=
{
      0,1,1,2,3,3,4,4,5,6,6,7,8,8,9,9
};

uint CurrentT = 0;
uchar Temp_Value[]={0x00,0x00};
uchar Display_Digit[]={0,0,0,0};
bit DS18B20_IS_OK = 1;

void DelayXus(uint x)
{
      uchar i;
      while(x--)
      {
               for(i=0;i<200;i++);
      }
}

bit LCD_Busy_Check()
{
      bit result;
      LCD_RS = 0;
      LCD_RW = 1;
      LCD_EN = 1;
      delayNOP();
      result = (bit)(P0&0x80);
      LCD_EN=0;
      return result;
}

void Write_LCD_Command(uchar cmd)
{
      while(LCD_Busy_Check());
      LCD_RS = 0;
      LCD_RW = 0;
      LCD_EN = 0;
      _nop_();
      _nop_();
      P0 = cmd;
      delayNOP();
      LCD_EN = 1;
      delayNOP();
      LCD_EN = 0;
}

void Write_LCD_Data(uchar dat)
{
      while(LCD_Busy_Check());
      LCD_RS = 1;
      LCD_RW = 0;
      LCD_EN = 0;
      P0 = dat;
      delayNOP();
      LCD_EN = 1;
      delayNOP();
      LCD_EN = 0;
}

void LCD_Initialise()
{
      Write_LCD_Command(0x01);
      DelayXus(5);
      Write_LCD_Command(0x38);
      DelayXus(5);
      Write_LCD_Command(0x0c);
      DelayXus(5);
      Write_LCD_Command(0x06);
      DelayXus(5);
}

void Set_LCD_POS(uchar pos)
{
      Write_LCD_Command(pos|0x80);
}

void Delay(uint x)
{
      while(--x);
}

uchar Init_DS18B20()
{
      uchar status;

      DQ = 0;
            Delay(90);
      DQ = 1;
            Delay(8);
      status = DQ;
      while(DQ==0);
      return status;
}

uchar ReadOneByte()
{
      uchar i,dat=0;

      for(i=0;i<8;i++)
      {
               DQ = 0;
                     dat >>= 1;
            DQ = 1;
                     _nop_(); _nop_();
            if(DQ) dat |= 0X80;
                     Delay(5);
            while(DQ==0);
      }
      return dat;
}

void WriteOneByte(uchar dat)
{
      uchar i;
      for(i=0;i<8;i++)
      {
               DQ = 0;
                     _nop_();
            DQ = dat& 0x01;
                     Delay(5);
            DQ = 1;
                     dat >>= 1;
      }
}

void Read_Temperature()
{
      if(Init_DS18B20()==1)
            DS18B20_IS_OK=0;
      else
      {
            WriteOneByte(0xcc);
            WriteOneByte(0x44);
            Init_DS18B20();
            WriteOneByte(0xcc);
            WriteOneByte(0xbe);
            Temp_Value[0] = ReadOneByte();
            Temp_Value[1] = ReadOneByte();
            DS18B20_IS_OK=1;
      }
}

void Display_Temperature()
{
      uchar i;
      uchar t = 150, ng = 0;
      if((Temp_Value[1]&0xf8)==0xf8)
      {
               Temp_Value[1] = ~Temp_Value[1];
            Temp_Value[0] = ~Temp_Value[0]+1;
            if(Temp_Value[0]==0x00)
                     Temp_Value[1]++;
            ng = 1;
      }
      Display_Digit[0] = df_Table[Temp_Value[0]&0x0f];
      CurrentT = ((Temp_Value[0]&0xf0)>>4) | ((Temp_Value[1]&0x07)<<4);
      Display_Digit[3] = CurrentT/100;
      Display_Digit[2] = CurrentT%100/10;
      Display_Digit[1] = CurrentT%10;
      Current_Temp_Display_Buffer[11] = Display_Digit[0] + '0';
      Current_Temp_Display_Buffer[10] = '.';
      Current_Temp_Display_Buffer[9]  = Display_Digit[1] + '0';
      Current_Temp_Display_Buffer[8]  = Display_Digit[2] + '0';
      Current_Temp_Display_Buffer[7]  = Display_Digit[3] + '0';
      if(Display_Digit[3] == 0)
            Current_Temp_Display_Buffer[7]  = ' ';
      if(Display_Digit[2] == 0&&Display_Digit[3]==0)
            Current_Temp_Display_Buffer[8]  = ' ';
      if(ng)
      {
               if(Current_Temp_Display_Buffer[8]  == ' ')
                     Current_Temp_Display_Buffer[8]  = '-';
            else if(Current_Temp_Display_Buffer[7]  == ' ')
                     Current_Temp_Display_Buffer[7]  = '-';
            else
                     Current_Temp_Display_Buffer[6]  = '-';
      }
      Set_LCD_POS(0x00);
      for(i=0;i<16;i++)
      {
            Write_LCD_Data(Temp_Disp_Title[ i]);
      }
      Set_LCD_POS(0x40);
      for(i=0;i<16;i++)
      {
            Write_LCD_Data(Current_Temp_Display_Buffer[ i]);
      }
      Set_LCD_POS(0x4d);
      Write_LCD_Data(0x00);
      Set_LCD_POS(0x4e);
      Write_LCD_Data('C');
}

void main()
{
      LCD_Initialise();
      Read_Temperature();
      Delay(50000);
      Delay(50000);
      while(1)
      {
               Read_Temperature();
            if(DS18B20_IS_OK)
                     Display_Temperature();
            DelayXus(100);
      }

}

6LWQN~}S1SIHSEWZ{1Y3IYN.png (49.32 KB, 下載次數: 14)

作者: xuyaqi 時間: 2022-7-6 16:07
看了你的程序，讀出的溫度就是整數，小數點及后面的0是顯示時加上去的，沒必要研究顯示兩個0還是一個0.

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