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i am working on stm32l412kb with LIS3DH accelerometer sensor using stm32cubeide .

Kai_Satone
Associate II

i am using i2c1 and uart2 to show any values i have created program but i am not getting any values from accelerometer. can you tell me any one, solution of this problem

WhatsApp Image 2024-02-23 at 15.14.54_18bf3525.jpg

I2C_HandleTypeDef hi2c1;

 

UART_HandleTypeDef huart2;

 

/* USER CODE BEGIN PV */

#define LIS3DH_ADDR 0x19// I2C address of LIS3DH accelerometer

 

 

/* USER CODE END PV */

 

 

/* Private function prototypes -----------------------------------------------*/

void SystemClock_Config(void);

static void MX_GPIO_Init(void);

static void MX_I2C1_Init(void);

static void MX_USART2_UART_Init(void);

/* USER CODE BEGIN PFP */

 

/* USER CODE END PFP */

 

/* Private user code ---------------------------------------------------------*/

/* USER CODE BEGIN 0 */

 

void accelerometer_read_data(uint8_t reg, uint8_t* data, uint16_t size) {

 

 

 

HAL_I2C_Master_Transmit(&hi2c1, LIS3DH_ADDR, &reg, 1, HAL_MAX_DELAY);

HAL_I2C_Master_Receive(&hi2c1, LIS3DH_ADDR, data, size, HAL_MAX_DELAY);

}

 

/* USER CODE END 0 */

 

/**

* @brief The application entry point.

* @retval int

*/

int main(void)

{

/* USER CODE BEGIN 1 */

 

/* USER CODE END 1 */

 

/* MCU Configuration--------------------------------------------------------*/

 

/* Reset of all peripherals, Initializes the Flash interface and the Systick. */

HAL_Init();

 

/* USER CODE BEGIN Init */

 

/* USER CODE END Init */

 

/* Configure the system clock */

SystemClock_Config();

 

/* USER CODE BEGIN SysInit */

 

/* USER CODE END SysInit */

 

/* Initialize all configured peripherals */

MX_GPIO_Init();

MX_I2C1_Init();

MX_USART2_UART_Init();

/* USER CODE BEGIN 2 */

uint8_t data[6];

int16_t x, y, z;

float x_g, y_g, z_g;

char buffer[50];

char buffer1[50];

// /* U

while (1) {

// Read accelerometer data registers

accelerometer_read_data(0x28 | 0x80, data, 6); // Read from OUT_X_L, 0x28 with MSB set

 

// Extract accelerometer data

x = (int16_t)((data[1] << 8) | data[0]);

y = (int16_t)((data[3] << 8) | data[2]);

z = (int16_t)((data[5] << 8) | data[4]);

 

 

 

// Convert raw data to gravitational force (g)

x_g = (float)x / 16384.0; // 16384 LSB/g for +/- 2g range

y_g = (float)y / 16384.0;

z_g = (float)z / 16384.0;

 

// Print accelerometer data to serial console

sprintf(buffer, "X: %.2f g, Y: %.2f g, Z: %.2f g\r\n", x_g, y_g, z_g);

HAL_UART_Transmit(&huart2, (uint8_t*)buffer, strlen(buffer), HAL_MAX_DELAY);

 

HAL_Delay(1000); // Delay for 1 second

}

/* USER CODE END 3 */

}

Kai_Satone_0-1708681625680.png

 

4 REPLIES 4
Federica Bossi
ST Employee

Hi @Kai_Satone ,

Could you try to use our official PID examples and let me know if you get some results?

Thanks

In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.
Andrew Neil
Evangelist III

Please use this button to properly post source code:

AndrewNeil_0-1708962727914.png

 

 

Andrew Neil
Evangelist III

@Kai_Satone wrote:

 

// Print accelerometer data to serial console

sprintf(buffer, "X: %.2f g, Y: %.2f g, Z: %.2f g\r\n", x_g, y_g, z_g);


Have you enabled support for floats in sprintf() et al ?

What happens if you just print the raw data bytes ?

I think yes, if floats are unable, this might trigger a warning at compilation.

Why do you use this syntax for the first params of accelerometer_read_data : 0x28 | 0x80?