我用STM32F107 SPI方式采集ADC128S022的问题，采到的数据不对

只看该作者 · 2015-4-24 10:48

extern void Delay(vu32 nCount);
#define NUM_OF_RESULTS 8 // Number of temp sensor samples to take
#define ADC_CHANNEL    0 // ADC channel for conversion
#define SCALE_FACTOR    3 // For averaging converted samples
#define ADC12_RATIO 0.805664 // 3300/4096(3300mV ref & 12bit converter, straight binary o/p)
#define ADC_INPUT0       0
#define ADC_INPUT1       1
#define ADC_INPUT2       2
#define ADC_INPUT3       3
#define ADC_INPUT4       4
#define ADC_INPUT5       5
#define ADC_INPUT6       6
#define ADC_INPUT7       7
volatile unsigned char bdata;
unsigned char ADC_Input  = 0x00;
unsigned char ADC_Cnt  = 0x00;
unsigned short ADC_Data  = 0x0000;
unsigned char ADC_Numbytes = 0x00;
unsigned char i ; void TI_ADC128S022_Init(void)
{
ADC_Numbytes = 16;
ADC_Data  = 0;
AD_CS_DISABLE();
   AD_SCLK_DISABLE();
Delay(1000);
   AD_CS_ENABLE();
#if 0
   switch(NUM_OF_RESULTS)
{
   case 0:ADC_Input = ADC_INPUT0; break;
   case 1:ADC_Input = ADC_INPUT1; break;
   case 2:ADC_Input = ADC_INPUT2; break;
   case 3:ADC_Input = ADC_INPUT3; break;
   case 4:ADC_Input = ADC_INPUT4; break;
   case 5:ADC_Input = ADC_INPUT5; break;
   case 6:ADC_Input = ADC_INPUT6; break;
   case 7:ADC_Input = ADC_INPUT7; break;
default:
break;
}
#endif
ADC_Input = 0xe1;
for(ADC_Cnt = 0; ADC_Cnt < ADC_Numbytes; ADC_Cnt++)
   {
   Delay(1000);
   AD_SCLK_DISABLE();
   if (ADC_Cnt<5)
{
   if(ADC_Input&0x80)
   {
   ADC_DOU_ENABLE();
   }
   else
   {
      ADC_DOU_DISABLE();
         }
   ADC_Input <<= 1;
}
   else
   {
      ADC_DOU_DISABLE();
         }
   Delay(1000);
   AD_SCLK_ENABLE();
   Delay(1000);
         // if(ADC_Cnt >= 4 )
   // {
   //  ADC_Data <<= 1;

   //if(ADC_DIN_ENABLE)
   // {
   // ADC_Data |= 0x0001;
         // }
   // else
   // {
      // ADC_Data &= 0xfffe;
         //  }
  }
// else
// {;}
//}
   AD_CS_DISABLE();
   //AD_SCLK_ENABLE();
   // *adc_data = ADC_Data;
   // return;
   // printf("%d ",ADC_Data);    //这儿打印出来的值是4095
}
void TI_ADC128S022_ADC_vout (void)
{
  uint8_t i;
static uint16_t results[NUM_OF_RESULTS];    // To store ADC output
static uint32_t sum_adc_data = 0;             // accumulate and avg adc results
volatile static float vout;                   // ADC vout

for(i=0; i<8;i++)
{
   results = SPI_ReadWriteByte(ADC_CHANNEL); // read and store ADC Channel output
   sum_adc_data += results;                // accumulate result
   Delay(1000);                               // acquisition time
}
sum_adc_data >>= SCALE_FACTOR;                // Average the accumulated sum
vout = sum_adc_data * ADC12_RATIO;          // ADC vout
sum_adc_data = 0;                            // Set Breakpoint here & see measured vout
while(1)
{
printf("%f ",vout);    //这儿打印值是205.444321
Delay(5000000);
}
}

int main(void)
{
  Init_Usart();
SPI_Configuration();
  TI_ADC128S022_Init();
  TI_ADC128S022_ADC_vout();
}
问题出在哪了，这是我的程序