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標(biāo)題: protues單片機(jī)數(shù)碼管顯示DS18B20,數(shù)據(jù)一直是00,會(huì)不會(huì)是延時(shí)時(shí)間出錯(cuò) [打印本頁(yè)]

作者: captaine 時(shí)間: 2022-12-4 10:31
標(biāo)題: protues單片機(jī)數(shù)碼管顯示DS18B20,數(shù)據(jù)一直是00,會(huì)不會(huì)是延時(shí)時(shí)間出錯(cuò)
單片機(jī)源程序如下:
#include <REGX51.H>
#include "intrins.h"

sbit DQ = P3^0;
uchar i;

int tem;
unsigned char NixieTable[] = {0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90};

void Nixie(unsigned char location,unsigned char number)
{
      P2 = 0x00;
            switch(location)
      {
            case 1:P2_0 = 1; P2_1 = 0; P2_2 = 0; P2_3 = 0; break;
            case 2:P2_0 = 0; P2_1 = 1; P2_2 = 0; P2_3 = 0; break;
            case 3:P2_0 = 0; P2_1 = 0; P2_2 = 1; P2_3 = 0; break;
            case 4:P2_0 = 0; P2_1 = 0; P2_2 = 0; P2_3 = 1; break;
      }
      P0 = NixieTable[number];
      Delay1ms(10);
}

int       DS18B20_Init(void)
{
      uint Ack;
      DQ = 1;
      Delay1us(10);

      DQ = 0;
      Delay1us(480);
      DQ = 1;
      Delay1us(40);

      Ack = DQ;
      return Ack;
}

void SendByte(uchar Byte)
{
      DQ=1;
      Delay1us(1);
      for(i=0;i<8;i++)
      {
            DQ=0;
            DQ=Byte&0x01;
            Delay1us(5);
            DQ=1;
            Byte>>=1;
      }
}

uchar RcvByte(void)
{
      uchar Byte;

      DQ=1;
      Delay1us(1);
      for (i=8;i>0;i--)
      {
            DQ=0;
            Byte>>=1;
            DQ=1;
            Delay1us(1);
            if(DQ)
            Byte|=0x80;
            Delay1us(30);
            DQ=1;

      }
      return Byte;
}
float Get_temp(void)
{
      uchar TL, TH;
      int temp;             float T;
      DS18B20_Init();
      SendByte(0xcc);
      SendByte(0x44);
      Delay1us(5);
            DS18B20_Init();
            SendByte(0xcc);
            SendByte(0x44);
            SendByte(0xBE);
      TL = RcvByte();
      TH = RcvByte();
      temp = (TH << 8) | TL;
      T = temp * 0.0625;
      return T;

}

void main()
{

      while(1)
      {
            tem = (int)Get_temp();
            Nixie(1,tem/10);
            Nixie(2,tem%10);
      }

}

屏幕截圖 2022-12-04 102858.png (53.82 KB, 下載次數(shù): 55)

作者: wc86110 時(shí)間: 2022-12-4 16:03
撇開(kāi)程序不說(shuō)單單溫度探頭復(fù)位電路都有點(diǎn)問(wèn)題

作者: captaine 時(shí)間: 2022-12-4 18:48
已經(jīng)改了，溫度是需要把那個(gè)電阻刪除嗎

作者: man1234567 時(shí)間: 2022-12-5 14:55
會(huì)不會(huì)是延時(shí)時(shí)間出錯(cuò) ？試試就知道了哈

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