How can I read data from an I2C temperature sensor (TMP102) using an STM32 microcontroller?

Good day guys, how can I read data from an I2C temperature sensor (TMP102) using an STM32 microcontroller? I am encountering the error

Failed to read from the I2C bus: Remote I/O error

Failed to read from the I2C bus: Remote I/O error

despite confirming that the sensor is powered and the I2C connections are correctly set up. Here is my current code snippet, which attempts to read 10 bytes of data from the sensor:

char buffer[10];
if (read(file, buffer, 10) != 10) {
    perror("Failed to read from the I2C bus");
}

char buffer[10];
if (read(file, buffer, 10) != 10) {
    perror("Failed to read from the I2C bus");
}

@Middleware & OS @Helper

Solution

Try this code instead

#include "stm32f1xx_hal.h"

I2C_HandleTypeDef hi2c1;

#define TMP102_ADDR (0x48 << 1) // TMP102 default address (0x48) shifted for HAL functions
#define TEMP_REG 0x00 // Temperature register address

uint8_t buffer[2];

void TMP102_Init(void) {
hi2c1.Instance = I2C1;
hi2c1.Init.ClockSpeed = 100000;
hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
hi2c1.Init.OwnAddress1 = 0;
hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;

if (HAL_I2C_Init(&hi2c1) != HAL_OK) {
Error_Handler();
}
}

float TMP102_ReadTemperature(void) {
uint8_t reg = TEMP_REG;
float temperature = 0.0;

if (HAL_I2C_Master_Transmit(&hi2c1, TMP102_ADDR, &reg, 1, HAL_MAX_DELAY) != HAL_OK) {
Error_Handler();
}

if (HAL_I2C_Master_Receive(&hi2c1, TMP102_ADDR, buffer, 2, HAL_MAX_DELAY) != HAL_OK) {
Error_Handler();
}

int16_t rawTemp = (buffer[0] << 8) | buffer[1];
rawTemp >>= 4;
temperature = rawTemp * 0.0625;

return temperature;
}

void Error_Handler(void) {
while(1);
}

int main(void) {
HAL_Init();
TMP102_Init();

while (1) {
float temperature = TMP102_ReadTemperature();
HAL_Delay(1000);
}
}

Jump to solution

Solution

aymen ammariAPP•7/2/24, 3:21 PM

Boss ladyAPP•7/2/24, 3:22 PM

It worked @aymen ammari , can u tell me what I was doing wrong, just in case of next time

ZacckOsiemoAPP•7/2/24, 3:23 PM

How did you even know she was on an f1

BBoss lady It worked @aymen ammari , can u tell me what I was doing wrong, just in case of ...

aymen ammari•7/2/24, 3:23 PM

It's one of these

I2C Address: Ensure it’s left-shifted by 1.
Initialization: Proper I2C initialization is crucial.
Communication Sequence: Write to the pointer register before reading data.