stm32f4 discovery lis3dsh communication

[wersalec]

Posted on November 09, 2014 at 23:41

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?

[Konstantin Maslennikov]

Posted on February 23, 2018 at 18:10

Can you run just blink on PA6?

[Konstantin Maslennikov]

Posted on February 23, 2018 at 18:21

My code with StdPeriph:

#include 'stm32f4xx.h'

#include 'main.h'

#include 'spi.h'

#define LIS3DSH

#define LIS3DSH_OUT_X_L 0x28

#define LIS3DSH_OUT_X_H 0x29

#define LIS3DSH_OUT_Y_L 0x2a

#define LIS3DSH_OUT_Y_H 0x2b

#define LIS3DSH_OUT_Z_L 0x2c

#define LIS3DSH_OUT_Z_D 0x2c

#define HYSTERESIS 6000

int16_t AxisX = 0;

int16_t AxisY = 0;

//int16_t AxisZ = 0;

uint8_t temp_x_l = 0;

uint8_t temp_x_h = 0;

uint8_t temp_y_l = 0;

uint8_t temp_y_h = 0;

uint8_t writeData(uint8_t data)

{

while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET) ;

SPI_I2S_SendData(SPI1, data);

while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET) ;

return SPI_I2S_ReceiveData(SPI1);

}

int getReg(uint8_t address)

{

uint8_t data=0;

address|=(1<<7);

GPIO_ResetBits(GPIOE,GPIO_Pin_3);

writeData(address);

data = writeData(0x00);

GPIO_SetBits(GPIOE,GPIO_Pin_3);

return data;

}

void setReg(uint8_t address, uint8_t value)

{

GPIO_ResetBits(GPIOE,GPIO_Pin_3);

writeData(address);

writeData(value);

GPIO_SetBits(GPIOE,GPIO_Pin_3);

}

int main(void)

{

Led_init();

SPI_init();

// getReg(0x0f); // get ID

setReg(0x20, 0x97);

setReg(0x23, 0xA0);

while(1)

{

temp_x_h = getReg(LIS3DSH_OUT_X_H);

temp_x_l = getReg(LIS3DSH_OUT_X_L);

temp_y_h = getReg(LIS3DSH_OUT_Y_H);

temp_y_l = getReg(LIS3DSH_OUT_Y_L);

AxisX = (temp_x_h) << 8 | temp_x_l;

AxisY = (temp_y_h) << 8 | temp_y_l;

if (AxisX > HYSTERESIS)

{ R_ON(); }

else if (AxisX < -HYSTERESIS)

{ G_ON(); }

else

{ R_OFF();

G_OFF(); }

if (AxisY > HYSTERESIS)

{ Y_ON(); }

else if (AxisY < -HYSTERESIS)

{ B_ON(); }

else

{ B_OFF();

Y_OFF(); }

}

}

[AvaTar]

Posted on February 23, 2018 at 18:24

I would try the MEMS example from the F4 disco firmware package.

I used to start my project with working examples, and added my code then later.

And the example would be a good functional test.