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Bug fix: signed differential sample values are ignored in ADS1015 (12 bi... #115

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Apr 1, 2015
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Bug fix: signed differential sample values are ignored in ADS1015 (12 bi... #115

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6 changes: 5 additions & 1 deletion Adafruit_ADS1x15/Adafruit_ADS1x15.py
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Original file line number Diff line number Diff line change
Expand Up @@ -289,7 +289,11 @@ def readADCDifferential(self, chP=0, chN=1, pga=6144, sps=250):
result = self.i2c.readList(self.__ADS1015_REG_POINTER_CONVERT, 2)
if (self.ic == self.__IC_ADS1015):
# Shift right 4 bits for the 12-bit ADS1015 and convert to mV
return ( ((result[0] << 8) | (result[1] & 0xFF)) >> 4 )*pga/2048.0
val = ((result[0] << 8) | (result[1] & 0xFF)) >> 4
# (Take signed values into account as well)
if val >> 11:
val = val - 0xfff
return val*pga/2048.0
else:
# Return a mV value for the ADS1115
# (Take signed values into account as well)
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