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fix: Fix below 0 temperatures #8

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fix: Fix below 0 temperatures #8

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113 changes: 22 additions & 91 deletions src/SparkFun_GridEYE_Arduino_Library.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,17 @@ void GridEYE::setI2CAddress(uint8_t addr)
_deviceAddress = addr;
}

int16_t extend12to16(int16_t temperature) {
// temperature is reported as 12-bit twos complement
// extend sign bit to 16-bit twos complement
temperature &= 0x0fff;
temperature |= (temperature & (1 << 11))<<1;
temperature |= (temperature & (1 << 11))<<2;
temperature |= (temperature & (1 << 11))<<3;
temperature |= (temperature & (1 << 11))<<4;
return temperature;
}

/********************************************************
* Functions for retreiving the temperature of
* a single pixel.
Expand All @@ -65,15 +76,7 @@ float GridEYE::getPixelTemperature(unsigned char pixelAddr)
unsigned char pixelLowRegister = TEMPERATURE_REGISTER_START + (2 * pixelAddr);
int16_t temperature = getRegister(pixelLowRegister, 2);

// temperature is reported as 12-bit twos complement
// check if temperature is negative
if(temperature & (1 << 11))
{
// if temperature is negative, mask out the sign byte and
// make the float negative
temperature &= ~(1 << 11);
temperature = temperature * -1;
}
temperature = extend12to16(temperature);

float DegreesC = temperature * 0.25;

Expand All @@ -89,15 +92,7 @@ float GridEYE::getPixelTemperatureFahrenheit(unsigned char pixelAddr)
unsigned char pixelLowRegister = TEMPERATURE_REGISTER_START + (2 * pixelAddr);
int16_t temperature = getRegister(pixelLowRegister, 2);

// temperature is reported as 12-bit twos complement
// check if temperature is negative
if(temperature & (1 << 11))
{
// if temperature is negative, mask out the sign byte and
// make the float negative
temperature &= ~(1 << 11);
temperature = temperature * -1;
}
temperature = extend12to16(temperature);

float DegreesF = (temperature * 0.25) * 1.8 + 32;

Expand Down Expand Up @@ -136,15 +131,7 @@ float GridEYE::getDeviceTemperature()

int16_t temperature = getRegister(THERMISTOR_REGISTER_LSB, 2);

// temperature is reported as 12-bit twos complement
// check if temperature is negative
if(temperature & (1 << 11))
{
// if temperature is negative, mask out the sign byte and
// make the float negative
temperature &= ~(1 << 11);
temperature = temperature * -1;
}
temperature = extend12to16(temperature);

float realTemperature = temperature * 0.0625;

Expand All @@ -157,15 +144,7 @@ float GridEYE::getDeviceTemperatureFahrenheit()

int16_t temperature = getRegister(THERMISTOR_REGISTER_LSB, 2);

// temperature is reported as 12-bit twos complement
// check if temperature is negative
if(temperature & (1 << 11))
{
// if temperature is negative, mask out the sign byte and
// make the float negative
temperature &= ~(1 << 11);
temperature = temperature * -1;
}
temperature = extend12to16(temperature);

float realTemperatureF = (temperature * 0.0625) * 1.8 + 32;

Expand Down Expand Up @@ -722,15 +701,7 @@ float GridEYE::getUpperInterruptValue()

int16_t temperature = getRegister(INT_LEVEL_REGISTER_UPPER_LSB, 2);

// temperature is reported as 12-bit twos complement
// check if temperature is negative
if(temperature & (1 << 11))
{
// if temperature is negative, mask out the sign byte and
// make the float negative
temperature &= ~(1 << 11);
temperature = temperature * -1;
}
temperature = extend12to16(temperature);

float DegreesC = temperature * 0.25;

Expand All @@ -750,15 +721,7 @@ float GridEYE::getUpperInterruptValueFahrenheit()

int16_t temperature = getRegister(INT_LEVEL_REGISTER_UPPER_LSB, 2);

// temperature is reported as 12-bit twos complement
// check if temperature is negative
if(temperature & (1 << 11))
{
// if temperature is negative, mask out the sign byte and
// make the float negative
temperature &= ~(1 << 11);
temperature = temperature * -1;
}
temperature = extend12to16(temperature);

float DegreesF = (temperature * 0.25) * 1.8 + 32;

Expand All @@ -771,15 +734,7 @@ float GridEYE::getLowerInterruptValue()

int16_t temperature = getRegister(INT_LEVEL_REGISTER_LOWER_LSB, 2);

// temperature is reported as 12-bit twos complement
// check if temperature is negative
if(temperature & (1 << 11))
{
// if temperature is negative, mask out the sign byte and
// make the float negative
temperature &= ~(1 << 11);
temperature = temperature * -1;
}
temperature = extend12to16(temperature);

float DegreesC = temperature * 0.25;

Expand All @@ -792,15 +747,7 @@ float GridEYE::getLowerInterruptValueFahrenheit()

int16_t temperature = getRegister(INT_LEVEL_REGISTER_LOWER_LSB, 2);

// temperature is reported as 12-bit twos complement
// check if temperature is negative
if(temperature & (1 << 11))
{
// if temperature is negative, mask out the sign byte and
// make the float negative
temperature &= ~(1 << 11);
temperature = temperature * -1;
}
temperature = extend12to16(temperature);

float DegreesF = (temperature * 0.25) * 1.8 + 32;

Expand All @@ -820,15 +767,7 @@ float GridEYE::getInterruptHysteresis()

int16_t temperature = getRegister(INT_LEVEL_REGISTER_HYST_LSB, 2);

// temperature is reported as 12-bit twos complement
// check if temperature is negative
if(temperature & (1 << 11))
{
// if temperature is negative, mask out the sign byte and
// make the float negative
temperature &= ~(1 << 11);
temperature = temperature * -1;
}
temperature = extend12to16(temperature);

float DegreesC = temperature * 0.25;

Expand All @@ -841,15 +780,7 @@ float GridEYE::getInterruptHysteresisFahrenheit()

int16_t temperature = getRegister(INT_LEVEL_REGISTER_HYST_LSB, 2);

// temperature is reported as 12-bit twos complement
// check if temperature is negative
if(temperature & (1 << 11))
{
// if temperature is negative, mask out the sign byte and
// make the float negative
temperature &= ~(1 << 11);
temperature = temperature * -1;
}
temperature = extend12to16(temperature);

float DegreesF = (temperature * 0.25) * 1.8 + 32;

Expand Down Expand Up @@ -908,4 +839,4 @@ int16_t GridEYE::getRegister(unsigned char reg, int8_t len)

return result;

}
}