Reading temperature using multi DS18B20

[BertMan]

I am having some troubles understanding the read temperature portion of this code. Take the following exerpt from the code:
W1:
OWIN DQ,4,[busy] ' Check for still busy converting
IF busy = 0 THEN W1' Still busy?, then loop
owout dq,1,[$55,S[(L*8)+0],S[(L*8)+1],S[(L*8)+2],S[(L*8)+3],S[(L*8)+4],S[(L*8)+5],S[(L*8)+6],S[(L*8)+7],$BE]
OWIN dq, 2, [R_Temp.Lowbyte, R_Temp.Highbyte]' Read two bytes / end comms
HotOrCold:
IF Cold_Bit = Real_Cold THEN ' If Cold_Bit = 1, it's below "0" LcdDeg C
Sign = "-" ' Display - symbol for negative temp
Dummy = 625 * ~R_Temp+1' Multiply to load internal registers with 32-bit value
TempC = DIV32 10 ' Use Div32 value to calculate precise LcdDeg C
endif

if cold_bit = 0 then
Sign = "+"
Dummy = 625 * R_Temp ' Multiply to load internal registers with 32-bit value
TempC = DIV32 10 ' Use Div32 value to calculate precise LcdDeg C
TempC = (R_Temp & $0FF0) >> 4 ' Mask middle 8-bits, shift into lower byte
Float = ((R_Temp.Lowbyte & $0F) * 625) ' Lower 4-bits of result * 625
endif

1. Okay so, under HotOrCold:, about 10 lines down you are assigning TempC to DIV32 10. No problems there. Then you assign TempC to (R_Temp & $0FF0) >> 4. Does this not just overwrite the value of TempC that you just assigned?

2. Under HotOrCold: again. 3 lines down. What is the "~" for? Couldn't find any documentation on this from the picbasic help file. And what does the +1 do?

[Heckler]

I think I can answer your last question...

~ is Bitwise NOT... meaning to invert each bit

For the other question I can not help... I have yet to understand exactly what the DIV32 function does.

[BertMan]

Thanks! That clears that up. Do you know why the +1 on the end?

The DIV32 command allows you to divide the 32 bit number held in internal registers. But that's not really important here. More importantly, why do we assign TEMPC, then reassign it again on the next line of code without using it.

[mtroutt]

Thanks for posting your code. I was having difficulty with negative readings and converting to an integer. I saw what I was doing wrong, corrected my code and now I can read negative temperatures.
thanks,