pcf8591电压表，帮忙改一下，谢谢

ID:205697 · 发表于 2017-12-29 15:06

本帖最后由 123gkhkhkhkhgg 于 2017-12-29 15:08 编辑

#include<reg52.h>
#include<intrins.h>
#define AddWr 0x90
#define AddRd 0x91
#define uchar unsigned char
#define uint unsigned int

sbit Scl=P1^1;
sbit Sda=P1^2;

bit ADFlag;
uchar code Datatab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};  //0 1 2 3 4 5 6 7 8 9
data uchar Display[8];
uchar code wei[]={0xf8,0xf9,0xfa,0xfb,0xfc,0xfd};

void mDelay(uint j)
{
      unsigned int x,i;
      for(x=j;x>0;x--)
      {
            for(i=0;i<125;i++)
            {;}
      }
}

void Init_Timer1(void)
{
      TMOD|=0x10;
      TH1=0Xff;
      TH0=0x00;
      EA=1;
      ET1=1;
      TR1=1;
}

void Start(void)
{
      Sda=1;
      _nop_();
      Scl=1;
      _nop_();
      Sda=0;
      _nop_();
      Scl=0;
}

void Stop(void)
{
      Sda=0;
      _nop_();
      Scl=1;
      _nop_();
      Sda=1;
      _nop_();
      Scl=0;
}

void Ack(void)
{
      Sda=0;
      _nop_();
      Scl=1;
      _nop_();
      Scl=0;
      _nop_();
}

void NoAck(void)
{
      Sda=1;
      _nop_();
      Scl=1;
      _nop_();
      Scl=0;
      _nop_();
}

void Send(unsigned char Data)
{
      unsigned char BitCounter=8;
      unsigned char temp;
      do
      {
               temp=Data;
               Scl=0;
         _nop_();
            if((temp&0x80)==0x80)
            Sda=1;
            else
            Sda=0;
            Scl=1;
            temp=Data<<1;
            Data=temp;
            BitCounter--;
      }
      while(BitCounter);
               Scl=0;
}

unsigned char Read(void)
{
      unsigned char temp=0;
      unsigned char temp1=0;
      unsigned char BitCounter=8;
      Sda=1;
      do
      {
               Scl=0;
               _nop_();
               Scl=1;
         _nop_();
            if(Sda)
                     temp=temp|0x01;
               else
                     temp=temp&0xfe;
               if(BitCounter-1)
               {
                        temp1=temp1<<1;
                        temp=temp1;
               }
            BitCounter--;
      }
      while(BitCounter);
      return(temp);
}

void DAC(unsigned char Data)
{
      Start();
      Send(AddWr);
      Ack();
      Send(0x40);
      Ack();
      Send(Data);
      Ack();
      Stop();
}

unsigned char ReadADC()
{
      unsigned char Data;
      Start();
      Send(AddWr);
      Ack();
      Send(0x40);                //选择通道
      Ack();
      Start();
      Send(AddRd);
      Ack();
      Data=Read();
      Scl=0;
      NoAck();
      Stop();
      return Data;
}

void main()
{
      unsigned char num;
      uint ADtemp;
      int count;
      Init_Timer1();
      while(1)
      {
               DAC(num);
               num++;
               mDelay(20);
               if(ADFlag)
               {
                        ADFlag=0;
                        ADtemp=ReadADC()*2;                                        //0-512对应0-5v

                  Display[0]=Datatab[ADtemp/100]|0x80;          //整数部分和小数点（0x80）
                        Display[1]=Datatab[(ADtemp/10)%10];                //小数点后第一位
                     Display[2]=Datatab[ADtemp%10];                      //小数点后第二位
                     Display[3]=0x3e;                                                    //v

                     for(count=0;count<4;count++)
                     {
                              P0=Display[count];                               //数码管显示程序
                              P2=wei[count];
                     }
               }
      }
}

void Time1_isr(void) interrupt 3 using 1
{
      static unsigned int j=0;
      TH1=0xfb;
      TL1=0x00;
      j++;
      if(j==300)
      {
               j=0;
               ADFlag=1;       //采样
      }
}