PIC单片机ADC模块的问题

只看该作者 · 2015-7-17 13:59

#include<pic.h>
#define uint unsigned int
#define uchar unsigned char
__CONFIG(0x3B31);
const uchar table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};//1,2,3,4,5,6,7,8,9共阳极数码管
const uchar table1[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};//带小数点数字
void delay(uint x)
{
      uint a,b;
      for(a=x;a>0;a--)
      for(b=110;b>0;b--);
}
void chushihua()
{
      uchar i;
      TRISA=0X01;
      PORTA=0;
      TRISB=0;
      TRISC=0;
      PORTB=0;
      PORTC=0xff;
      ADCON0=0X85;
      ADRESH=0;
      ADRESL=0;
      ADCON1=0X10;
      NOP();NOP();
      for (i=0;i<3;i++);
      NOP();NOP();
}
uint getad()
{
      uint adval,aa;
      float advalf;
      GO=1;//启动转换
      while(GO);
      adval=ADRESH;
      adval=adval<<8|ADRESL;
      advalf=adval/1023*5000;
      aa=(int)advalf;
      return(aa);
}
void xianshi(uchar num1,uchar num2,uchar num3,uchar num4)
{
      PORTC=table[num1];
      PORTB=0x10;
      delay(2);
      PORTC=table[num2];
      PORTB=0x20;
      delay(2);
      PORTC=table1[num3];
      PORTB=0x40;
      delay(2);
      PORTC=table[num4];
      PORTB=0x80;
      delay(2);
}
void main()
{
      uint lednum;
      uchar a1,a2,a3,a4;
      chushihua();
      while(1)
      {
            lednum=getad();
            a1=lednum/1000;
            a2=lednum%1000/100;
            a3=lednum%100/10;
            a4=lednum%10;
            xianshi(a1,a2,a3,a4);
      }
}
有谁知道这段代码写进芯片16F690之后，使用AN1端口只是在测试5V的时候有显示数字500，小于5V没有显示是什么原因

只看该作者 · 2015-7-17 14:03

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