Convert negative gas resistance readings to unsigned int32

Gadgetoid · Gadgetoid · commit 888d8b312a49 · 2017-12-01T14:08:40.000Z
diff --git a/library/bme680/__init__.py b/library/bme680/__init__.py
@@ -354,6 +354,9 @@ def _calc_gas_resistance(self, gas_res_adc, gas_range):
         var3 = ((lookupTable2[gas_range] * var1) >> 9)
         calc_gas_res = ((var3 + (var2 >> 1)) / var2)
 
+        if calc_gas_res < 0:
+            calc_gas_res = (1<<32) + calc_gas_res
+
         return calc_gas_res
 
     def _calc_heater_resistance(self, temperature):
