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RTC_DS3231: correctly handle negative temperatures #303

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RTC_DS3231: correctly handle negative temperatures #303

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3 changes: 2 additions & 1 deletion src/RTC_DS3231.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -114,7 +114,8 @@ void RTC_DS3231::writeSqwPinMode(Ds3231SqwPinMode mode) {
float RTC_DS3231::getTemperature() {
uint8_t buffer[2] = {DS3231_TEMPERATUREREG, 0};
i2c_dev->write_then_read(buffer, 1, buffer, 2);
return (float)buffer[0] + (buffer[1] >> 6) * 0.25f;
int16_t temp = uint16_t(buffer[0]) << 8 | buffer[1];
return temp * (1 / 256.0);
}

/**************************************************************************/
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