stm32f4 discovery lis3dsh communication problem

[wersalec]

Posted on November 10, 2014 at 00:19

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?