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Fix for negative values

This commit is contained in:
sza2 2015-02-14 10:48:41 +01:00
parent 7e524f7dd4
commit 5a629e4297
1 changed files with 8 additions and 3 deletions
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11
lua_modules/ds18b20/ds18b20.lua
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@ -3,6 +3,7 @@
-- NODEMCU TEAM
-- LICENCE: http://opensource.org/licenses/MIT
-- Vowstar <vowstar@nodemcu.com>
-- 2015/02/14 sza2 <sza2trash@gmail.com> Fix for negative values
--------------------------------------------------------------------------------
-- Set module name as parameter of require
@ -96,12 +97,16 @@ function readNumber(addr, unit)
crc = ow.crc8(string.sub(data,1,8))
-- print("CRC="..crc)
if (crc == data:byte(9)) then
t = (data:byte(1) + data:byte(2) * 256)
if (t > 32767) then
t = -(65536 - t)
end
if(unit == nil or unit == C) then
t = (data:byte(1) + data:byte(2) * 256) * 625
t = t * 625
elseif(unit == F) then
t = (data:byte(1) + data:byte(2) * 256) * 1125 + 320000
t = t * 1125 + 320000
elseif(unit == K) then
t = (data:byte(1) + data:byte(2) * 256) * 625 + 2731500
t = t * 625 + 2731500
else
return nil
end