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lm75: fix reading negative temperatures #710

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trombik merged 1 commit into from
Jul 24, 2025
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lm75: fix reading negative temperatures #710

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5 changes: 4 additions & 1 deletion components/lm75/lm75.c
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Original file line number Diff line number Diff line change
Expand Up @@ -94,7 +94,10 @@ esp_err_t lm75_read_temperature(i2c_dev_t *dev, float *value)
"lm75_read_temperature(): read_register16() failed: register: 0x%x", LM75_REG_TEMP);
I2C_DEV_GIVE_MUTEX(dev);

*value = (raw_data >> 5) * 0.125;
raw_data >>= 5;
/* for negative temperatures, decode the multiplier from 2's complement */
*value = (raw_data & 0x0400 ? -(~(raw_data-1) & 0x07ff) : raw_data) * 0.125;

return ESP_OK;
}

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