Adapt MELABS DS18B20 example to show negative temperatures?

[richard]

What should be fixed there to display negative temperature properly?
As I've read DS18B20 datasheet, negative temperature output will always have 4 MSB bits set to 1111. But what's wrong with the above conversion formula?

you may have read the DS18B20 datasheet but you are using code for a DS18S20 so the first step is work out what you really have and then use the correct method

[CuriousOne]

Well I have it running with DS18B20 and it displays positive temperatures just fine...

[CuriousOne]

I also used this:

https://melabs.com/samples/LABX1-16F...emp_DS1822.htm

But it is much slower.
And I don't need high precision, this is just room temperature thermometer, 1C precision is ok.