AIOUSB::AnalogOutputSubsystem Class Reference

#include <AnalogOutputSubsystem.hpp>

Inheritance diagram for AIOUSB::AnalogOutputSubsystem:

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Collaboration diagram for AIOUSB::AnalogOutputSubsystem:

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List of all members.

Public Member Functions
virtual std::ostream &	print (std::ostream &out)
int	getNumChannels () const
AnalogOutputSubsystem &	writeCounts (int channel, unsigned short counts)
AnalogOutputSubsystem &	writeCounts (const UShortArray &points)
Protected Member Functions
	AnalogOutputSubsystem (USBDevice &parent)
virtual	~AnalogOutputSubsystem ()
Protected Attributes
int	numChannels
int	minCounts
int	maxCounts

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Detailed Description

Class AnalogOutputSubsystem is the superclass of the analog output subsystem of a device. This class provides basic features, such as writing count values to the D/As. More sophisticated functions are provided by device-specific subclasses. One accesses this analog output subsystem through its parent object, typically through a method such as dac() (see USB_AO16_Family::dac()).

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Constructor & Destructor Documentation

AIOUSB::AnalogOutputSubsystem::AnalogOutputSubsystem

(

USBDevice &

parent

)

[protected]

AIOUSB::AnalogOutputSubsystem::~AnalogOutputSubsystem

(

)

[protected, virtual]

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Member Function Documentation

int AIOUSB::AnalogOutputSubsystem::getNumChannels

(

)

const [inline]

Gets the number of analog output channels.

Returns:

Number of channels, numbered 0 to n-1.

ostream & AIOUSB::AnalogOutputSubsystem::print

(

std::ostream &

out

)

[virtual]

Prints the properties of this subsystem. Mainly useful for diagnostic purposes.

Parameters:

out

the print stream where properties will be printed.

Returns:

The print stream.

Implements AIOUSB::DeviceSubsystem.

AnalogOutputSubsystem & AIOUSB::AnalogOutputSubsystem::writeCounts

(

const UShortArray &

points

)

Writes a block of count values to one or more D/A channels.

Parameters:

points

an array of 16-bit integers representing channel-count pairs. The first integer of each pair is the D/A channel number and the second integer is the D/A count value to output to the specified channel. Refer to writeCounts( int channel, unsigned short counts ) for an explanation of the channel addressing and count values.

Returns:

This subsystem, useful for chaining together multiple operations.

Exceptions:

	IllegalArgumentException
	OperationFailedException

AnalogOutputSubsystem & AIOUSB::AnalogOutputSubsystem::writeCounts	(	int	channel,
		unsigned short	counts
	)

Writes a count value to a D/A channel.

Parameters:

	channel	the channel to write to.
	counts	the D/A count value to output. The number of bits of resolution for the D/A outputs varies from model to model, however it's usually 12 or 16 bits. Moreover, some of the 12-bit models actually accept a 16-bit value and simply truncate the least significant 4 bits. Consult the manual for the specific device to determine the range of D/A values the device will accept. In general, 12-bit devices accept a count range of 0-0xfff, and 16-bit devices accept a count range of 0-0xffff.

Returns:

This subsystem, useful for chaining together multiple operations.

Exceptions:

	IllegalArgumentException
	OperationFailedException

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Member Data Documentation

int AIOUSB::AnalogOutputSubsystem::maxCounts [protected]

int AIOUSB::AnalogOutputSubsystem::minCounts [protected]

int AIOUSB::AnalogOutputSubsystem::numChannels [protected]