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Usermod Temperature: use full 12-bit precision #4916

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Usermod Temperature: use full 12-bit precision #4916

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fcc4632
Usermod Temperature: use full 12-bit precision
nename0 Sep 7, 2025
3017145
Temperature Usermod: fix DS1822 and DS18B20 family code
nename0 Sep 7, 2025
9056e5f
Add Dropdown to select 9 or 12 bit resolution
nename0 Sep 13, 2025
020fde9
Add 10 and 11 bit resolution, Correct rounding towards negativ inf
nename0 Sep 13, 2025
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8 changes: 4 additions & 4 deletions usermods/Temperature/Temperature.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -20,17 +20,17 @@ float UsermodTemperature::readDallas() {
}
#endif
switch(sensorFound) {
case 0x10: // DS18S20 has 9-bit precision
case 0x10: // DS18S20 has 9-bit precision - 1-bit fraction part
result = (data[1] << 8) | data[0];
retVal = float(result) * 0.5f;
break;
case 0x22: // DS18B20
case 0x28: // DS1822
case 0x3B: // DS1825
case 0x42: // DS28EA00
result = (data[1]<<4) | (data[0]>>4); // we only need whole part, we will add fraction when returning
if (data[1] & 0x80) result |= 0xF000; // fix negative value
retVal = float(result) + ((data[0] & 0x08) ? 0.5f : 0.0f);
// 12-bit precision - 4-bit fraction part
result = (data[1] << 8) | data[0];
retVal = float(result) * 0.0625f; // 2^(-4)
break;
}
}
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