testAsynPortDriver Class Reference

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

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().
virtual asynStatus	drvUserCreate (asynUser *pasynUser, const char *drvInfo, const char **pptypeName, size_t *psize)
	Called by asynManager to pass a pasynUser structure and drvInfo string to the driver; assigns pasynUser->reason to one of the testParams enum value based on the value of the drvInfo string.
void	simTask (void)
	Simulation task that runs as a separate thread.

---

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::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:

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

Reimplemented from asynPortDriver.

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::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.

asynStatus testAsynPortDriver::drvUserCreate	(	asynUser *	pasynUser,
		const char *	drvInfo,
		const char **	pptypeName,
		size_t *	psize
	)			[virtual]

Called by asynManager to pass a pasynUser structure and drvInfo string to the driver; assigns pasynUser->reason to one of the testParams enum value based on the value of the drvInfo string.

Simply calls asynPortDriver::drvUserCreateParam with the parameter table for this driver.

Parameters:

[in]	pasynUser	pasynUser structure that driver modifies
[in]	drvInfo	String containing information about what driver function is being referenced
[out]	pptypeName	Location in which driver puts a copy of drvInfo.
[out]	psize	Location where driver puts size of param.

Returns:

Returns asynSuccess if a matching string was found, asynError if not found.

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.

---

The documentation for this class was generated from the following file:

• /home/phoebus/NORUME/tmp/asyn-4.12/testAsynPortDriverApp/src/testAsynPortDriver.cpp