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      EEPW首頁(yè) > 嵌入式系統(tǒng) > 設(shè)計(jì)應(yīng)用 > 基于IIC總線的AD轉(zhuǎn)換模塊PCF8591

      基于IIC總線的AD轉(zhuǎn)換模塊PCF8591

      作者: 時(shí)間:2016-12-02 來(lái)源:網(wǎng)絡(luò) 收藏

      uchar read_adc(uchar channel)
      {
      uchar temp;
      start();
      send_byte(addw);
      ack();
      send_byte(0x40|channel);
      ack();
      start();
      send_byte(addr);
      ack();
      temp=read_byte();
      Noack();
      stop();
      return temp;

      }

      void init()
      {
      scl=1;
      sda=1;
      }

      /*********1602程序********************/

      void write_com(uchar com)
      {
      rs=0;
      rw=0;
      en=0;
      P0=com;
      delayms(2);
      en=1;
      delayms(2);
      en=0;
      }


      void write_dat(uchar dat)
      {
      rs=1;
      rw=0;
      en=0;
      P0=dat;
      delayms(2);
      en=1;
      delayms(2);
      en=0;
      }

      void zfc(uchar *p)
      {
      while(*p!=0)
      write_dat(*p++);
      }

      void init_1602()
      {
      write_com(0x38);
      delayms(2);
      write_com(0x0c);
      delayms(2);
      write_com(0x06);
      delayms(2);
      write_com(0x01);
      write_com(0x80);
      zfc("Channel 0 :");
      write_com(0x80+0x40);
      zfc("Channel 1 :");
      }

      void display()
      {
      uchar a0,a1,a2,b0,b1,b2;
      a0=Ch0value*196/10000;
      a1=Ch0value*196%10000/1000;
      a2=Ch0value*196%1000/100;

      b0=Ch1value*196/10000;
      b1=Ch1value*196%10000/1000;
      b2=Ch1value*196%1000/100;
      write_com(0x80+11);
      write_dat(0x30+a0);
      write_dat(.);
      write_dat(0x30+a1);
      write_dat(0x30+a2);
      write_dat(V);

      write_com(0x80+0x40+11);
      write_dat(0x30+b0);
      write_dat(.);
      write_dat(0x30+b1);
      write_dat(0x30+b2);
      write_dat(V);

      }
      void main()
      {
      init_1602();
      init();
      while(1)
      {
      Ch0value=read_adc(0);
      delayms(50);
      Ch1value=read_adc(1);
      delayms(50);
      display();
      }
      }


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