谁用过ads1256啊，现在调试出现问题，求助啊！

shouzhou · 发表于 2014-3-9 15:51:00

引脚连接：ADS_CLK      PB13
    ADS_DIN     PB15
    ADS_DOUT     PB14
    ADS_DRDY     PB8
    ADS_CS       PB5
    ADS_RESET    PB6

初始化有下面几个函数：
SPI有关的初始化

void SPI_ADS1256_Init(void)
{
  SPI_InitTypeDef SPI_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOB, ENABLE );//PORTB?±??????
  RCC_APB1PeriphClockCmd( RCC_APB1Periph_SPI2, ENABLE );//SPI2?±??????
  //PB13 SCK    PB15 MOSI
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
    //PB14 MISO
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
   //GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;   //?????????¤
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;         //?÷?ú????
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;        //8??????
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;         //SCLK?????±????????
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;         //SCLK????????????????
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;          //???ú???????????í??????????????GPIO???????ú
  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;   //APB2?ò??APB1×?????????1/2~1/256·???
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;       //??????????MSB??????
  SPI_InitStructure.SPI_CRCPolynomial = 7;          //CRC?????????à????
  SPI_Init(SPI2, &SPI_InitStructure);

/* Enable SPI1 */
SPI_Cmd(SPI2, ENABLE);
}
//其他几个引脚的初始化

void ADS1256_GPIO_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//CS reset ?????è??
//CS PB5
//RESET PB6
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin= GPIO_Pin_5 | GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode= GPIO_Mode_Out_PP; //--????????????
GPIO_InitStructure.GPIO_Speed= GPIO_Speed_10MHz; //--GPIO·×???????50MHz

GPIO_Init(GPIOB , &GPIO_InitStructure); //--????????????????GPIO?????÷??

// DRDY?????è?? PB8
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin= GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode= GPIO_Mode_IPU; //--????????????
GPIO_InitStructure.GPIO_Speed= GPIO_Speed_10MHz; //--GPIO·×???????50MHz
GPIO_Init(GPIOB , &GPIO_InitStructure); //--????????????????GPIO?????÷??

}

//芯片初始化

void ADS1256_Init(void)
{
ADS_CS_LOW();
ADS_RESET = 1;
ADS1256WREG(ADS1256_STATUS,0x00);               //
delay_us(10);
ADS1256WREG(ADS1256_MUX,0x08);                  //
delay_us(10);
ADS1256WREG(ADS1256_ADCON,0x00);                //
delay_us(10);
ADS1256WREG(ADS1256_DRATE,ADS1256_DRATE_2_5SPS); //
delay_us(10);
ADS1256WREG(ADS1256_IO,0x00);                   // IO
delay_us(10);
//ADS_CS_HIGH();
}