一般情况下AD采集不到数据怎么回事啊

2万 · 2016-6-9 16:47

一般情况下AD采集不到数据怎么回事啊

2万 · 2016-6-9 16:48

具体看情况啊，你得程序呢

2万 · 2016-6-9 16:50

#include <SH79F6488.H>
#include"periphral.h"
ulong data ADC_Data;

unsigned long data ADCData;
uchar data Temp;
unsigned long data ADvalue;
void ad_init(void)
{
         REGCON=0x01;       //2.7V
      //ADCON=0x80;             //AN2-AIN0 基准电压vref1,和VDDR同源
      //ADCON=0xa0;             //AN2-AIN0 基准电压vref2=1.19       ，和VDDR不同源
      ADCON=0xC4;             //AN0单端输入，VREF=2.7
      //ADCON=0x85;             //AN1单端输入，VREF=2.7
      //ADCON=0x86;             //AN2单端输入，VREF=2.7
      //ADCON=0x87;             //AN3单端输入，VREF=2.7
      //ADCON=0x80;             //差分输入AIN0+和AIN0-
      //ADCON=0x87;             //差分输入AIN1+和AIN1-
      //ADCON=0x87;             //差分输入AIN2+和AIN2-



      //ADT=0xFC;             //ADC=XXXHz@12MHz
//ADT=0xFD;             //ADC=500Hz@12MHz
      //ADT=0xFB;             //ADC=300Hz@12MHz
      //ADT=0xF9;             //ADC=214Hz@12MHz
ADT=0xF1;             //ADC=100Hz@12MHz
      //ADT=0xE2;             //ADC=50Hz@12MHz
      //ADT=0xA0;             //ADC=10Hz@12MHz
      //ADCH=0x3F;       //VREF=0.15*VDDR,AIN0
      //ADCH=0x7F;       //VREF=0.22*VDDR,AIN0
      //ADCH=0xBF;       //VREF=0.3*VDDR,AIN0
      ADCH=0xFF;       //VREF=0.4*VDDR,AIN0
      //ADCDS=0x03;          //VINOS=1,ADCDF=1
      PGAM=0x04;          //PGA Gain=1,chop=1K
      //PGAM=0x14;          //PGA Gain=2,chop=1K
      //PGAM=0x24;          //PGA Gain=4,chop=1K
      //PGAM=0x64;          //PGA Gain=8,chop=1K
      //PGAM=0x84;          //PGA Gain=16,chop=1K
      //PGAM=0x94;       //PGA Gain=32,chop=1K
//PGAM=0xA4;       //PGA Gain=64,chop=1K
      //PGAM=0xE4;       //PGA Gain=128,chop=1K


}

unsigned long ScanADCData(void)
{

      while(1)
      {
            Temp=ADCON&0x40;
            if(Temp==0x40)break;
      }
      ADCON&=0xBF;

      ADCData=ADDH;
      ADCData=ADCData*256;
      ADCData=ADCData+ADDM;
      ADCData=ADCData*16;
      ADCData=ADCData+ADDL;

      return ADCData;
}

void main()
{

ad_init();
{
   ADvalue=ScanADCData();
}
}