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stm32f4 discovery lis3dsh communication problem

Question asked by porkhun.artem on Nov 10, 2014

Hi!

I have stm32f4 discovery board MB997C.
I`m trying to communicate with LIS3DSH accelerometer. I have a problem - MISO line (port PA6) is always high.
I`m just trying to get the value of WHO_AM_I register and as response I always get 0xFF. Here is my configuration code:
 
#define CS_HIGH GPIO_SetBits(GPIOE, GPIO_Pin_3)
#define CS_LOW  GPIO_ResetBits(GPIOE, GPIO_Pin_3)

GPIO_InitTypeDef GPIOA_InitStructure;
GPIO_InitTypeDef GPIOE_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
SPI_InitTypeDef  SPI_InitStructure;

uint8_t receivedByte;
unsigned int TransactionFlag = 0x0000;
unsigned int TransmitCounter = 0x0000;

void main(void)
{
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
 
 
  GPIOA_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
  GPIOA_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIOA_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIOA_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIOA_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
 
  GPIO_Init(GPIOA, &GPIOA_InitStructure);
 
 
  GPIO_PinAFConfig(GPIOA,GPIO_PinSource5,GPIO_AF_SPI1);
  GPIO_PinAFConfig(GPIOA,GPIO_PinSource6,GPIO_AF_SPI1);
  GPIO_PinAFConfig(GPIOA,GPIO_PinSource7,GPIO_AF_SPI1);
 
  GPIOE_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIOE_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIOE_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIOE_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIOE_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
  GPIO_Init(GPIOE, &GPIOE_InitStructure);
 
  CS_HIGH;
 
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft | SPI_NSSInternalSoft_Set;
  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
  SPI_Init(SPI1, &SPI_InitStructure);
 
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
  NVIC_InitStructure.NVIC_IRQChannel = SPI1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
 
  SPI_Cmd(SPI1, ENABLE);
//  SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_RXNE, ENABLE);
//  SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_TXE, ENABLE);
 
  while(1)
  {
      unsigned long i;

      CS_LOW;
      for(i = 0; i < 10; i++);
     
      SPI_I2S_SendData(SPI1, 0x8F);
      //Wait for transmission to complete
      while (!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE));
      //Wait for received data to complete
      while (!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE));
      //Wait for SPI to be ready
//      while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY));
     
      receivedByte = SPI_I2S_ReceiveData(SPI1);
     
      SPI_I2S_SendData(SPI1, 0x00);
      //Wait for transmission to complete
      while (!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE));
      //Wait for received data to complete
      while (!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE));
     
      receivedByte = SPI_I2S_ReceiveData(SPI1);
     
      //Wait for transmission to complete
//      while (!SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE));
      //Wait for SPI to be ready
//      while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY));
     
      for(i = 0; i < 10; i++);
      CS_HIGH;

      for(i = 0; i < 100; i++);
  }
}
 

Help me please, what am i doing wrong?

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