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Author SHA1 Message Date
Nick Andrew 0a7b730e23 Support DS18S20 and fix negative temp handling 
The DS18S20 has only 1 fractional bit whereas DS18B20 has 4, and their
temperature register alignment differs. Check the family code to choose
the correct multiplier for both devices.

Closes #610

Negative temperatures (less than 0°C) are returned as a sign-extended
two's complement number. Subtract 0x10000 to recover the proper
negative value.

Signed-off-by: Nick Andrew <nick@nick-andrew.net>
 2015-11-16 23:32:20 +11:00
funshine 152107feab rename folder name to pre_build 2014-12-22 20:28:37 +08:00