单片机实验PCF8591模数转换

ID:1106874 · 发表于 2023-12-28 17:11

#include <reg52.h>
#include "PCF8591.h"

bit flagls=1;
unsigned char T0RH=0;
unsigned char T0RL=0;
unsigned char channel=0;
unsigned char LedBuff[4]={0xff,0xff,0xff,0xff};
unsigned char code smgcode[]=
{0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};

sbit LSA=P1^5;
sbit LSB=P1^6;
sbit LSC=P1^7;
sbit KEY0=P3^2;

void ConfigTimer0(unsigned int ms);
void ValueToBuff(unsigned char val);
void Delayms (unsigned int xms);
void main(void)
{
      unsigned char val;
      EA=1;
      EX0=1;
      IT0=1;
      ConfigTimer0(2);

      while(1)
      {
            if(flagls)
            {
                     flagls=0;
                     val=GetADCValue(channel);
                     ValueToBuff(val);
                     channel%=2;
            }
      }
}

void ValueToBuff(unsigned char val)
{
      val=(val*250)/255;
      LedBuff[0]=smgcode[(val%10)];
      LedBuff[1]=smgcode[(val/10)%10];
      LedBuff[2]=smgcode[(val/100)];
      LedBuff[2]&=0x7f;
}

void ConfigTimer0(unsigned int ms)
{
      unsigned long tmp;

      tmp=11059200/12;
      tmp=(tmp*ms)/1000;
      tmp=65536-tmp;
      tmp=tmp+18;
      T0RH=(unsigned char)(tmp>>8);
      T0RL=(unsigned char)tmp;
      TMOD&=0xf0;
      TMOD|=0x01;
      TH0=T0RH;
      TL0=T0RL;
      ET0=1;
      TR0=1;
}

void LedScan(void)
{
      static unsigned char i=0;

      P0=0xff;
      switch(i)
      {
            case 0:
            LSA=1;
            LSB=0;
            LSC=0;
            i++;
            P0=LedBuff[0];
            Delayms(2);
            break;


            case 1:
            LSA=0;
            LSB=1;
            LSC=0;
            i++;
            P0=LedBuff[1];
            Delayms(2);
            break;


            case 2:
            LSA=1;
            LSB=1;
            LSC=0;
            i++;
            P0=LedBuff[2];
            Delayms(2);
            break;


            case 3:
            LSA=0;
            LSB=0;
            LSC=1;
            i=0;
            P0=LedBuff[3];
            Delayms(2);
            break;
            default:
            break;
      }
}

void InterruptTimer0(void) interrupt 1
{
      static unsigned int tmrls=0;

      TH0=T0RH;
      TL0=T0RL;
      tmrls++;
      if(tmrls>=5)
      {
            tmrls=0;
            flagls=1;
      }
      LedScan();
}

void EXINT0(void) interrupt 0
{
      Delayms(2);
      channel=~channel;
}

void Delayms (unsigned int xms)
{
      unsigned int i,j;

      for(i=xms;i>0;i--)
      {
            for(j=106;j>0;j--);
      }
}

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