LIS3DH problem - STM32F429-EVAL

[arturdav87]

Posted on March 08, 2015 at 20:26

Hello,

I have a problem to get axes data-> all axes are 7 (in 2's complement). I cant find the mistake. is all process is well?/* SPI2 init function */void SPI2_Init (void){  GPIO_InitTypeDef GPIO_InitStruct;  SPI_InitTypeDef SPI_InitTypeDefStruct;  /* Peripheral clock enable */  __SPI2_CLK_ENABLE();  /**SPI2 GPIO Configuration   PB13     ------> SPI2_SCK   PC3     ------> SPI2_MOSI   PG7     ------> SPI2_NSS   PB14     ------> SPI2_MISO   */  GPIO_InitStruct.Pin = GPIO_PIN_13 | GPIO_PIN_14;  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;  GPIO_InitStruct.Pull = GPIO_NOPULL;  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;  GPIO_InitStruct.Alternate = GPIO_AF5_SPI2;  HAL_GPIO_Init (GPIOB, &GPIO_InitStruct);  GPIO_InitStruct.Pin = GPIO_PIN_3;  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;  GPIO_InitStruct.Pull = GPIO_NOPULL;  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;  GPIO_InitStruct.Alternate = GPIO_AF5_SPI2;  HAL_GPIO_Init (GPIOC, &GPIO_InitStruct);    /*Configure GPIO pin : PG7 - ACCL_CS */  GPIO_InitStruct.Pin = GPIO_PIN_7;  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;  GPIO_InitStruct.Pull = GPIO_PULLUP;  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;  HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);  SPI_InitTypeDefStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;  SPI_InitTypeDefStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;  SPI_InitTypeDefStruct.SPI_Mode = SPI_Mode_Master;  SPI_InitTypeDefStruct.SPI_DataSize = SPI_DataSize_8b;  SPI_InitTypeDefStruct.SPI_NSS = SPI_NSS_Soft;  SPI_InitTypeDefStruct.SPI_FirstBit = SPI_FirstBit_MSB;  SPI_InitTypeDefStruct.SPI_CPOL = SPI_CPOL_High; //clock phase is high when idle  SPI_InitTypeDefStruct.SPI_CPHA = SPI_CPHA_1Edge;//data write on falling (first) edge  SPI_InitTypeDefStruct.SPI_CRCPolynomial = 7;  SPI_Init (SPI2, &SPI_InitTypeDefStruct);  SPI_Cmd(SPI2,ENABLE);}void Init_Acclerometer(void){//Inizialize MEMS Sensor //set ODR (turn ON device) LIS3DH_SetODR(LIS3DH_ODR_100Hz); //set PowerMode LIS3DH_SetMode(LIS3DH_NORMAL); //set Fullscale LIS3DH_SetFullScale(LIS3DH_FULLSCALE_2); //set axis Enable LIS3DH_SetAxis(LIS3DH_X_ENABLE | LIS3DH_Y_ENABLE | LIS3DH_Z_ENABLE);}//Reg addresses are:  0x29-X, 0x2B-Y, 0X2D-Zu8_t SPI_Mems_Read_Reg(u8_t Reg ){  u8_t axis_data; HAL_GPIO_WritePin(GPIOG,GPIO_PIN_7,GPIO_PIN_RESET); //CS low        Reg = 0x80 | Reg; //first '1' bit is for read, while(!SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE));  //transmit buffer empty? SPI_I2S_SendData(SPI2, Reg); //send data while(!SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE)); //data received? axis_data=SPI_I2S_ReceiveData(SPI2); //Clear RXNE bit while(!SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE));  //transmit buffer empty? SPI_I2S_SendData(SPI2, 0x00); //Dummy byte to generate clock while(!SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE)); //data received? HAL_GPIO_WritePin(GPIOG,GPIO_PIN_7,GPIO_PIN_SET); //CS high axis_data=SPI_I2S_ReceiveData(SPI2); //return reveiced data return axis_data;}void SPI_Mems_Write_Reg(uint8_t adress, uint8_t data){        HAL_GPIO_WritePin(GPIOG,GPIO_PIN_7,GPIO_PIN_RESET);   //CS low while(!SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE));  //transmit buffer empty? SPI_I2S_SendData(SPI2, adress); while(!SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE)); //data received? SPI_I2S_ReceiveData(SPI2); while(!SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE));  //transmit buffer empty? SPI_I2S_SendData(SPI2, data); while(!SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE)); //data received? SPI_I2S_ReceiveData(SPI2); HAL_GPIO_WritePin(GPIOG,GPIO_PIN_7,GPIO_PIN_SET); //CS high} #lis3dh