MityDSP::tcDspThermBase Class Reference

The tcDspThermBase class is a virtual base class to provide consistent access to various thermistor devices. More...

#include <core/DspThermBase.h>

Inheritance diagram for MityDSP::tcDspThermBase:

List of all members.

Public Member Functions
	tcDspThermBase (float anVref, unsigned int anAdcBits, float anFeedbackR, float anBeta)
	This constructor is used to initialize the thermistor base class.
virtual	~tcDspThermBase ()
	Destructor.
virtual void	SetSensorVal (unsigned short anVal)
	This routine updates the sensor's current value, and computes the matching temperature.
virtual float	GetSensorTemp (void)
	This routine returns a given sensor's current temperature, in deg-C.
virtual void	GetThermoParams (float &arT0, float &arRt0, float &arVin)
	This routine returns the current constants in use by the Thermistor derived class.
virtual bool	SetThermoParams (float anT0=0.0f, float anRt0=0.0f, float anVin=0.0f)
	This routine may be used to update the constants in use by the Thermistor derived class.

Static Public Attributes
static const int	gnKelvinToCentigrade = 273
	Conversion from deg-K to deg-C.

Protected Member Functions
virtual void	ComputeTemp (void)=0

Protected Attributes
SEM_Handle	mhMutex
	Serial access across threads.
unsigned int	mnAdcSteps
	ADC data range.
float	mnVReference
	Reference voltage.
float	mnFeebackR
	feedback resistor value (ohms)
float	mnBeta
	thermistor beta value
unsigned short	mnAdcCount
	last-known ADC count
float	mnTempDegC
	last computed temperature (deg-C)
float	mnT0
	Temperature T0 (in deg-K)
float	mnRt0
	Resistance @ T0.
float	mnVin
	Thermistor input voltage.

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Detailed Description

The tcDspThermBase class is a virtual base class to provide consistent access to various thermistor devices.

It provides functions for converting ADC counts into temperatures and storing the last-known values.

See also:

tcDspThermBase Page

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Constructor & Destructor Documentation

tcDspThermBase::tcDspThermBase	(	float	anVref,
		unsigned int	anAdcBits,
		float	anFeedbackR,
		float	anBeta
	)

This constructor is used to initialize the thermistor base class.

Parameters:

[in]	anVref	Reference voltage for the thermistor.
[in]	anAdcBits	Number of bits returned by ADC.
[in]	anFeedbackR	Feedback resistor value.
[in]	anBeta	Thermistor Beta value.

tcDspThermBase::~tcDspThermBase ( )

virtual

Destructor.

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Member Function Documentation

void tcDspThermBase::SetSensorVal ( unsigned short  anVal )

virtual

This routine updates the sensor's current value, and computes the matching temperature.

Parameters:

[in]

anVal

Latest ADC value.

Returns:

None.

float tcDspThermBase::GetSensorTemp ( void  )

virtual

This routine returns a given sensor's current temperature, in deg-C.

Returns:

Last-known temperature value (deg-C).

void tcDspThermBase::GetThermoParams ( float &  arT0, float &  arRt0, float &  arVin  )

virtual

This routine returns the current constants in use by the Thermistor derived class.

It is provided mainly for situations where fine tuning of the default parameters may be required.

Parameters:

[in]	arT0	Reference to T0 temperature (deg-K)
[in]	arRt0	Reference to resistance at T0 (ohms)
[in]	arVin	Reference to thermistor input voltage (volts)

Returns:

None.

bool tcDspThermBase::SetThermoParams ( float  anT0 = 0.0f, float  anRt0 = 0.0f, float  anVin = 0.0f  )

virtual

This routine may be used to update the constants in use by the Thermistor derived class.

It is provided mainly for situations where fine tuning of the default parameters may be required.

Note:

Any parameter with a value of zero is not updated.

Parameters:

[in]	anT0	New T0 temperature (deg-K)
[in]	anRt0	New resistance at T0 (ohms)
[in]	anVin	New thermistor input voltage (volts)

Returns:

Number of parameters updated.

virtual void MityDSP::tcDspThermBase::ComputeTemp ( void  )

protectedpure virtual

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Member Data Documentation

const int MityDSP::tcDspThermBase::gnKelvinToCentigrade = 273

static

Conversion from deg-K to deg-C.

SEM_Handle MityDSP::tcDspThermBase::mhMutex

protected

Serial access across threads.

unsigned int MityDSP::tcDspThermBase::mnAdcSteps

protected

ADC data range.

float MityDSP::tcDspThermBase::mnVReference

protected

Reference voltage.

float MityDSP::tcDspThermBase::mnFeebackR

protected

feedback resistor value (ohms)

float MityDSP::tcDspThermBase::mnBeta

protected

thermistor beta value

unsigned short MityDSP::tcDspThermBase::mnAdcCount

protected

last-known ADC count

float MityDSP::tcDspThermBase::mnTempDegC

protected

last computed temperature (deg-C)

float MityDSP::tcDspThermBase::mnT0

protected

Temperature T0 (in deg-K)

float MityDSP::tcDspThermBase::mnRt0

protected

Resistance @ T0.

float MityDSP::tcDspThermBase::mnVin

protected

Thermistor input voltage.