Analog Class

class AnalogClass : public Acroname::BrainStem::EntityClass

AnalogClass: 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(void)

Constructor.

~AnalogClass(void)

Destructor.

void init(Module *pModule, const uint8_t index)

Initialize the class.

Parameters:

• pModule – The module to which this entity belongs.

• index – The index of the analog entity being initialized.

aErr getValue(uint16_t *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 getVoltage(int32_t *microvolts)

Get the scaled micro volt value with reference 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 getRange(uint8_t *range)

Get the analog input range.

Parameters:

range – 8 bit value corresponding to a discrete range option

Returns:

Returns common entity return values

aErr getEnable(uint8_t *enable)

Get the analog output enable status.

Parameters:

enable – 0 if disabled 1 if enabled.

Returns:

Returns common entity return values

aErr setValue(const uint16_t 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 setVoltage(const int32_t 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 setRange(const uint8_t range)

Set the analog input range.

Parameters:

range – 8 bit value corresponding to a discrete range option

Returns:

Returns common entity return values

aErr setEnable(const uint8_t enable)

Set the analog output enable state.

Parameters:

enable – set 1 to enable or 0 to disable.

Returns:

Returns common entity return values

aErr setConfiguration(const uint8_t 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 getConfiguration(uint8_t *configuration)

Get the analog configuration.

Parameters:

configuration – - Current configuration of the analog entity.

Returns:

Returns common entity return values

aErr setBulkCaptureSampleRate(const uint32_t 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 getBulkCaptureSampleRate(uint32_t *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 setBulkCaptureNumberOfSamples(const uint32_t 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 getBulkCaptureNumberOfSamples(uint32_t *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 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 byte 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(uint8_t *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