Software / API Bindings / Delphi/Lazarus / API Reference and Examples / Bricklets / Sound Pressure Level Bricklet

Delphi/Lazarus - Sound Pressure Level Bricklet¶

This is the description of the Delphi/Lazarus API bindings for the Sound Pressure Level Bricklet. General information and technical specifications for the Sound Pressure Level Bricklet are summarized in its hardware description.

An installation guide for the Delphi/Lazarus API bindings is part of their general description.

Examples¶

The example code below is Public Domain (CC0 1.0).

Simple¶

Download (ExampleSimple.pas)

program ExampleSimple;

{$ifdef MSWINDOWS}{$apptype CONSOLE}{$endif}
{$ifdef FPC}{$mode OBJFPC}{$H+}{$endif}

uses
  SysUtils, IPConnection, BrickletSoundPressureLevel;

type
  TExample = class
  private
    ipcon: TIPConnection;
    spl: TBrickletSoundPressureLevel;
  public
    procedure Execute;
  end;

const
  HOST = 'localhost';
  PORT = 4223;
  UID = 'XYZ'; { Change XYZ to the UID of your Sound Pressure Level Bricklet }

var
  e: TExample;

procedure TExample.Execute;
var decibel: word;
begin
  { Create IP connection }
  ipcon := TIPConnection.Create;

  { Create device object }
  spl := TBrickletSoundPressureLevel.Create(UID, ipcon);

  { Connect to brickd }
  ipcon.Connect(HOST, PORT);
  { Don't use device before ipcon is connected }

  { Get current decibel }
  decibel := spl.GetDecibel;
  WriteLn(Format('Decibel: %f dB(A)', [decibel/10.0]));

  WriteLn('Press key to exit');
  ReadLn;
  ipcon.Destroy; { Calls ipcon.Disconnect internally }
end;

begin
  e := TExample.Create;
  e.Execute;
  e.Destroy;
end.

Callback¶

Download (ExampleCallback.pas)

program ExampleCallback;

{$ifdef MSWINDOWS}{$apptype CONSOLE}{$endif}
{$ifdef FPC}{$mode OBJFPC}{$H+}{$endif}

uses
  SysUtils, IPConnection, BrickletSoundPressureLevel;

type
  TExample = class
  private
    ipcon: TIPConnection;
    spl: TBrickletSoundPressureLevel;
  public
    procedure DecibelCB(sender: TBrickletSoundPressureLevel; const decibel: word);
    procedure Execute;
  end;

const
  HOST = 'localhost';
  PORT = 4223;
  UID = 'XYZ'; { Change XYZ to the UID of your Sound Pressure Level Bricklet }

var
  e: TExample;

{ Callback procedure for decibel callback }
procedure TExample.DecibelCB(sender: TBrickletSoundPressureLevel; const decibel: word);
begin
  WriteLn(Format('Decibel: %f dB(A)', [decibel/10.0]));
end;

procedure TExample.Execute;
begin
  { Create IP connection }
  ipcon := TIPConnection.Create;

  { Create device object }
  spl := TBrickletSoundPressureLevel.Create(UID, ipcon);

  { Connect to brickd }
  ipcon.Connect(HOST, PORT);
  { Don't use device before ipcon is connected }

  { Register decibel callback to procedure DecibelCB }
  spl.OnDecibel := {$ifdef FPC}@{$endif}DecibelCB;

  { Set period for decibel callback to 1s (1000ms) without a threshold }
  spl.SetDecibelCallbackConfiguration(1000, false, 'x', 0, 0);

  WriteLn('Press key to exit');
  ReadLn;
  ipcon.Destroy; { Calls ipcon.Disconnect internally }
end;

begin
  e := TExample.Create;
  e.Execute;
  e.Destroy;
end.

Threshold¶

Download (ExampleThreshold.pas)

program ExampleThreshold;

{$ifdef MSWINDOWS}{$apptype CONSOLE}{$endif}
{$ifdef FPC}{$mode OBJFPC}{$H+}{$endif}

uses
  SysUtils, IPConnection, BrickletSoundPressureLevel;

type
  TExample = class
  private
    ipcon: TIPConnection;
    spl: TBrickletSoundPressureLevel;
  public
    procedure DecibelCB(sender: TBrickletSoundPressureLevel; const decibel: word);
    procedure Execute;
  end;

const
  HOST = 'localhost';
  PORT = 4223;
  UID = 'XYZ'; { Change XYZ to the UID of your Sound Pressure Level Bricklet }

var
  e: TExample;

{ Callback procedure for decibel callback }
procedure TExample.DecibelCB(sender: TBrickletSoundPressureLevel; const decibel: word);
begin
  WriteLn(Format('Decibel: %f dB(A)', [decibel/10.0]));
end;

procedure TExample.Execute;
begin
  { Create IP connection }
  ipcon := TIPConnection.Create;

  { Create device object }
  spl := TBrickletSoundPressureLevel.Create(UID, ipcon);

  { Connect to brickd }
  ipcon.Connect(HOST, PORT);
  { Don't use device before ipcon is connected }

  { Register decibel callback to procedure DecibelCB }
  spl.OnDecibel := {$ifdef FPC}@{$endif}DecibelCB;

  { Configure threshold for decibel "greater than 60 dB(A)"
    with a debounce period of 1s (1000ms) }
  spl.SetDecibelCallbackConfiguration(1000, false, '>', 60*10, 0);

  WriteLn('Press key to exit');
  ReadLn;
  ipcon.Destroy; { Calls ipcon.Disconnect internally }
end;

begin
  e := TExample.Create;
  e.Execute;
  e.Destroy;
end.

API¶

Since Delphi does not support multiple return values directly, we use the out keyword to return multiple values from a function.

All functions and procedures listed below are thread-safe.

Basic Functions¶

constructor TBrickletSoundPressureLevel.Create(const uid: string; ipcon: TIPConnection)¶

Parameters:	uid – Type: string ipcon – Type: TIPConnection
Returns:	soundPressureLevel – Type: TBrickletSoundPressureLevel

Creates an object with the unique device ID uid:

soundPressureLevel := TBrickletSoundPressureLevel.Create('YOUR_DEVICE_UID', ipcon);

This object can then be used after the IP Connection is connected.

function TBrickletSoundPressureLevel.GetDecibel: word¶

Returns:	decibel – Type: word, Unit: 1/10 dB, Range: [0 to 120]

Returns the measured sound pressure in decibels.

The Bricklet supports the weighting standards dB(A), dB(B), dB(C), dB(D), dB(Z) and ITU-R 468. You can configure the weighting with SetConfiguration.

By default dB(A) will be used.

If you want to get the value periodically, it is recommended to use the OnDecibel callback. You can set the callback configuration with SetDecibelCallbackConfiguration.

function TBrickletSoundPressureLevel.GetSpectrum: array of word¶

Returns:	spectrum – Type: array of word, Unit: ? dB, Range: [0 to 2¹⁶ - 1]

Returns the frequency spectrum. The length of the spectrum is between 512 (FFT size 1024) and 64 (FFT size 128). See SetConfiguration.

Each array element is one bin of the FFT. The first bin is always the DC offset and the other bins have a size between 40Hz (FFT size 1024) and 320Hz (FFT size 128).

In sum the frequency of the spectrum always has a range from 0 to 20480Hz (the FFT is applied to samples with a frequency of 40960Hz).

The returned data is already equalized, which means that the microphone frequency response is compensated and the weighting function is applied (see SetConfiguration for the available weighting standards). Use dB(Z) if you need the unaltered spectrum.

The values are not in dB form yet. If you want a proper dB scale of the spectrum you have to apply the formula f(x) = 20*log10(max(1, x/sqrt(2))) on each value.

procedure TBrickletSoundPressureLevel.SetConfiguration(const fftSize: byte; const weighting: byte)¶

Parameters:	fftSize – Type: byte, Range: See constants, Default: 3 weighting – Type: byte, Range: See constants, Default: 0

Sets the Sound Pressure Level Bricklet configuration.

With different FFT sizes the Bricklet has a different amount of samples per second and the size of the FFT bins changes. The higher the FFT size the more precise is the result of the dB(X) calculation.

Available FFT sizes are:

1024: 512 bins, 10 samples per second, each bin has size 40Hz
512: 256 bins, 20 samples per second, each bin has size 80Hz
256: 128 bins, 40 samples per second, each bin has size 160Hz
128: 64 bins, 80 samples per second, each bin has size 320Hz

The Bricklet supports different weighting functions. You can choose between dB(A), dB(B), dB(C), dB(D), dB(Z) and ITU-R 468.

dB(A/B/C/D) are the standard dB weighting curves. dB(A) is often used to measure volumes at concerts etc. dB(Z) has a flat response, no weighting is applied. ITU-R 468 is an ITU weighting standard mostly used in the UK and Europe.

The following constants are available for this function:

For fftSize:

BRICKLET_SOUND_PRESSURE_LEVEL_FFT_SIZE_128 = 0
BRICKLET_SOUND_PRESSURE_LEVEL_FFT_SIZE_256 = 1
BRICKLET_SOUND_PRESSURE_LEVEL_FFT_SIZE_512 = 2
BRICKLET_SOUND_PRESSURE_LEVEL_FFT_SIZE_1024 = 3

For weighting:

BRICKLET_SOUND_PRESSURE_LEVEL_WEIGHTING_A = 0
BRICKLET_SOUND_PRESSURE_LEVEL_WEIGHTING_B = 1
BRICKLET_SOUND_PRESSURE_LEVEL_WEIGHTING_C = 2
BRICKLET_SOUND_PRESSURE_LEVEL_WEIGHTING_D = 3
BRICKLET_SOUND_PRESSURE_LEVEL_WEIGHTING_Z = 4
BRICKLET_SOUND_PRESSURE_LEVEL_WEIGHTING_ITU_R_468 = 5

procedure TBrickletSoundPressureLevel.GetConfiguration(out fftSize: byte; out weighting: byte)¶

Output Parameters:	fftSize – Type: byte, Range: See constants, Default: 3 weighting – Type: byte, Range: See constants, Default: 0

Returns the configuration as set by SetConfiguration.

The following constants are available for this function:

For fftSize:

BRICKLET_SOUND_PRESSURE_LEVEL_FFT_SIZE_128 = 0
BRICKLET_SOUND_PRESSURE_LEVEL_FFT_SIZE_256 = 1
BRICKLET_SOUND_PRESSURE_LEVEL_FFT_SIZE_512 = 2
BRICKLET_SOUND_PRESSURE_LEVEL_FFT_SIZE_1024 = 3

For weighting:

BRICKLET_SOUND_PRESSURE_LEVEL_WEIGHTING_A = 0
BRICKLET_SOUND_PRESSURE_LEVEL_WEIGHTING_B = 1
BRICKLET_SOUND_PRESSURE_LEVEL_WEIGHTING_C = 2
BRICKLET_SOUND_PRESSURE_LEVEL_WEIGHTING_D = 3
BRICKLET_SOUND_PRESSURE_LEVEL_WEIGHTING_Z = 4
BRICKLET_SOUND_PRESSURE_LEVEL_WEIGHTING_ITU_R_468 = 5

Advanced Functions¶

procedure TBrickletSoundPressureLevel.GetSPITFPErrorCount(out errorCountAckChecksum: longword; out errorCountMessageChecksum: longword; out errorCountFrame: longword; out errorCountOverflow: longword)¶

Output Parameters:	errorCountAckChecksum – Type: longword, Range: [0 to 2³² - 1] errorCountMessageChecksum – Type: longword, Range: [0 to 2³² - 1] errorCountFrame – Type: longword, Range: [0 to 2³² - 1] errorCountOverflow – Type: longword, Range: [0 to 2³² - 1]

Returns the error count for the communication between Brick and Bricklet.

The errors are divided into

ACK checksum errors,
message checksum errors,
framing errors and
overflow errors.

The errors counts are for errors that occur on the Bricklet side. All Bricks have a similar function that returns the errors on the Brick side.

procedure TBrickletSoundPressureLevel.SetStatusLEDConfig(const config: byte)¶

Parameters:	config – Type: byte, Range: See constants, Default: 3

Sets the status LED configuration. By default the LED shows communication traffic between Brick and Bricklet, it flickers once for every 10 received data packets.

You can also turn the LED permanently on/off or show a heartbeat.

If the Bricklet is in bootloader mode, the LED is will show heartbeat by default.

The following constants are available for this function:

For config:

BRICKLET_SOUND_PRESSURE_LEVEL_STATUS_LED_CONFIG_OFF = 0
BRICKLET_SOUND_PRESSURE_LEVEL_STATUS_LED_CONFIG_ON = 1
BRICKLET_SOUND_PRESSURE_LEVEL_STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
BRICKLET_SOUND_PRESSURE_LEVEL_STATUS_LED_CONFIG_SHOW_STATUS = 3

function TBrickletSoundPressureLevel.GetStatusLEDConfig: byte¶

Returns:	config – Type: byte, Range: See constants, Default: 3

Returns the configuration as set by SetStatusLEDConfig

The following constants are available for this function:

For config:

BRICKLET_SOUND_PRESSURE_LEVEL_STATUS_LED_CONFIG_OFF = 0
BRICKLET_SOUND_PRESSURE_LEVEL_STATUS_LED_CONFIG_ON = 1
BRICKLET_SOUND_PRESSURE_LEVEL_STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
BRICKLET_SOUND_PRESSURE_LEVEL_STATUS_LED_CONFIG_SHOW_STATUS = 3

function TBrickletSoundPressureLevel.GetChipTemperature: smallint¶

Returns:	temperature – Type: smallint, Unit: 1 °C, Range: [-2¹⁵ to 2¹⁵ - 1]

Returns the temperature as measured inside the microcontroller. The value returned is not the ambient temperature!

The temperature is only proportional to the real temperature and it has bad accuracy. Practically it is only useful as an indicator for temperature changes.

procedure TBrickletSoundPressureLevel.Reset¶

Calling this function will reset the Bricklet. All configurations will be lost.

After a reset you have to create new device objects, calling functions on the existing ones will result in undefined behavior!

procedure TBrickletSoundPressureLevel.GetIdentity(out uid: string; out connectedUid: string; out position: char; out hardwareVersion: array [0..2] of byte; out firmwareVersion: array [0..2] of byte; out deviceIdentifier: word)¶

Output Parameters:

Output Parameters:	uid – Type: string, Length: up to 8 connectedUid – Type: string, Length: up to 8 position – Type: char, Range: ['a' to 'h', 'z'] hardwareVersion – Type: array [0..2] of byte 0: major – Type: byte, Range: [0 to 255] 1: minor – Type: byte, Range: [0 to 255] 2: revision – Type: byte, Range: [0 to 255] firmwareVersion – Type: array [0..2] of byte 0: major – Type: byte, Range: [0 to 255] 1: minor – Type: byte, Range: [0 to 255] 2: revision – Type: byte, Range: [0 to 255] deviceIdentifier – Type: word, Range: [0 to 2¹⁶ - 1]

uid – Type: string, Length: up to 8
connectedUid – Type: string, Length: up to 8
position – Type: char, Range: ['a' to 'h', 'z']
hardwareVersion – Type: array [0..2] of byte

0: major – Type: byte, Range: [0 to 255]
1: minor – Type: byte, Range: [0 to 255]
2: revision – Type: byte, Range: [0 to 255]

firmwareVersion – Type: array [0..2] of byte

0: major – Type: byte, Range: [0 to 255]
1: minor – Type: byte, Range: [0 to 255]
2: revision – Type: byte, Range: [0 to 255]

deviceIdentifier – Type: word, Range: [0 to 2¹⁶ - 1]

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c', 'd', 'e', 'f', 'g' or 'h' (Bricklet Port). A Bricklet connected to an Isolator Bricklet is always at position 'z'.

The device identifier numbers can be found here. There is also a constant for the device identifier of this Bricklet.

Callback Configuration Functions¶

procedure TBrickletSoundPressureLevel.SetDecibelCallbackConfiguration(const period: longword; const valueHasToChange: boolean; const option: char; const min: word; const max: word)¶

Parameters:	period – Type: longword, Unit: 1 ms, Range: [0 to 2³² - 1], Default: 0 valueHasToChange – Type: boolean, Default: false option – Type: char, Range: See constants, Default: 'x' min – Type: word, Unit: 1/10 dB, Range: [0 to 2¹⁶ - 1], Default: 0 max – Type: word, Unit: 1/10 dB, Range: [0 to 2¹⁶ - 1], Default: 0

The period is the period with which the OnDecibel callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after the value has changed. If the value didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

It is furthermore possible to constrain the callback with thresholds.

The option-parameter together with min/max sets a threshold for the OnDecibel callback.

The following options are possible:

Option	Description
'x'	Threshold is turned off
'o'	Threshold is triggered when the value is outside the min and max values
'i'	Threshold is triggered when the value is inside or equal to the min and max values
'<'	Threshold is triggered when the value is smaller than the min value (max is ignored)
'>'	Threshold is triggered when the value is greater than the min value (max is ignored)

If the option is set to 'x' (threshold turned off) the callback is triggered with the fixed period.

The following constants are available for this function:

For option:

BRICKLET_SOUND_PRESSURE_LEVEL_THRESHOLD_OPTION_OFF = 'x'
BRICKLET_SOUND_PRESSURE_LEVEL_THRESHOLD_OPTION_OUTSIDE = 'o'
BRICKLET_SOUND_PRESSURE_LEVEL_THRESHOLD_OPTION_INSIDE = 'i'
BRICKLET_SOUND_PRESSURE_LEVEL_THRESHOLD_OPTION_SMALLER = '<'
BRICKLET_SOUND_PRESSURE_LEVEL_THRESHOLD_OPTION_GREATER = '>'

procedure TBrickletSoundPressureLevel.GetDecibelCallbackConfiguration(out period: longword; out valueHasToChange: boolean; out option: char; out min: word; out max: word)¶

Output Parameters:	period – Type: longword, Unit: 1 ms, Range: [0 to 2³² - 1], Default: 0 valueHasToChange – Type: boolean, Default: false option – Type: char, Range: See constants, Default: 'x' min – Type: word, Unit: 1/10 dB, Range: [0 to 2¹⁶ - 1], Default: 0 max – Type: word, Unit: 1/10 dB, Range: [0 to 2¹⁶ - 1], Default: 0

Returns the callback configuration as set by SetDecibelCallbackConfiguration.

The following constants are available for this function:

For option:

BRICKLET_SOUND_PRESSURE_LEVEL_THRESHOLD_OPTION_OFF = 'x'
BRICKLET_SOUND_PRESSURE_LEVEL_THRESHOLD_OPTION_OUTSIDE = 'o'
BRICKLET_SOUND_PRESSURE_LEVEL_THRESHOLD_OPTION_INSIDE = 'i'
BRICKLET_SOUND_PRESSURE_LEVEL_THRESHOLD_OPTION_SMALLER = '<'
BRICKLET_SOUND_PRESSURE_LEVEL_THRESHOLD_OPTION_GREATER = '>'

procedure TBrickletSoundPressureLevel.SetSpectrumCallbackConfiguration(const period: longword)¶

Parameters:	period – Type: longword, Unit: 1 ms, Range: [0 to 2³² - 1], Default: 0

The period is the period with which the OnSpectrum callback is triggered periodically. A value of 0 turns the callback off.

Every new measured spectrum will be send at most once. Set the period to 1 to make sure that you get every spectrum.

function TBrickletSoundPressureLevel.GetSpectrumCallbackConfiguration: longword¶

Returns:	period – Type: longword, Unit: 1 ms, Range: [0 to 2³² - 1], Default: 0

Returns the callback configuration as set by GetSpectrumCallbackConfiguration.

Callbacks¶

Callbacks can be registered to receive time critical or recurring data from the device. The registration is done by assigning a procedure to an callback property of the device object:

procedure TExample.MyCallback(sender: TBrickletSoundPressureLevel; const value: longint);
begin
  WriteLn(Format('Value: %d', [value]));
end;

soundPressureLevel.OnExample := {$ifdef FPC}@{$endif}example.MyCallback;

The available callback properties and their parameter types are described below.

Note

Using callbacks for recurring events is always preferred compared to using getters. It will use less USB bandwidth and the latency will be a lot better, since there is no round trip time.

property TBrickletSoundPressureLevel.OnDecibel¶

procedure(sender: TBrickletSoundPressureLevel; const decibel: word) of object;

Callback Parameters:	sender – Type: TBrickletSoundPressureLevel decibel – Type: word, Unit: 1/10 dB, Range: [0 to 120]

This callback is triggered periodically according to the configuration set by SetDecibelCallbackConfiguration.

The parameter is the same as GetDecibel.

property TBrickletSoundPressureLevel.OnSpectrum¶

procedure(sender: TBrickletSoundPressureLevel; const spectrum: array of word) of object;

Callback Parameters:	sender – Type: TBrickletSoundPressureLevel spectrum – Type: array of word, Unit: ? dB, Range: [0 to 2¹⁶ - 1]

This callback is triggered periodically according to the configuration set by SetSpectrumCallbackConfiguration.

The parameter is the same as GetSpectrum.

Note

If reconstructing the value fails, the callback is triggered with nil for spectrum.

Virtual Functions¶

Virtual functions don't communicate with the device itself, but operate only on the API bindings device object. They can be called without the corresponding IP Connection object being connected.

function TBrickletSoundPressureLevel.GetAPIVersion: array [0..2] of byte¶

Output Parameters:	apiVersion – Type: array [0..2] of byte 0: major – Type: byte, Range: [0 to 255] 1: minor – Type: byte, Range: [0 to 255] 2: revision – Type: byte, Range: [0 to 255]

Returns the version of the API definition implemented by this API bindings. This is neither the release version of this API bindings nor does it tell you anything about the represented Brick or Bricklet.

function TBrickletSoundPressureLevel.GetResponseExpected(const functionId: byte): boolean¶

Parameters:	functionId – Type: byte, Range: See constants
Returns:	responseExpected – Type: boolean

Returns the response expected flag for the function specified by the function ID parameter. It is true if the function is expected to send a response, false otherwise.

For getter functions this is enabled by default and cannot be disabled, because those functions will always send a response. For callback configuration functions it is enabled by default too, but can be disabled by SetResponseExpected. For setter functions it is disabled by default and can be enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For functionId:

BRICKLET_SOUND_PRESSURE_LEVEL_FUNCTION_SET_DECIBEL_CALLBACK_CONFIGURATION = 2
BRICKLET_SOUND_PRESSURE_LEVEL_FUNCTION_SET_SPECTRUM_CALLBACK_CONFIGURATION = 6
BRICKLET_SOUND_PRESSURE_LEVEL_FUNCTION_SET_CONFIGURATION = 9
BRICKLET_SOUND_PRESSURE_LEVEL_FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
BRICKLET_SOUND_PRESSURE_LEVEL_FUNCTION_SET_STATUS_LED_CONFIG = 239
BRICKLET_SOUND_PRESSURE_LEVEL_FUNCTION_RESET = 243
BRICKLET_SOUND_PRESSURE_LEVEL_FUNCTION_WRITE_UID = 248

procedure TBrickletSoundPressureLevel.SetResponseExpected(const functionId: byte; const responseExpected: boolean)¶

Parameters:	functionId – Type: byte, Range: See constants responseExpected – Type: boolean

Changes the response expected flag of the function specified by the function ID parameter. This flag can only be changed for setter (default value: false) and callback configuration functions (default value: true). For getter functions it is always enabled.

The following constants are available for this function:

For functionId:

BRICKLET_SOUND_PRESSURE_LEVEL_FUNCTION_SET_DECIBEL_CALLBACK_CONFIGURATION = 2
BRICKLET_SOUND_PRESSURE_LEVEL_FUNCTION_SET_SPECTRUM_CALLBACK_CONFIGURATION = 6
BRICKLET_SOUND_PRESSURE_LEVEL_FUNCTION_SET_CONFIGURATION = 9
BRICKLET_SOUND_PRESSURE_LEVEL_FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
BRICKLET_SOUND_PRESSURE_LEVEL_FUNCTION_SET_STATUS_LED_CONFIG = 239
BRICKLET_SOUND_PRESSURE_LEVEL_FUNCTION_RESET = 243
BRICKLET_SOUND_PRESSURE_LEVEL_FUNCTION_WRITE_UID = 248

procedure TBrickletSoundPressureLevel.SetResponseExpectedAll(const responseExpected: boolean)¶

Parameters:	responseExpected – Type: boolean

Changes the response expected flag for all setter and callback configuration functions of this device at once.

Internal Functions¶

Internal functions are used for maintenance tasks such as flashing a new firmware of changing the UID of a Bricklet. These task should be performed using Brick Viewer instead of using the internal functions directly.

function TBrickletSoundPressureLevel.SetBootloaderMode(const mode: byte): byte¶

Parameters:	mode – Type: byte, Range: See constants
Returns:	status – Type: byte, Range: See constants

Sets the bootloader mode and returns the status after the requested mode change was instigated.

You can change from bootloader mode to firmware mode and vice versa. A change from bootloader mode to firmware mode will only take place if the entry function, device identifier and CRC are present and correct.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

The following constants are available for this function:

For mode:

BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_MODE_BOOTLOADER = 0
BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_MODE_FIRMWARE = 1
BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4

For status:

BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_STATUS_OK = 0
BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_STATUS_INVALID_MODE = 1
BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_STATUS_NO_CHANGE = 2
BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_STATUS_ENTRY_FUNCTION_NOT_PRESENT = 3
BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_STATUS_DEVICE_IDENTIFIER_INCORRECT = 4
BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_STATUS_CRC_MISMATCH = 5

function TBrickletSoundPressureLevel.GetBootloaderMode: byte¶

Returns:	mode – Type: byte, Range: See constants

Returns the current bootloader mode, see SetBootloaderMode.

The following constants are available for this function:

For mode:

BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_MODE_BOOTLOADER = 0
BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_MODE_FIRMWARE = 1
BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
BRICKLET_SOUND_PRESSURE_LEVEL_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4

procedure TBrickletSoundPressureLevel.SetWriteFirmwarePointer(const pointer: longword)¶

Parameters:	pointer – Type: longword, Unit: 1 B, Range: [0 to 2³² - 1]

Sets the firmware pointer for WriteFirmware. The pointer has to be increased by chunks of size 64. The data is written to flash every 4 chunks (which equals to one page of size 256).

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

function TBrickletSoundPressureLevel.WriteFirmware(const data: array [0..63] of byte): byte¶

Parameters:	data – Type: array [0..63] of byte, Range: [0 to 255]
Returns:	status – Type: byte, Range: [0 to 255]

Writes 64 Bytes of firmware at the position as written by SetWriteFirmwarePointer before. The firmware is written to flash every 4 chunks.

You can only write firmware in bootloader mode.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

procedure TBrickletSoundPressureLevel.WriteUID(const uid: longword)¶

Parameters:	uid – Type: longword, Range: [0 to 2³² - 1]

Writes a new UID into flash. If you want to set a new UID you have to decode the Base58 encoded UID string into an integer first.

We recommend that you use Brick Viewer to change the UID.

function TBrickletSoundPressureLevel.ReadUID: longword¶

Returns:	uid – Type: longword, Range: [0 to 2³² - 1]

Returns the current UID as an integer. Encode as Base58 to get the usual string version.

Constants¶

const BRICKLET_SOUND_PRESSURE_LEVEL_DEVICE_IDENTIFIER¶

This constant is used to identify a Sound Pressure Level Bricklet.

The GetIdentity function and the TIPConnection.OnEnumerate callback of the IP Connection have a deviceIdentifier parameter to specify the Brick's or Bricklet's type.

const BRICKLET_SOUND_PRESSURE_LEVEL_DEVICE_DISPLAY_NAME¶: This constant represents the human readable name of a Sound Pressure Level Bricklet.