Java - Joystick Bricklet 2.0¶

Simple¶

Download (ExampleSimple.java)

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import com.tinkerforge.IPConnection;
import com.tinkerforge.BrickletJoystickV2;
import com.tinkerforge.BrickletJoystickV2.Position;

public class ExampleSimple {
    private static final String HOST = "localhost";
    private static final int PORT = 4223;

    // Change XYZ to the UID of your Joystick Bricklet 2.0
    private static final String UID = "XYZ";

    // Note: To make the example code cleaner we do not handle exceptions. Exceptions
    //       you might normally want to catch are described in the documentation
    public static void main(String args[]) throws Exception {
        IPConnection ipcon = new IPConnection(); // Create IP connection
        BrickletJoystickV2 j = new BrickletJoystickV2(UID, ipcon); // Create device object

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

        // Get current position
        Position position = j.getPosition(); // Can throw com.tinkerforge.TimeoutException

        System.out.println("Position [X]: " + position.x);
        System.out.println("Position [Y]: " + position.y);

        System.out.println("Press key to exit"); System.in.read();
        ipcon.disconnect();
    }
}

Callback¶

Download (ExampleCallback.java)

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import com.tinkerforge.IPConnection;
import com.tinkerforge.BrickletJoystickV2;

public class ExampleCallback {
    private static final String HOST = "localhost";
    private static final int PORT = 4223;

    // Change XYZ to the UID of your Joystick Bricklet 2.0
    private static final String UID = "XYZ";

    // Note: To make the example code cleaner we do not handle exceptions. Exceptions
    //       you might normally want to catch are described in the documentation
    public static void main(String args[]) throws Exception {
        IPConnection ipcon = new IPConnection(); // Create IP connection
        BrickletJoystickV2 j = new BrickletJoystickV2(UID, ipcon); // Create device object

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

        // Add pressed listener
        j.addPressedListener(new BrickletJoystickV2.PressedListener() {
            public void pressed(boolean pressed) {
                System.out.println("Pressed: " + pressed);
            }
        });

        // Set period for pressed callback to 0.01s (10ms)
        j.setPressedCallbackConfiguration(10, true);

        System.out.println("Press key to exit"); System.in.read();
        ipcon.disconnect();
    }
}

Basic Functions¶

class BrickletJoystickV2(String uid, IPConnection ipcon)¶

Parameters:	uid – Type: String ipcon – Type: IPConnection
Returns:	joystickV2 – Type: BrickletJoystickV2

Creates an object with the unique device ID uid:

BrickletJoystickV2 joystickV2 = new BrickletJoystickV2("YOUR_DEVICE_UID", ipcon);

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

BrickletJoystickV2.Position BrickletJoystickV2.getPosition()¶

Return Object:	x – Type: int, Range: [-100 to 100] y – Type: int, Range: [-100 to 100]

Returns the position of the joystick. The middle position of the joystick is x=0, y=0. The returned values are averaged and calibrated (see calibrate()).

If you want to get the position periodically, it is recommended to use the PositionListener listener and set the period with setPositionCallbackConfiguration().

boolean BrickletJoystickV2.isPressed()¶

Returns:	pressed – Type: boolean

Returns true if the button is pressed and false otherwise.

If you want to get the press-state periodically, it is recommended to use the PressedListener listener and set the period with setPressedCallbackConfiguration().

Advanced Functions¶

void BrickletJoystickV2.calibrate()¶

Calibrates the middle position of the joystick. If your Joystick Bricklet 2.0 does not return x=0 and y=0 in the middle position, call this function while the joystick is standing still in the middle position.

The resulting calibration will be saved in non-volatile memory, thus you only have to calibrate it once.

BrickletJoystickV2.SPITFPErrorCount BrickletJoystickV2.getSPITFPErrorCount()¶

Return Object:	errorCountAckChecksum – Type: long, Range: [0 to 232 - 1] errorCountMessageChecksum – Type: long, Range: [0 to 232 - 1] errorCountFrame – Type: long, Range: [0 to 232 - 1] errorCountOverflow – Type: long, 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.

void BrickletJoystickV2.setStatusLEDConfig(int config)¶

Parameters:	config – Type: int, 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:

• BrickletJoystickV2.STATUS_LED_CONFIG_OFF = 0
• BrickletJoystickV2.STATUS_LED_CONFIG_ON = 1
• BrickletJoystickV2.STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
• BrickletJoystickV2.STATUS_LED_CONFIG_SHOW_STATUS = 3

int BrickletJoystickV2.getStatusLEDConfig()¶

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

Returns the configuration as set by setStatusLEDConfig()

The following constants are available for this function:

For config:

• BrickletJoystickV2.STATUS_LED_CONFIG_OFF = 0
• BrickletJoystickV2.STATUS_LED_CONFIG_ON = 1
• BrickletJoystickV2.STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
• BrickletJoystickV2.STATUS_LED_CONFIG_SHOW_STATUS = 3

int BrickletJoystickV2.getChipTemperature()¶

Returns:	temperature – Type: int, 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.

void BrickletJoystickV2.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!

BrickletJoystickV2.Identity BrickletJoystickV2.getIdentity()¶

Return Object:

uid – Type: String, Length: up to 8 connectedUid – Type: String, Length: up to 8 position – Type: char, Range: ['a' to 'h', 'z'] hardwareVersion – Type: short[], Length: 3 0: major – Type: short, Range: [0 to 255] 1: minor – Type: short, Range: [0 to 255] 2: revision – Type: short, Range: [0 to 255] firmwareVersion – Type: short[], Length: 3 0: major – Type: short, Range: [0 to 255] 1: minor – Type: short, Range: [0 to 255] 2: revision – Type: short, Range: [0 to 255] deviceIdentifier – Type: int, 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.

Listener Configuration Functions¶

void BrickletJoystickV2.setPositionCallbackConfiguration(long period, boolean valueHasToChange)¶

Parameters:	period – Type: long, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 valueHasToChange – Type: boolean, Default: false

The period is the period with which the PositionListener listener is triggered periodically. A value of 0 turns the listener off.

If the value has to change-parameter is set to true, the listener is only triggered after at least one of the values has changed. If the values didn't change within the period, the listener is triggered immediately on change.

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

BrickletJoystickV2.PositionCallbackConfiguration BrickletJoystickV2.getPositionCallbackConfiguration()¶

Return Object:	period – Type: long, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 valueHasToChange – Type: boolean, Default: false

Returns the listener configuration as set by setPositionCallbackConfiguration().

void BrickletJoystickV2.setPressedCallbackConfiguration(long period, boolean valueHasToChange)¶

Parameters:	period – Type: long, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 valueHasToChange – Type: boolean, Default: false

The period is the period with which the PressedListener listener is triggered periodically. A value of 0 turns the listener off.

If the value has to change-parameter is set to true, the listener is only triggered after at least one of the values has changed. If the values didn't change within the period, the listener is triggered immediately on change.

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

BrickletJoystickV2.PressedCallbackConfiguration BrickletJoystickV2.getPressedCallbackConfiguration()¶

Return Object:	period – Type: long, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 valueHasToChange – Type: boolean, Default: false

Returns the listener configuration as set by setPressedCallbackConfiguration().

Listeners¶

Listeners can be registered to receive time critical or recurring data from the device. The registration is done with add*Listener() functions of the device object.

The parameter is a listener class object, for example:

device.addExampleListener(new BrickletJoystickV2.ExampleListener() {
    public void property(int value) {
        System.out.println("Value: " + value);
    }
});

The available listener classes with inherent methods to be overwritten are described below. It is possible to add several listeners and to remove them with the corresponding remove*Listener() function.

class BrickletJoystickV2.PositionListener()¶

This listener can be added with the addPositionListener() function. An added listener can be removed with the removePositionListener() function.

void position(int x, int y)

Parameters:	x – Type: int, Range: [-100 to 100] y – Type: int, Range: [-100 to 100]

This listener is triggered periodically according to the configuration set by setPositionCallbackConfiguration().

The parameters are the same as with getPosition().

class BrickletJoystickV2.PressedListener()¶

This listener can be added with the addPressedListener() function. An added listener can be removed with the removePressedListener() function.

void pressed(boolean pressed)

Parameters:	pressed – Type: boolean

This listener is triggered periodically according to the configuration set by setPressedCallbackConfiguration().

The parameters are the same as with isPressed().

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.

short[] BrickletJoystickV2.getAPIVersion()¶

Return Object:	apiVersion – Type: short[], Length: 3 0: major – Type: short, Range: [0 to 255] 1: minor – Type: short, Range: [0 to 255] 2: revision – Type: short, 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.

boolean BrickletJoystickV2.getResponseExpected(byte functionId)¶

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 listener 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:

• BrickletJoystickV2.FUNCTION_CALIBRATE = 3
• BrickletJoystickV2.FUNCTION_SET_POSITION_CALLBACK_CONFIGURATION = 4
• BrickletJoystickV2.FUNCTION_SET_PRESSED_CALLBACK_CONFIGURATION = 7
• BrickletJoystickV2.FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
• BrickletJoystickV2.FUNCTION_SET_STATUS_LED_CONFIG = 239
• BrickletJoystickV2.FUNCTION_RESET = 243
• BrickletJoystickV2.FUNCTION_WRITE_UID = 248

void BrickletJoystickV2.setResponseExpected(byte functionId, boolean responseExpected)¶

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

The following constants are available for this function:

For functionId:

• BrickletJoystickV2.FUNCTION_CALIBRATE = 3
• BrickletJoystickV2.FUNCTION_SET_POSITION_CALLBACK_CONFIGURATION = 4
• BrickletJoystickV2.FUNCTION_SET_PRESSED_CALLBACK_CONFIGURATION = 7
• BrickletJoystickV2.FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
• BrickletJoystickV2.FUNCTION_SET_STATUS_LED_CONFIG = 239
• BrickletJoystickV2.FUNCTION_RESET = 243
• BrickletJoystickV2.FUNCTION_WRITE_UID = 248

void BrickletJoystickV2.setResponseExpectedAll(boolean responseExpected)¶

Parameters:	responseExpected – Type: boolean

Changes the response expected flag for all setter and listener 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.

int BrickletJoystickV2.setBootloaderMode(int mode)¶

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

• BrickletJoystickV2.BOOTLOADER_MODE_BOOTLOADER = 0
• BrickletJoystickV2.BOOTLOADER_MODE_FIRMWARE = 1
• BrickletJoystickV2.BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
• BrickletJoystickV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
• BrickletJoystickV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4

For status:

• BrickletJoystickV2.BOOTLOADER_STATUS_OK = 0
• BrickletJoystickV2.BOOTLOADER_STATUS_INVALID_MODE = 1
• BrickletJoystickV2.BOOTLOADER_STATUS_NO_CHANGE = 2
• BrickletJoystickV2.BOOTLOADER_STATUS_ENTRY_FUNCTION_NOT_PRESENT = 3
• BrickletJoystickV2.BOOTLOADER_STATUS_DEVICE_IDENTIFIER_INCORRECT = 4
• BrickletJoystickV2.BOOTLOADER_STATUS_CRC_MISMATCH = 5

int BrickletJoystickV2.getBootloaderMode()¶

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

Returns the current bootloader mode, see setBootloaderMode().

The following constants are available for this function:

For mode:

• BrickletJoystickV2.BOOTLOADER_MODE_BOOTLOADER = 0
• BrickletJoystickV2.BOOTLOADER_MODE_FIRMWARE = 1
• BrickletJoystickV2.BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
• BrickletJoystickV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
• BrickletJoystickV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4

void BrickletJoystickV2.setWriteFirmwarePointer(long pointer)¶

Parameters:	pointer – Type: long, 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.

int BrickletJoystickV2.writeFirmware(int[] data)¶

Parameters:	data – Type: int[], Length: 64, Range: [0 to 255]
Returns:	status – Type: int, 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.

void BrickletJoystickV2.writeUID(long uid)¶

Parameters:	uid – Type: long, 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.

long BrickletJoystickV2.readUID()¶

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

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

Constants¶

int BrickletJoystickV2.DEVICE_IDENTIFIER¶

This constant is used to identify a Joystick Bricklet 2.0.

The getIdentity() function and the IPConnection.EnumerateListener listener of the IP Connection have a deviceIdentifier parameter to specify the Brick's or Bricklet's type.

String BrickletJoystickV2.DEVICE_DISPLAY_NAME¶

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