AD转换的问题

winnie

全局变量

char ADC_temp[5];
char number[10]={0x30,0x31,0x32,0x33,0x34,
     0x35,0x36,0x37,0x38,0x39};


读模拟量的子程序

void ADC_read(void)
{
unsigned int adc_number;
double   adc_value;
unsigned int adc_value_temp;
int    i,k;

ADRESL=0x00;
ADRESH=0x00;
adc_number=0;
adc_value=0;

ADGO=1;        // start AD conversion
while(ADGO)continue;

adc_number=ADRESH*256+ADRESL;
adc_value=5/(double)adc_number;
adc_value_temp=(int)(adc_value*1000);

for(i=4;i>0;i--)     // get every number of the adc_value
{
  k=adc_value_temp % 10;
  ADC_temp=number[k];
  adc_value_temp=adc_value_temp/10;
}

ADC_temp[0]=ADC_temp[1];
ADC_temp[1]=0x2E;     // add a '.' in adc_value
  

}

winnie

找到原因
应该修改为

adc_value=(5*(double)adc_number_average)/1024;