我用STM32F107 SPI方式采集ADC128S022的问题，采到的数据不对，我结合官网提供的M430的例子，没用过M430，

阳光&守望者 · 发表于 2015-4-24 10:39:28

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

阳光&守望者 · 发表于 2015-4-24 10:41:12

这是我的SPI的配置

void SPI_Configuration(void)
{
   SPI_InitTypeDef SPI_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
   SystemInit();
    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA
                |RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO
                |RCC_APB2Periph_SPI1, ENABLE );

/* Configure USART1 Rx (PB.8) as input floating busy busy DRDY */
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure SPI1 pins: SCK, MISO and MOSI */
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //???????ì????
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOA, &GPIO_InitStructure);

        /* Configure I/O for Flash Chip select */
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //SPI CS
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //???????ì????
     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOC, &GPIO_InitStructure);

        /* Deselect the FLASH: Chip Select high */
        GPIO_SetBits(GPIOC,GPIO_Pin_5);
        GPIO_SetBits(GPIOC,GPIO_Pin_4);

     SPI_Cmd(SPI1, DISABLE); //??????SPI???è ×???????

/* SPI1 configuration */
        SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //?è??SPI???ò?ò?????ò??????????:SPI?è???????????ò?????¤
        SPI_InitStructure.SPI_Mode = SPI_Mode_Master;                //?è??SPI?¤×÷????:?è?????÷SPI
        SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;                //?è??SPI???????ó??:SPI·???????8?????á??
        SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;                //???????®???±????????:?±???ü????
        SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;        //?????????????????±????
        SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;                //NSS???????????¨NSS?????©?????í???¨????SSI???©???í:????NSS??????SSI??????
        SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;                //?¨???¨?????¤·???????:?¨?????¤·???????256
        SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;        //???¨??????????MSB??????LSB??????:??????????MSB??????
        SPI_InitStructure.SPI_CRCPolynomial = 7;            //CRC?????????à????
        SPI_Init(SPI1, &SPI_InitStructure);             //?ù??SPI_InitStruct?????¨???????????????èSPIx?????÷

        //SPI1->CR1|=1<<6; //SPI?è±?????
        /* Enable SPI1 */
        SPI_Cmd(SPI1, ENABLE); //????SPI???è

        SPI_ReadWriteByte(0xff);//????????
}