Delphi/Lazarus - PTC Bricklet 2.0

This is the description of the Delphi/Lazarus API bindings for the PTC Bricklet 2.0. General information and technical specifications for the PTC Bricklet 2.0 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)

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program ExampleSimple;

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

uses
  SysUtils, IPConnection, BrickletPTCV2;

type
  TExample = class
  private
    ipcon: TIPConnection;
    ptc: TBrickletPTCV2;
  public
    procedure Execute;
  end;

const
  HOST = 'localhost';
  PORT = 4223;
  UID = 'XYZ'; { Change XYZ to the UID of your PTC Bricklet 2.0 }

var
  e: TExample;

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

  { Create device object }
  ptc := TBrickletPTCV2.Create(UID, ipcon);

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

  { Get current temperature }
  temperature := ptc.GetTemperature;
  WriteLn(Format('Temperature: %f °C', [temperature/100.0]));

  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)

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program ExampleCallback;

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

uses
  SysUtils, IPConnection, BrickletPTCV2;

type
  TExample = class
  private
    ipcon: TIPConnection;
    ptc: TBrickletPTCV2;
  public
    procedure TemperatureCB(sender: TBrickletPTCV2; const temperature: longint);
    procedure Execute;
  end;

const
  HOST = 'localhost';
  PORT = 4223;
  UID = 'XYZ'; { Change XYZ to the UID of your PTC Bricklet 2.0 }

var
  e: TExample;

{ Callback procedure for temperature callback }
procedure TExample.TemperatureCB(sender: TBrickletPTCV2; const temperature: longint);
begin
  WriteLn(Format('Temperature: %f °C', [temperature/100.0]));
end;

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

  { Create device object }
  ptc := TBrickletPTCV2.Create(UID, ipcon);

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

  { Register temperature callback to procedure TemperatureCB }
  ptc.OnTemperature := {$ifdef FPC}@{$endif}TemperatureCB;

  { Set period for temperature callback to 1s (1000ms) without a threshold }
  ptc.SetTemperatureCallbackConfiguration(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)

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program ExampleThreshold;

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

uses
  SysUtils, IPConnection, BrickletPTCV2;

type
  TExample = class
  private
    ipcon: TIPConnection;
    ptc: TBrickletPTCV2;
  public
    procedure TemperatureCB(sender: TBrickletPTCV2; const temperature: longint);
    procedure Execute;
  end;

const
  HOST = 'localhost';
  PORT = 4223;
  UID = 'XYZ'; { Change XYZ to the UID of your PTC Bricklet 2.0 }

var
  e: TExample;

{ Callback procedure for temperature callback }
procedure TExample.TemperatureCB(sender: TBrickletPTCV2; const temperature: longint);
begin
  WriteLn(Format('Temperature: %f °C', [temperature/100.0]));
end;

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

  { Create device object }
  ptc := TBrickletPTCV2.Create(UID, ipcon);

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

  { Register temperature callback to procedure TemperatureCB }
  ptc.OnTemperature := {$ifdef FPC}@{$endif}TemperatureCB;

  { Configure threshold for temperature "greater than 30 °C"
    with a debounce period of 1s (1000ms) }
  ptc.SetTemperatureCallbackConfiguration(1000, false, '>', 30*100, 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 TBrickletPTCV2.Create(const uid: string; ipcon: TIPConnection)

Creates an object with the unique device ID uid:

ptcV2 := TBrickletPTCV2.Create('YOUR_DEVICE_UID', ipcon);

This object can then be used after the IP Connection is connected (see examples above).

function TBrickletPTCV2.GetTemperature: longint

Returns the temperature of the connected sensor. The value has a range of -246 to 849 °C and is given in °C/100, e.g. a value of 4223 means that a temperature of 42.23 °C is measured.

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

function TBrickletPTCV2.GetResistance: longint

Returns the value as measured by the MAX31865 precision delta-sigma ADC.

The value can be converted with the following formulas:

  • Pt100: resistance = (value * 390) / 32768
  • Pt1000: resistance = (value * 3900) / 32768

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

function TBrickletPTCV2.IsSensorConnected: boolean

Returns true if the sensor is connected correctly.

If this function returns false, there is either no Pt100 or Pt1000 sensor connected, the sensor is connected incorrectly or the sensor itself is faulty.

If you want to get the status automatically, it is recommended to use the OnSensorConnected callback. You can set the callback configuration with SetSensorConnectedCallbackConfiguration.

procedure TBrickletPTCV2.SetWireMode(const mode: byte)

Sets the wire mode of the sensor. Possible values are 2, 3 and 4 which correspond to 2-, 3- and 4-wire sensors. The value has to match the jumper configuration on the Bricklet.

The default value is 2 = 2-wire.

The following constants are available for this function:

  • BRICKLET_PTC_V2_WIRE_MODE_2 = 2
  • BRICKLET_PTC_V2_WIRE_MODE_3 = 3
  • BRICKLET_PTC_V2_WIRE_MODE_4 = 4
function TBrickletPTCV2.GetWireMode: byte

Returns the wire mode as set by SetWireMode

The following constants are available for this function:

  • BRICKLET_PTC_V2_WIRE_MODE_2 = 2
  • BRICKLET_PTC_V2_WIRE_MODE_3 = 3
  • BRICKLET_PTC_V2_WIRE_MODE_4 = 4
procedure TBrickletPTCV2.SetMovingAverageConfiguration(const movingAverageLengthResistance: word; const movingAverageLengthTemperature: word)

Sets the length of a moving averaging for the resistance and temperature.

Setting the length to 1 will turn the averaging off. With less averaging, there is more noise on the data.

The range for the averaging is 1-1000.

New data is gathered every 20ms. With a moving average of length 1000 the resulting averaging window has a length of 20s. If you want to do long term measurements the longest moving average will give the cleanest results.

The default value is 1 for resistance and 40 for temperature. The default values match the non-changeable averaging settings of the old PTC Bricklet 1.0

procedure TBrickletPTCV2.GetMovingAverageConfiguration(out movingAverageLengthResistance: word; out movingAverageLengthTemperature: word)

Returns the moving average configuration as set by SetMovingAverageConfiguration.

Advanced Functions

procedure TBrickletPTCV2.SetNoiseRejectionFilter(const filter: byte)

Sets the noise rejection filter to either 50Hz (0) or 60Hz (1). Noise from 50Hz or 60Hz power sources (including harmonics of the AC power's fundamental frequency) is attenuated by 82dB.

Default value is 0 = 50Hz.

The following constants are available for this function:

  • BRICKLET_PTC_V2_FILTER_OPTION_50HZ = 0
  • BRICKLET_PTC_V2_FILTER_OPTION_60HZ = 1
function TBrickletPTCV2.GetNoiseRejectionFilter: byte

Returns the noise rejection filter option as set by SetNoiseRejectionFilter

The following constants are available for this function:

  • BRICKLET_PTC_V2_FILTER_OPTION_50HZ = 0
  • BRICKLET_PTC_V2_FILTER_OPTION_60HZ = 1
function TBrickletPTCV2.GetAPIVersion: array [0..2] of byte

Returns the version of the API definition (major, minor, revision) 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 TBrickletPTCV2.GetResponseExpected(const functionId: byte): 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 send and errors are silently ignored, because they cannot be detected.

See SetResponseExpected for the list of function ID constants available for this function.

procedure TBrickletPTCV2.SetResponseExpected(const functionId: byte; const responseExpected: 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.

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 send and errors are silently ignored, because they cannot be detected.

The following function ID constants are available for this function:

  • BRICKLET_PTC_V2_FUNCTION_SET_TEMPERATURE_CALLBACK_CONFIGURATION = 2
  • BRICKLET_PTC_V2_FUNCTION_SET_RESISTANCE_CALLBACK_CONFIGURATION = 6
  • BRICKLET_PTC_V2_FUNCTION_SET_NOISE_REJECTION_FILTER = 9
  • BRICKLET_PTC_V2_FUNCTION_SET_WIRE_MODE = 12
  • BRICKLET_PTC_V2_FUNCTION_SET_MOVING_AVERAGE_CONFIGURATION = 14
  • BRICKLET_PTC_V2_FUNCTION_SET_SENSOR_CONNECTED_CALLBACK_CONFIGURATION = 16
  • BRICKLET_PTC_V2_FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
  • BRICKLET_PTC_V2_FUNCTION_SET_STATUS_LED_CONFIG = 239
  • BRICKLET_PTC_V2_FUNCTION_RESET = 243
  • BRICKLET_PTC_V2_FUNCTION_WRITE_UID = 248
procedure TBrickletPTCV2.SetResponseExpectedAll(const responseExpected: boolean)

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

procedure TBrickletPTCV2.GetSPITFPErrorCount(out errorCountAckChecksum: longword; out errorCountMessageChecksum: longword; out errorCountFrame: longword; out errorCountOverflow: longword)

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.

function TBrickletPTCV2.SetBootloaderMode(const mode: byte): byte

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:

  • BRICKLET_PTC_V2_BOOTLOADER_MODE_BOOTLOADER = 0
  • BRICKLET_PTC_V2_BOOTLOADER_MODE_FIRMWARE = 1
  • BRICKLET_PTC_V2_BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
  • BRICKLET_PTC_V2_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
  • BRICKLET_PTC_V2_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4
  • BRICKLET_PTC_V2_BOOTLOADER_STATUS_OK = 0
  • BRICKLET_PTC_V2_BOOTLOADER_STATUS_INVALID_MODE = 1
  • BRICKLET_PTC_V2_BOOTLOADER_STATUS_NO_CHANGE = 2
  • BRICKLET_PTC_V2_BOOTLOADER_STATUS_ENTRY_FUNCTION_NOT_PRESENT = 3
  • BRICKLET_PTC_V2_BOOTLOADER_STATUS_DEVICE_IDENTIFIER_INCORRECT = 4
  • BRICKLET_PTC_V2_BOOTLOADER_STATUS_CRC_MISMATCH = 5
function TBrickletPTCV2.GetBootloaderMode: byte

Returns the current bootloader mode, see SetBootloaderMode.

The following constants are available for this function:

  • BRICKLET_PTC_V2_BOOTLOADER_MODE_BOOTLOADER = 0
  • BRICKLET_PTC_V2_BOOTLOADER_MODE_FIRMWARE = 1
  • BRICKLET_PTC_V2_BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
  • BRICKLET_PTC_V2_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
  • BRICKLET_PTC_V2_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4
procedure TBrickletPTCV2.SetWriteFirmwarePointer(const pointer: longword)

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 TBrickletPTCV2.WriteFirmware(const data: array [0..63] of byte): byte

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 TBrickletPTCV2.SetStatusLEDConfig(const config: byte)

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:

  • BRICKLET_PTC_V2_STATUS_LED_CONFIG_OFF = 0
  • BRICKLET_PTC_V2_STATUS_LED_CONFIG_ON = 1
  • BRICKLET_PTC_V2_STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
  • BRICKLET_PTC_V2_STATUS_LED_CONFIG_SHOW_STATUS = 3
function TBrickletPTCV2.GetStatusLEDConfig: byte

Returns the configuration as set by SetStatusLEDConfig

The following constants are available for this function:

  • BRICKLET_PTC_V2_STATUS_LED_CONFIG_OFF = 0
  • BRICKLET_PTC_V2_STATUS_LED_CONFIG_ON = 1
  • BRICKLET_PTC_V2_STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
  • BRICKLET_PTC_V2_STATUS_LED_CONFIG_SHOW_STATUS = 3
function TBrickletPTCV2.GetChipTemperature: smallint

Returns the temperature in °C 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 TBrickletPTCV2.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 TBrickletPTCV2.WriteUID(const uid: longword)

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 TBrickletPTCV2.ReadUID: longword

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

procedure TBrickletPTCV2.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)

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' or 'd'.

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

Callback Configuration Functions

procedure TBrickletPTCV2.SetTemperatureCallbackConfiguration(const period: longword; const valueHasToChange: boolean; const option: char; const min: longint; const max: longint)

The period in ms is the period with which the OnTemperature 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 OnTemperature 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 default value is (0, false, 'x', 0, 0).

The following constants are available for this function:

  • BRICKLET_PTC_V2_THRESHOLD_OPTION_OFF = 'x'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_OUTSIDE = 'o'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_INSIDE = 'i'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_SMALLER = '<'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_GREATER = '>'
procedure TBrickletPTCV2.GetTemperatureCallbackConfiguration(out period: longword; out valueHasToChange: boolean; out option: char; out min: longint; out max: longint)

Returns the callback configuration as set by SetTemperatureCallbackConfiguration.

The following constants are available for this function:

  • BRICKLET_PTC_V2_THRESHOLD_OPTION_OFF = 'x'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_OUTSIDE = 'o'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_INSIDE = 'i'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_SMALLER = '<'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_GREATER = '>'
procedure TBrickletPTCV2.SetResistanceCallbackConfiguration(const period: longword; const valueHasToChange: boolean; const option: char; const min: longint; const max: longint)

The period in ms is the period with which the OnResistance 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 OnResistance 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 default value is (0, false, 'x', 0, 0).

The following constants are available for this function:

  • BRICKLET_PTC_V2_THRESHOLD_OPTION_OFF = 'x'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_OUTSIDE = 'o'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_INSIDE = 'i'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_SMALLER = '<'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_GREATER = '>'
procedure TBrickletPTCV2.GetResistanceCallbackConfiguration(out period: longword; out valueHasToChange: boolean; out option: char; out min: longint; out max: longint)

Returns the callback configuration as set by SetResistanceCallbackConfiguration.

The following constants are available for this function:

  • BRICKLET_PTC_V2_THRESHOLD_OPTION_OFF = 'x'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_OUTSIDE = 'o'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_INSIDE = 'i'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_SMALLER = '<'
  • BRICKLET_PTC_V2_THRESHOLD_OPTION_GREATER = '>'
procedure TBrickletPTCV2.SetSensorConnectedCallbackConfiguration(const enabled: boolean)

If you enable this callback, the OnSensorConnected callback is triggered every time a Pt sensor is connected/disconnected.

By default this callback is disabled.

function TBrickletPTCV2.GetSensorConnectedCallbackConfiguration: boolean

Returns the configuration as set by SetSensorConnectedCallbackConfiguration.

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: TBrickletPTCV2; const param: word);
begin
  WriteLn(param);
end;

ptcV2.OnExample := {$ifdef FPC}@{$endif}example.MyCallback;

The available callback property and their type of parameters 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 TBrickletPTCV2.OnTemperature
procedure(sender: TBrickletPTCV2; const temperature: longint) of object;

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

The parameter is the same as GetTemperature.

property TBrickletPTCV2.OnResistance
procedure(sender: TBrickletPTCV2; const resistance: longint) of object;

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

The parameter is the same as GetResistance.

property TBrickletPTCV2.OnSensorConnected
procedure(sender: TBrickletPTCV2; const connected: boolean) of object;

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

The parameter is the same as IsSensorConnected.

Constants

const BRICKLET_PTC_V2_DEVICE_IDENTIFIER

This constant is used to identify a PTC Bricklet 2.0.

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

const BRICKLET_PTC_V2_DEVICE_DISPLAY_NAME

This constant represents the human readable name of a PTC Bricklet 2.0.