/*****************************************************************************
* Function Name: ProcessTemperature()
******************************************************************************
* Summary:
* Measures the current temperature.
*
* Parameters:
* None
*
* Return:
* uint32 - Measured temperature
*
* Theory:
* This function measures the reference voltage, thermistor voltage and
* offset voltage.
* Channel 0 - Reference voltage
* Channel 1 - Thermistor voltage
* Channel 2 - Offset voltage
*
* This function removes offset via correlated double sampling and then
* measures the temperature.
*
* Side Effects:
* None
*
* Note:
*
*****************************************************************************/
int32 ProcessTemperature (void)
{
/* Local variables used for temperature measurement */
static int32 temperature = 0;
#if (SIMULATE_TEMPERATURE_SENSOR)
int32 thermistorResistance = 0;
int16 referenceVoltage = 0;
int16 thermistorVoltage = 0;
int16 offsetVoltage = 0;
/* Check if measurement interval has expired */
if(SystemFlag & MEASUREMENT_INTERVAL)
{
/* Disconnect all the pins from Amux input */
AMuxSeq_DisconnectAll();
/* Measure reference voltage - Channel 0 */
referenceVoltage = MeasureSensorVoltage();
/* Measure thermistor voltage - Channel 0 */
thermistorVoltage = MeasureSensorVoltage();
/* Measure offset voltage - Channel 0 */
offsetVoltage = MeasureSensorVoltage();
/* Measure thermistor resistance and remove offset by using correlated
* double sampling. */
thermistorResistance = Thermistor_GetResistance((referenceVoltage - offsetVoltage), (thermistorVoltage - offsetVoltage));
/* Compute temperature and remove decimal places */
temperature = Thermistor_GetTemperature(thermistorResistance);
temperature = temperature / 100;
}
#else
/* Check if measurement interval has expired */
if (SystemFlag & MEASUREMENT_INTERVAL)
{
temperature++;
if(temperature > 100)
{
temperature = 0;
}
}
#endif
/* Return measured temperature */
return (temperature);
}
/*******************************************************************************
* Function Name: AMuxSeq_Stop
********************************************************************************
* Summary:
* Disconnect all channels. The next time Next is called, channel 0 will be
* connected.
*
* Parameters:
* void
*
* Return:
* void
*
*******************************************************************************/
void AMuxSeq_Stop(void)
{
AMuxSeq_DisconnectAll();
}
/*******************************************************************************
* Function Name: AMuxSeq_Init
********************************************************************************
* Summary:
* Disconnect all channels. The next time Next is called, channel 0 will be
* connected.
*
* Parameters:
* void
*
* Return:
* void
*
*******************************************************************************/
void AMuxSeq_Init(void)
{
AMuxSeq_DisconnectAll();
}
/*******************************************************************************
* Function Name: AMuxSeq_Start
********************************************************************************
* Summary:
* Disconnect all channels. The next time Next is called, channel 0 will be
* connected.
*
* Parameters:
* void
*
* Return:
* void
*
*******************************************************************************/
void AMuxSeq_Start(void)
{
AMuxSeq_DisconnectAll();
AMuxSeq_initVar = 1u;
}
