Analog Class

class AnalogClass

The AnalogClass is the interface to analog entities on BrainStem modules. Analog entities may be configured as a input or output depending on hardware capabilities. Some modules are capable of providing actual voltage readings, while other simply return the raw analog-to-digital converter (ADC) output value. The resolution of the voltage or number of useful bits is also hardware dependent.

Public Functions

AnalogClass()

Constructors.

~AnalogClass()

Destructor.

!AnalogClass ()

Finalizer.

void init (BrainStem2CLI::ModuleClass^ module, const unsigned char index)

Initializes the class. Should only be called when manually creating classes.

Parameters:

• pModule – The module.

• index – The cmdANALOG index to be addressed.

aErr getValue(unsigned short %value)

Get the raw ADC output value in bits.

Note

Not all modules are provide 16 useful bits; this value’s least significant bits are zero-padded to 16 bits. Refer to the module’s datasheet to determine analog bit depth and reference voltage.

Parameters:

value – 16 bit analog reading with 0 corresponding to the negative analog voltage reference and 0xFFFF corresponding to the positive analog voltage reference.

Returns:

Returns common entity return values

aErr setValue(const unsigned short value)

Set the value of an analog output (DAC) in bits.

Note

Not all modules are provide 16 useful bits; the least significant bits are discarded. E.g. for a 10 bit DAC, 0xFFC0 to 0x0040 is the useful range. Refer to the module’s datasheet to determine analog bit depth and reference voltage.

Parameters:

value – 16 bit analog set point with 0 corresponding to the negative analog voltage reference and 0xFFFF corresponding to the positive analog voltage reference.

Returns:

Returns common entity return values

aErr getVoltage(int %microvolts)

Get the scaled micro volt value with refrence to ground.

Note

Not all modules provide 32 bits of accuracy; Refer to the module’s datasheet to determine the analog bit depth and reference voltage.

Parameters:

microvolts – 32 bit signed integer (in microvolts) based on the board’s ground and reference voltages.

Returns:

Returns common entity return values

aErr setVoltage(const int microvolts)

Set the voltage level of an analog output (DAC) in microvolts.

Note

Voltage range is dependent on the specific DAC channel range.

Parameters:

microvolts – 32 bit signed integer (in microvolts) based on the board’s ground and reference voltages.

Returns:

Returns common entity return values

aErr getEnable(unsigned char %enable)

Get the analog output enable status.

Parameters:

enable – 0 if disabled 1 if enabled.

Returns:

Returns common entity return values

aErr setEnable(const unsigned char enable)

Set the analog output enable state.

Parameters:

enable – set 1 to enable or 0 to disable.

Returns:

Returns common entity return values

aErr getRange(unsigned char %range)

Get the analog input range.

Parameters:

range – 8 bit value corresponding to a discrete range option

Returns:

Returns common entity return values

aErr setRange(const unsigned char range)

Set the analog input range.

Parameters:

range – 8 bit value corresponding to a discrete range option

Returns:

Returns common entity return values

aErr getConfiguration(unsigned char %configuration)

Get the analog configuration.

Parameters:

configuration – - Current configuration of the analog entity.

Returns:

Returns common entity return values

aErr setConfiguration(const unsigned char configuration)

Set the analog configuration.

Parameters:

configuration – - bitAnalogConfigurationOutput configures the analog entity as an output.

Return values:

aErrConfiguration – - Entity does not support this configuration.

Returns:

EntityReturnValues “common entity” return values

aErr getBulkCaptureSampleRate(unsigned int %value)

Get the current sample rate setting for this analog when bulk capturing.

Parameters:

value – upon success filled with current sample rate in samples per second (Hertz).

Returns:

Returns common entity return values

aErr setBulkCaptureSampleRate(const unsigned int value)

Set the sample rate for this analog when bulk capturing.

Parameters:

value – sample rate in samples per second (Hertz). Minimum rate: 7,000 Hz Maximum rate: 200,000 Hz

Returns:

Returns common entity return values

aErr getBulkCaptureNumberOfSamples(unsigned int %value)

get the current number of samples setting for this analog when bulk capturing.

Parameters:

value – number of samples.

Returns:

Returns common entity return values

aErr setBulkCaptureNumberOfSamples(const unsigned int value)

Set the number of samples to capture for this analog when bulk capturing.

Parameters:

value – number of samples. Minimum # of Samples: 0 Maximum # of Samples: (BRAINSTEM_RAM_SLOT_SIZE / 2) = (3FFF / 2) = 1FFF = 8191

Returns:

Returns common entity return values

aErr initiateBulkCapture(void)

Initiate a BulkCapture on this analog. Captured measurements are stored in the module’s RAM store (RAM_STORE) slot 0. Data is stored in a contiguous unsigned char array with each sample stored in two consecutive bytes, LSB first.

Returns:

Returns common entity return values. When the bulk capture is complete getBulkCaptureState() will return either bulkCaptureFinished or bulkCaptureError.

aErr getBulkCaptureState(unsigned char %state)

get the current bulk capture state for this analog.

Parameters:

state – the state of bulk capture.

• Idle: bulkCaptureIdle = 0

• Pending: bulkCapturePending = 1

• Finished: bulkCaptureFinished = 2

• Error: bulkCaptureError = 3

Returns:

Returns common entity return values