Чтение температуры с датчика LM75B на STM32 с помощью HAL. Предполагается, что I²C уже сконфигурирован.

#include "stm32f7xx_hal.h"
#include "i2c.h"
#define LM75_ADDR 0x90 // 7-bit address of LM75: left align to MSbit

#define LM75_TEMP 0x00 // Temperature Register of LM75
#define LM75_CONF 0x01 // Configuration Register of LM75
#define LM75_HYST 0x02 // 
#define LM75_TOS 0x03 // Over-temp Shutdown threshold Register of LM75
#define LM75_DevID 0x07 // Product ID Register

#define LM75_TEMP_CORR (float)(0.5) //LM75

typedef union {
 uint8_t Bytes[2];
 int16_t Word;
 }
 _TwoBytesS;

float GetTempLM75(void){
 _TwoBytesS Result; 
 float RetRes;
 uint8_t LM75Data[2]; 
 HAL_I2C_Mem_Read(&hi2c2,(uint16_t)LM75_ADDR, (uint16_t)LM75_TEMP, I2C_MEMADD_SIZE_8BIT, LM75Data, 2, 10);
 Result.Bytes[1] = LM75Data[0];
 Result.Bytes[0] = LM75Data[1];
 Result.Word /= 128;
 
 RetRes = (float)(Result.Word)* LM75_TEMP_CORR;
return RetRes; 
}