MityDSP::tcDspDac8534 Class Reference

Instances of this class handle access to a TI DAC8534 digital-to-analog converter via the generic SPI interface for the MityDSP. More...

#include <core/DspDac8534.h>

List of all members.

Public Types
enum	teLoadCommand { eeLoadNone = 0, eeLoadSingle = 1, eeLoadAll = 2, eeBroadcast = 3 }
	The teLoadCommand enumeration defines various options for loading one or more 8534 devices on the SPI bus. More...

Public Member Functions
	tcDspDac8534 (tcDspSpi *apSpi, unsigned int anSpiAddr, tcDspOutputLatch *apLatch=NULL, unsigned int anLatchID=0)
	This constructor is used to open an interface to a DAC8534 via the provided SPI interface.
	~tcDspDac8534 ()
	Default destructor.
bool	update (unsigned int anChannel, unsigned short anData, teLoadCommand aeLoad=eeLoadSingle)
	Updates the specified DAC channel with the provided 16-bit data.

Static Public Attributes
static const int	gnDAC_CHANNEL_A = 0
	Constants for each of the 4 available channels on this device.
static const int	gnDAC_CHANNEL_B = 1
static const int	gnDAC_CHANNEL_C = 2
static const int	gnDAC_CHANNEL_D = 3
static const int	gnNUM_CHANNELS = 4

Protected Attributes
tcDspSpi *	mpSpi
	Access to the SPI bus.
unsigned int	mnSpiAddr
	Device address on SPI bus.
tcDspOutputLatch *	mpLatch
	Access to latch selector.
unsigned int	mnLatchID
	ID of latch to use (if any)
unsigned short	mnLastData [gnNUM_CHANNELS]
	Last data written to DAC.

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Detailed Description

Instances of this class handle access to a TI DAC8534 digital-to-analog converter via the generic SPI interface for the MityDSP.

See also:

tcDspDac8534 Page

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Member Enumeration Documentation

enum MityDSP::tcDspDac8534::teLoadCommand

The teLoadCommand enumeration defines various options for loading one or more 8534 devices on the SPI bus.

Enumerator:

eeLoadNone	don't load value into DAC
eeLoadSingle	load value into current channel
eeLoadAll	load all channels with their current data
eeBroadcast	broadcast to all DAC's on this SPI

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Constructor & Destructor Documentation

tcDspDac8534::tcDspDac8534	(	tcDspSpi *	apSpi,
		unsigned int	anSpiAddr,
		tcDspOutputLatch *	apLatch = NULL,
		unsigned int	anLatchID = 0
	)

This constructor is used to open an interface to a DAC8534 via the provided SPI interface.

Parameters:

[in]	apSpi	Pointer to the SPI interface for the DAC8534.
[in]	anSpiAddr	Address of device on the SPI (0-3).
[in]	apLatch	Point to an output latch (default:NULL)
[in]	anLatchID	ID of the latch to use for this device, if any

Returns:

None.

See also:

DspDac8534.h

tcDspDac8534::~tcDspDac8534

(

)

Default destructor.

Returns:

None.

See also:

DspDac8534.h

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Member Function Documentation

bool tcDspDac8534::update	(	unsigned int	anChannel,
		unsigned short	anData,
		teLoadCommand	aeLoad = eeLoadSingle
	)

Updates the specified DAC channel with the provided 16-bit data.

By default, the data is loaded to the DAC output immediately. However, the data can also be written and not loaded, or the data can be written and all DAC channels loaded (this supports simultaneously changing the values on all 4 channels).

Parameters:

[in]	anChannel	DAC channel to write (0-3).
[in]	anData	16-bit data to load to specified DAC channel.
[in]	aeLoad	Specifies if and when data is loaded (eeLoadNone, eeLoadSingle, eeLoadAll).

Returns:

true if successful

See also:

DspDac8534.h

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Member Data Documentation

const int MityDSP::tcDspDac8534::gnDAC_CHANNEL_A = 0

static

Constants for each of the 4 available channels on this device.

const int MityDSP::tcDspDac8534::gnDAC_CHANNEL_B = 1

static

const int MityDSP::tcDspDac8534::gnDAC_CHANNEL_C = 2

static

const int MityDSP::tcDspDac8534::gnDAC_CHANNEL_D = 3

static

const int MityDSP::tcDspDac8534::gnNUM_CHANNELS = 4

static

tcDspSpi* MityDSP::tcDspDac8534::mpSpi

protected

Access to the SPI bus.

unsigned int MityDSP::tcDspDac8534::mnSpiAddr

protected

Device address on SPI bus.

tcDspOutputLatch* MityDSP::tcDspDac8534::mpLatch

protected

Access to latch selector.

unsigned int MityDSP::tcDspDac8534::mnLatchID

protected

ID of latch to use (if any)

unsigned short MityDSP::tcDspDac8534::mnLastData[gnNUM_CHANNELS]

protected

Last data written to DAC.