LPS25HBTR pressure reading decreasing over time

[2067]

I have bought a MKI-165V1 to test LPS25HBTR,but I find that the pressure value is decreasing for a long time ,from 1014.117 to 1002.970 in an hour.It is not stable,the next is my initial code,what is the reason for it

uint8_t data = 0x90;

HAL_I2C_Mem_Write(&hi2c4, 0xB8, 0x20 , I2C_MEMADD_SIZE_8BIT, &data, 1, HAL_MAX_DELAY);

HAL_Delay(10);

data = 0x00;

HAL_I2C_Mem_Write(&hi2c4, 0xB8, 0x21 , I2C_MEMADD_SIZE_8BIT, &data, 1, HAL_MAX_DELAY);

// HAL_Delay(10);

// HAL_I2C_Mem_Write(&hi2c4, 0xB8, 0x22 , I2C_MEMADD_SIZE_8BIT, pData, Size, 0xFF);

HAL_Delay(10);

HAL_I2C_Mem_Write(&hi2c4, 0xB8, 0x23 , I2C_MEMADD_SIZE_8BIT, &data, 1, HAL_MAX_DELAY);

HAL_Delay(10);

[2067]

Here is the code I wrote in Keil for configuring and reading data from the LPS25. Please tell me if this code could cause the values to decrease.

void LPS25_Init(void)

{

uint8_t data;

data = 0x05;

HAL_I2C_Mem_Write(&hi2c4, 0xB8, 0x10 , I2C_MEMADD_SIZE_8BIT, &data, 1, HAL_MAX_DELAY);

HAL_Delay(10);

data = 0xC1;

HAL_I2C_Mem_Write(&hi2c4, 0xB8, 0x2E , I2C_MEMADD_SIZE_8BIT, &data, 1, HAL_MAX_DELAY);

HAL_Delay(10);

data = 0x40;

HAL_I2C_Mem_Write(&hi2c4, 0xB8, 0x21 , I2C_MEMADD_SIZE_8BIT, &data, 1, HAL_MAX_DELAY);

// HAL_Delay(10);

// HAL_I2C_Mem_Write(&hi2c4, 0xB8, 0x22 , I2C_MEMADD_SIZE_8BIT, pData, Size, 0xFF);

HAL_Delay(10);

// data = 0x00;

// HAL_I2C_Mem_Write(&hi2c4, 0xB8, 0x23 , I2C_MEMADD_SIZE_8BIT, &data, 1, HAL_MAX_DELAY);

// HAL_Delay(10);

data = 0x94;

HAL_I2C_Mem_Write(&hi2c4, 0xB8, 0x20 , I2C_MEMADD_SIZE_8BIT, &data, 1, HAL_MAX_DELAY);//注意用哪个IIC

HAL_Delay(10);

}

float LPS25_getdata(void)

{

uint8_t qiya_buff[3];

uint32_t qiya_data;

float qiya;

HAL_I2C_Mem_Read(&hi2c4, 0xB9, 0x28 , I2C_MEMADD_SIZE_8BIT, &qiya_buff[0], 1, HAL_MAX_DELAY);

HAL_I2C_Mem_Read(&hi2c4, 0xB9, 0x29 , I2C_MEMADD_SIZE_8BIT, &qiya_buff[1], 1, HAL_MAX_DELAY);

HAL_I2C_Mem_Read(&hi2c4, 0xB9, 0x2A , I2C_MEMADD_SIZE_8BIT, &qiya_buff[2], 1, HAL_MAX_DELAY);

qiya_data = (uint32_t)(qiya_buff[2] << 16) | (uint32_t)(qiya_buff[1] << 8) | (uint32_t)qiya_buff[0];

qiya = (float)qiya_data/4096.0f;

return qiya;

}