Class that demonstrates the use of the asynPortDriver base class to greatly simplify the task of writing an asyn port driver. More...

#include <testAsynPortDriver.h>

Inheritance diagram for testAsynPortDriver:

List of all members.

Public Member Functions
	testAsynPortDriver (const char *portName, int maxArraySize)
	Constructor for the testAsynPortDriver class.
virtual asynStatus	writeInt32 (asynUser *pasynUser, epicsInt32 value)
	Called when asyn clients call pasynInt32->write().
virtual asynStatus	writeFloat64 (asynUser *pasynUser, epicsFloat64 value)
	Called when asyn clients call pasynFloat64->write().
virtual asynStatus	readFloat64Array (asynUser pasynUser, epicsFloat64 value, size_t nElements, size_t *nIn)
	Called when asyn clients call pasynFloat64Array->read().
void	simTask (void)
	Simulation task that runs as a separate thread.
Protected Attributes
int	P_Run
	Values used for pasynUser->reason, and indexes into the parameter library.
int	P_MaxPoints
int	P_TimePerDivision
int	P_VoltsPerDivision
int	P_VoltOffset
int	P_TriggerDelay
int	P_NoiseAmplitude
int	P_UpdateTime
int	P_Waveform
int	P_TimeBase
int	P_MinValue
int	P_MaxValue
int	P_MeanValue

Detailed Description

Class that demonstrates the use of the asynPortDriver base class to greatly simplify the task of writing an asyn port driver.

This class does a simple simulation of a digital oscilloscope. It computes a waveform, computes statistics on the waveform, and does callbacks with the statistics and the waveform data itself. I have made the methods of this class public in order to generate doxygen documentation for them, but they should really all be private.

Constructor & Destructor Documentation

testAsynPortDriver::testAsynPortDriver	(	const char *	portName,
		int	maxPoints
	)

Constructor for the testAsynPortDriver class.

Calls constructor for the asynPortDriver base class.

Parameters:

[in]	portName	The name of the asyn port driver to be created.
[in]	maxPoints	The maximum number of points in the volt and time arrays

Member Function Documentation

asynStatus testAsynPortDriver::readFloat64Array	(	asynUser *	pasynUser,
		epicsFloat64 *	value,
		size_t	nElements,
		size_t *	nIn
	)		`[virtual]`

Called when asyn clients call pasynFloat64Array->read().

Returns the value of the P_Waveform or P_TimeBase arrays.

Parameters:

[in]	pasynUser	pasynUser structure that encodes the reason and address.
[in]	value	Pointer to the array to read.
[in]	nElements	Number of elements to read.
[out]	nIn	Number of elements actually read.

Reimplemented from asynPortDriver.

void testAsynPortDriver::simTask ( void )

Simulation task that runs as a separate thread.

When the P_Run parameter is set to 1 to rub the simulation it computes a 1 kHz sine wave with 1V amplitude and user-controllable noise, and displays it on a simulated scope. It computes waveforms for the X (time) and Y (volt) axes, and computes statistics about the waveform.

asynStatus testAsynPortDriver::writeFloat64	(	asynUser *	pasynUser,
		epicsFloat64	value
	)		`[virtual]`

Called when asyn clients call pasynFloat64->write().

This function sends a signal to the simTask thread if the value of P_UpdateTime has changed. For all parameters it sets the value in the parameter library and calls any registered callbacks.

Parameters:

[in]	pasynUser	pasynUser structure that encodes the reason and address.
[in]	value	Value to write.

Reimplemented from asynPortDriver.

asynStatus testAsynPortDriver::writeInt32	(	asynUser *	pasynUser,
		epicsInt32	value
	)		`[virtual]`

Called when asyn clients call pasynInt32->write().

This function sends a signal to the simTask thread if the value of P_Run has changed. For all parameters it sets the value in the parameter library and calls any registered callbacks..

Parameters: