DS18B20T:(SP$)

REM Convert DS18B20 Scratch pad to temperature

REM Byte 4 of the scratch pad memory contains the configuration register

REM (c) Copyright 2024 nofitnessforpurpose All Rights Reserved

REM Revision : 0.1

REM Modified : NotFitForPurpose

REM Date : 30 Nov 2024

REM +----+----+----+----+----+----+----+----+

REM : B0 : B1 : B2 : B3 : B4 : B5 : B6 : B7 :

REM +---------------------------------------+

REM B0 = Temperature LSB

REM B1 = Temperature MSB

REM B2 = th Register

REM B3 = tl Register

REM B4 = Configuration Register

REM B5 = Reserved ($FF)

REM B6 = Reserved

REM B7 = Reserved ($10)

REM B8 = CRC

LOCAL b% : REM Scaling setting

LOCAL l, m : REM LSB - MSB

LOCAL t : REM Calculated temperature

REM Verify checksum

m = FLT(ASC(MID$(SP$, 2, 1))) * 256

l = ASC(MID$(SP$, 1, 1))

t = m + l

REM Get resolution from B4 of the Scratch Pad B4 bits 5 and 6

b% = ASC(MID$(SP$, 5, 1)) AND 96

REM Scale the raw values to temperature in Deg. C

IF b% = 96

t = t * 0.0625 : REM 12 Bit

ELSEIF b% = 64

t = t * 0.125 : REM 11 Bit

ELSEIF b% = 32

t = t * 0.250 : REM 10 Bit

ELSEIF b% = 0

t = t * 0.500 : REM 9 Bit

ENDIF

RETURN t