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Update LM75A.cpp #1

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d8802cd
Update LM75A.cpp
andrzejboro Jan 14, 2018
a13ef6c
Update LM75A.cpp
andrzejboro Jan 14, 2018
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19 changes: 10 additions & 9 deletions LM75A/LM75A.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -89,7 +89,7 @@ float LM75A::getTemperatureInDegrees() const
}

// Modify the value (only 11 MSB are relevant if swapped)
uint16_t refactored_value;
int16_t refactored_value;
uint8_t* ptr = (uint8_t*)&refactored_value;

// Swap bytes
Expand All @@ -98,15 +98,16 @@ float LM75A::getTemperatureInDegrees() const

// Shift data (left-aligned)
refactored_value >>= 5;

// Relocate negative bit (11th bit to 16th bit)
float real_value;
if (refactored_value & 0x0400) {
refactored_value &= 0x03FF;
refactored_value |= 0x8000;
// When sign bit is set, set upper unused bits, then 2's complement
refactored_value |= 0xf800;
refactored_value = ~refactored_value + 1;
real_value = (float)refactored_value * (-1) * LM75A_DEGREES_RESOLUTION;
}
else
real_value = (float)refactored_value * LM75A_DEGREES_RESOLUTION;

// Real value can be calculated with sensor resolution
real_result = (float)refactored_value * LM75A_DEGREES_RESOLUTION;

return (float)refactored_value * LM75A_DEGREES_RESOLUTION;
return real_value;
}