Software / API Bindings / Go / API Reference and Examples / Bricklets / Performance DC Bricklet

Go - Performance DC Bricklet¶

This is the description of the Go API bindings for the Performance DC Bricklet. General information and technical specifications for the Performance DC Bricklet are summarized in its hardware description.

An installation guide for the Go API bindings is part of their general description. Additional documentation can be found on godoc.org.

Examples¶

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

Configuration¶

Download (example_configuration.go)

package main

import (
    "fmt"
    "github.com/Tinkerforge/go-api-bindings/ipconnection"
    "github.com/Tinkerforge/go-api-bindings/performance_dc_bricklet"
    "time"
)

const ADDR string = "localhost:4223"
const UID string = "XYZ" // Change XYZ to the UID of your Performance DC Bricklet.

func main() {
    ipcon := ipconnection.New()
    defer ipcon.Close()
    pdc, _ := performance_dc_bricklet.New(UID, &ipcon) // Create device object.

    ipcon.Connect(ADDR) // Connect to brickd.
    defer ipcon.Disconnect()
    // Don't use device before ipcon is connected.

    pdc.SetDriveMode(performance_dc_bricklet.DriveModeDriveCoast)
    pdc.SetPWMFrequency(10000) // Use PWM frequency of 10 kHz
    pdc.SetMotion(4096, 4096)  // Slow ac-/deceleration (12.5 %/s)
    pdc.SetVelocity(32767)     // Full speed forward (100 %)
    pdc.SetEnabled(true)       // Enable motor power

    fmt.Print("Press enter to exit.")
    fmt.Scanln()

    // Stop motor before disabling motor power
    pdc.SetMotion(4096, 16384)          // Fast decceleration (50 %/s) for stopping
    pdc.SetVelocity(0)                  // Request motor stop
    time.Sleep(2000 * time.Millisecond) // Wait for motor to actually stop: velocity (100 %) / decceleration (50 %/s) = 2 s
    pdc.SetEnabled(false)               // Disable motor power
}

Callback¶

Download (example_callback.go)

package main

import (
    "fmt"
    "github.com/Tinkerforge/go-api-bindings/ipconnection"
    "github.com/Tinkerforge/go-api-bindings/performance_dc_bricklet"
    "time"
)

const ADDR string = "localhost:4223"
const UID string = "XYZ" // Change XYZ to the UID of your Performance DC Bricklet.

func main() {
    ipcon := ipconnection.New()
    defer ipcon.Close()
    pdc, _ := performance_dc_bricklet.New(UID, &ipcon) // Create device object.

    ipcon.Connect(ADDR) // Connect to brickd.
    defer ipcon.Disconnect()
    // Don't use device before ipcon is connected.

    pdc.RegisterVelocityReachedCallback(func(velocity int16) {
        if velocity == 32767 {
            fmt.Println("Velocity: Full speed forward, now turning backward")
            pdc.SetVelocity(-32767)
        } else if velocity == -32767 {
            fmt.Println("Velocity: Full speed backward, now turning forward")
            pdc.SetVelocity(32767)
        } else {
            //can only happen if another program sets velocity
            fmt.Println("Error")
        }
    })

    // Enable velocity reached callback
    pdc.SetVelocityReachedCallbackConfiguration(true)

    // The acceleration has to be smaller or equal to the maximum
    // acceleration of the DC motor, otherwise the velocity reached
    // callback will be called too early
    pdc.SetMotion(4096, 4096) // Slow acceleration (12.5 %/s)
    pdc.SetVelocity(32767)    // Full speed forward (100 %)

    // Enable motor power
    pdc.SetEnabled(true)

    fmt.Print("Press enter to exit.")
    fmt.Scanln()

    // Stop motor before disabling motor power
    pdc.SetMotion(4096, 16384)          // Fast decceleration (50 %/s) for stopping
    pdc.SetVelocity(0)                  // Request motor stop
    time.Sleep(2000 * time.Millisecond) // Wait for motor to actually stop: velocity (100 %) / decceleration (50 %/s) = 2 s
    pdc.SetEnabled(false)               // Disable motor power
}

API¶

The Performance DC Bricklet API is defined in the package github.com/Tinkerforge/go-api-bindings/performance_dc_bricklet

Nearly every function of the Go bindings can return an ipconnection.DeviceError, implementing the error interface. The error can have one of the following values:

ipconnection.DeviceErrorSuccess = 0
ipconnection.DeviceErrorInvalidParameter = 1
ipconnection.DeviceErrorFunctionNotSupported = 2
ipconnection.DeviceErrorUnknownError = 3

which correspond to the values returned from Bricks and Bricklets.

All functions listed below are thread-safe.

Basic Functions¶

func performance_dc_bricklet.New(uid string, ipcon *IPConnection) (device PerformanceDCBricklet, err error)¶

Parameters:	uid – Type: string ipcon – Type: *IPConnection
Returns:	device – Type: PerformanceDCBricklet err – Type: error

Creates a new PerformanceDCBricklet object with the unique device ID uid and adds it to the IPConnection ipcon:

device, err := performance_dc_bricklet.New("YOUR_DEVICE_UID", &ipcon)

This device object can be used after the IPConnection has been connected.

func (*PerformanceDCBricklet) SetEnabled(enabled bool) (err error)¶

Parameters:	enabled – Type: bool
Returns:	err – Type: error

Enables/Disables the driver chip. The driver parameters can be configured (velocity, acceleration, etc) before it is enabled.

func (*PerformanceDCBricklet) GetEnabled() (enabled bool, err error)¶

Returns:	enabled – Type: bool, Default: false err – Type: error

Returns true if the driver chip is enabled, false otherwise.

func (*PerformanceDCBricklet) SetVelocity(velocity int16) (err error)¶

Parameters:	velocity – Type: int16, Unit: 100/32767 %, Range: [-2¹⁵ + 1 to 2¹⁵ - 1], Default: 0
Returns:	err – Type: error

Sets the velocity of the motor. Whereas -32767 is full speed backward, 0 is stop and 32767 is full speed forward. Depending on the acceleration (see SetMotion()), the motor is not immediately brought to the velocity but smoothly accelerated.

The velocity describes the duty cycle of the PWM with which the motor is controlled, e.g. a velocity of 3277 sets a PWM with a 10% duty cycle. You can not only control the duty cycle of the PWM but also the frequency, see SetPWMFrequency().

func (*PerformanceDCBricklet) GetVelocity() (velocity int16, err error)¶

Returns:	velocity – Type: int16, Unit: 100/32767 %, Range: [-2¹⁵ + 1 to 2¹⁵ - 1], Default: 0 err – Type: error

Returns the velocity as set by SetVelocity().

func (*PerformanceDCBricklet) GetCurrentVelocity() (velocity int16, err error)¶

Returns:	velocity – Type: int16, Unit: 100/32767 %, Range: [-2¹⁵ + 1 to 2¹⁵ - 1], Default: 0 err – Type: error

Returns the current velocity of the motor. This value is different from GetVelocity() whenever the motor is currently accelerating to a goal set by SetVelocity().

func (*PerformanceDCBricklet) SetMotion(acceleration uint16, deceleration uint16) (err error)¶

Parameters:	acceleration – Type: uint16, Unit: 100/32767 %/s, Range: [0 to 2¹⁶ - 1], Default: 10000 deceleration – Type: uint16, Unit: 100/32767 %/s, Range: [0 to 2¹⁶ - 1], Default: 10000
Returns:	err – Type: error

Sets the acceleration and deceleration of the motor. It is given in velocity/s. An acceleration of 10000 means, that every second the velocity is increased by 10000 (or about 30% duty cycle).

For example: If the current velocity is 0 and you want to accelerate to a velocity of 16000 (about 50% duty cycle) in 10 seconds, you should set an acceleration of 1600.

If acceleration and deceleration is set to 0, there is no speed ramping, i.e. a new velocity is immediately given to the motor.

func (*PerformanceDCBricklet) GetMotion() (acceleration uint16, deceleration uint16, err error)¶

Returns:	acceleration – Type: uint16, Unit: 100/32767 %/s, Range: [0 to 2¹⁶ - 1], Default: 10000 deceleration – Type: uint16, Unit: 100/32767 %/s, Range: [0 to 2¹⁶ - 1], Default: 10000 err – Type: error

Returns the acceleration/deceleration as set by SetMotion().

func (*PerformanceDCBricklet) FullBrake() (err error)¶

Returns:	err – Type: error

Executes an active full brake.

Warning

This function is for emergency purposes, where an immediate brake is necessary. Depending on the current velocity and the strength of the motor, a full brake can be quite violent.

Call SetVelocity() with 0 if you just want to stop the motor.

func (*PerformanceDCBricklet) GetPWMFrequency() (frequency uint16, err error)¶

Returns:	frequency – Type: uint16, Unit: 1 Hz, Range: [1 to 20000], Default: 15000 err – Type: error

Returns the PWM frequency as set by SetPWMFrequency().

func (*PerformanceDCBricklet) GetPowerStatistics() (voltage uint16, current uint16, temperature int16, err error)¶

Returns:	voltage – Type: uint16, Unit: 1 mV, Range: [0 to 2¹⁶ - 1] current – Type: uint16, Unit: 1 mA, Range: [0 to 2¹⁶ - 1] temperature – Type: int16, Unit: 1/10 °, Range: [-2¹⁵ to 2¹⁵ - 1] err – Type: error

Returns input voltage, current usage and temperature of the driver.

func (*PerformanceDCBricklet) SetThermalShutdown(temperature uint8) (err error)¶

Parameters:	temperature – Type: uint8, Unit: 1 °, Range: [0 to 255], Default: 125
Returns:	err – Type: error

Sets a temperature threshold that is used for thermal shutdown.

Additionally to this user defined threshold the driver chip will shut down at a temperature of 150°C.

If a thermal shutdown is triggered the driver is disabled and has to be explicitly re-enabled with SetEnabled().

func (*PerformanceDCBricklet) GetThermalShutdown() (temperature uint8, err error)¶

Returns:	temperature – Type: uint8, Unit: 1 °, Range: [0 to 255] err – Type: error

Returns the thermal shutdown temperature as set by SetThermalShutdown().

func (*PerformanceDCBricklet) SetGPIOConfiguration(channel uint8, debounce uint16, stopDeceleration uint16) (err error)¶

Parameters:	channel – Type: uint8, Range: [0 to 1] debounce – Type: uint16, Unit: 1 ms, Range: [0 to 2¹⁶ - 1], Default: 200 stopDeceleration – Type: uint16, Unit: 100/32767 %/s, Range: [0 to 2¹⁶ - 1], Default: 2¹⁶ - 1
Returns:	err – Type: error

Sets the GPIO configuration for the given channel. You can configure a debounce and the deceleration that is used if the action is configured as normal stop. See SetGPIOAction().

func (*PerformanceDCBricklet) GetGPIOConfiguration(channel uint8) (debounce uint16, stopDeceleration uint16, err error)¶

Parameters:	channel – Type: uint8, Range: [0 to 1]
Returns:	debounce – Type: uint16, Unit: 1 ms, Range: [0 to 2¹⁶ - 1], Default: 200 stopDeceleration – Type: uint16, Unit: 100/32767 %/s, Range: [0 to 2¹⁶ - 1], Default: 2¹⁶ - 1 err – Type: error

Returns the GPIO configuration for a channel as set by SetGPIOConfiguration().

func (*PerformanceDCBricklet) SetGPIOAction(channel uint8, action uint32) (err error)¶

Parameters:	channel – Type: uint8, Range: [0 to 1] action – Type: uint32, Range: See constants, Default: 0
Returns:	err – Type: error

Sets the GPIO action for the given channel.

The action can be a normal stop, a full brake or a callback. Each for a rising edge or falling edge. The actions are a bitmask they can be used at the same time. You can for example trigger a full brake and a callback at the same time or for rising and falling edge.

The deceleration speed for the normal stop can be configured with SetGPIOConfiguration().

The following constants are available for this function:

For action:

performance_dc_bricklet.GPIOActionNone = 0
performance_dc_bricklet.GPIOActionNormalStopRisingEdge = 1
performance_dc_bricklet.GPIOActionNormalStopFallingEdge = 2
performance_dc_bricklet.GPIOActionFullBrakeRisingEdge = 4
performance_dc_bricklet.GPIOActionFullBrakeFallingEdge = 8
performance_dc_bricklet.GPIOActionCallbackRisingEdge = 16
performance_dc_bricklet.GPIOActionCallbackFallingEdge = 32

func (*PerformanceDCBricklet) GetGPIOAction(channel uint8) (action uint32, err error)¶

Parameters:	channel – Type: uint8, Range: [0 to 1]
Returns:	action – Type: uint32, Range: See constants, Default: 0 err – Type: error

Returns the GPIO action for a channel as set by SetGPIOAction().

The following constants are available for this function:

For action:

performance_dc_bricklet.GPIOActionNone = 0
performance_dc_bricklet.GPIOActionNormalStopRisingEdge = 1
performance_dc_bricklet.GPIOActionNormalStopFallingEdge = 2
performance_dc_bricklet.GPIOActionFullBrakeRisingEdge = 4
performance_dc_bricklet.GPIOActionFullBrakeFallingEdge = 8
performance_dc_bricklet.GPIOActionCallbackRisingEdge = 16
performance_dc_bricklet.GPIOActionCallbackFallingEdge = 32

func (*PerformanceDCBricklet) GetGPIOState() (gpioState [2]bool, err error)¶

Returns:	gpioState – Type: [2]bool err – Type: error

Returns the GPIO state for both channels. True if the state is high and false if the state is low.

Advanced Functions¶

func (*PerformanceDCBricklet) SetDriveMode(mode uint8) (err error)¶

Parameters:	mode – Type: uint8, Range: See constants, Default: 0
Returns:	err – Type: error

Sets the drive mode. Possible modes are:

0 = Drive/Brake
1 = Drive/Coast

These modes are different kinds of motor controls.

In Drive/Brake mode, the motor is always either driving or braking. There is no freewheeling. Advantages are: A more linear correlation between PWM and velocity, more exact accelerations and the possibility to drive with slower velocities.

In Drive/Coast mode, the motor is always either driving or freewheeling. Advantages are: Less current consumption and less demands on the motor and driver chip.

The following constants are available for this function:

For mode:

performance_dc_bricklet.DriveModeDriveBrake = 0
performance_dc_bricklet.DriveModeDriveCoast = 1

func (*PerformanceDCBricklet) GetDriveMode() (mode uint8, err error)¶

Returns:	mode – Type: uint8, Range: See constants, Default: 0 err – Type: error

Returns the drive mode, as set by SetDriveMode().

The following constants are available for this function:

For mode:

performance_dc_bricklet.DriveModeDriveBrake = 0
performance_dc_bricklet.DriveModeDriveCoast = 1

func (*PerformanceDCBricklet) SetPWMFrequency(frequency uint16) (err error)¶

Parameters:	frequency – Type: uint16, Unit: 1 Hz, Range: [1 to 20000], Default: 15000
Returns:	err – Type: error

Sets the frequency of the PWM with which the motor is driven. Often a high frequency is less noisy and the motor runs smoother. However, with a low frequency there are less switches and therefore fewer switching losses. Also with most motors lower frequencies enable higher torque.

If you have no idea what all this means, just ignore this function and use the default frequency, it will very likely work fine.

func (*PerformanceDCBricklet) SetErrorLEDConfig(config uint8) (err error)¶

Parameters:	config – Type: uint8, Range: See constants, Default: 3
Returns:	err – Type: error

Configures the error LED to be either turned off, turned on, blink in heartbeat mode or show an error.

If the LED is configured to show errors it has three different states:

Off: No error present.
1s interval blinking: Input voltage too low (below 6V).
250ms interval blinking: Overtemperature or overcurrent.

The following constants are available for this function:

For config:

performance_dc_bricklet.ErrorLEDConfigOff = 0
performance_dc_bricklet.ErrorLEDConfigOn = 1
performance_dc_bricklet.ErrorLEDConfigShowHeartbeat = 2
performance_dc_bricklet.ErrorLEDConfigShowError = 3

func (*PerformanceDCBricklet) GetErrorLEDConfig() (config uint8, err error)¶

Returns:	config – Type: uint8, Range: See constants, Default: 3 err – Type: error

Returns the LED configuration as set by SetErrorLEDConfig()

The following constants are available for this function:

For config:

performance_dc_bricklet.ErrorLEDConfigOff = 0
performance_dc_bricklet.ErrorLEDConfigOn = 1
performance_dc_bricklet.ErrorLEDConfigShowHeartbeat = 2
performance_dc_bricklet.ErrorLEDConfigShowError = 3

func (*PerformanceDCBricklet) SetCWLEDConfig(config uint8) (err error)¶

Parameters:	config – Type: uint8, Range: See constants, Default: 3
Returns:	err – Type: error

Configures the CW LED to be either turned off, turned on, blink in heartbeat mode or if the motor turn clockwise.

The following constants are available for this function:

For config:

performance_dc_bricklet.CWLEDConfigOff = 0
performance_dc_bricklet.CWLEDConfigOn = 1
performance_dc_bricklet.CWLEDConfigShowHeartbeat = 2
performance_dc_bricklet.CWLEDConfigShowCWAsForward = 3
performance_dc_bricklet.CWLEDConfigShowCWAsBackward = 4

func (*PerformanceDCBricklet) GetCWLEDConfig() (config uint8, err error)¶

Returns:	config – Type: uint8, Range: See constants, Default: 3 err – Type: error

Returns the LED configuration as set by SetCWLEDConfig()

The following constants are available for this function:

For config:

performance_dc_bricklet.CWLEDConfigOff = 0
performance_dc_bricklet.CWLEDConfigOn = 1
performance_dc_bricklet.CWLEDConfigShowHeartbeat = 2
performance_dc_bricklet.CWLEDConfigShowCWAsForward = 3
performance_dc_bricklet.CWLEDConfigShowCWAsBackward = 4

func (*PerformanceDCBricklet) SetCCWLEDConfig(config uint8) (err error)¶

Parameters:	config – Type: uint8, Range: See constants, Default: 3
Returns:	err – Type: error

Configures the CCW LED to be either turned off, turned on, blink in heartbeat mode or if the motor turn counter-clockwise.

The following constants are available for this function:

For config:

performance_dc_bricklet.CCWLEDConfigOff = 0
performance_dc_bricklet.CCWLEDConfigOn = 1
performance_dc_bricklet.CCWLEDConfigShowHeartbeat = 2
performance_dc_bricklet.CCWLEDConfigShowCCWAsForward = 3
performance_dc_bricklet.CCWLEDConfigShowCCWAsBackward = 4

func (*PerformanceDCBricklet) GetCCWLEDConfig() (config uint8, err error)¶

Returns:	config – Type: uint8, Range: See constants, Default: 3 err – Type: error

Returns the LED configuration as set by SetCCWLEDConfig()

The following constants are available for this function:

For config:

performance_dc_bricklet.CCWLEDConfigOff = 0
performance_dc_bricklet.CCWLEDConfigOn = 1
performance_dc_bricklet.CCWLEDConfigShowHeartbeat = 2
performance_dc_bricklet.CCWLEDConfigShowCCWAsForward = 3
performance_dc_bricklet.CCWLEDConfigShowCCWAsBackward = 4

func (*PerformanceDCBricklet) SetGPIOLEDConfig(channel uint8, config uint8) (err error)¶

Parameters:	channel – Type: uint8, Range: [0 to 1] config – Type: uint8, Range: See constants, Default: 4
Returns:	err – Type: error

Configures the GPIO LED to be either turned off, turned on, blink in heartbeat mode or the GPIO state.

The GPIO LED can be configured for both channels.

The following constants are available for this function:

For config:

performance_dc_bricklet.GPIOLEDConfigOff = 0
performance_dc_bricklet.GPIOLEDConfigOn = 1
performance_dc_bricklet.GPIOLEDConfigShowHeartbeat = 2
performance_dc_bricklet.GPIOLEDConfigShowGPIOActiveHigh = 3
performance_dc_bricklet.GPIOLEDConfigShowGPIOActiveLow = 4

func (*PerformanceDCBricklet) GetGPIOLEDConfig(channel uint8) (config uint8, err error)¶

Parameters:	channel – Type: uint8, Range: [0 to 1]
Returns:	config – Type: uint8, Range: See constants, Default: 4 err – Type: error

Returns the LED configuration as set by SetGPIOLEDConfig()

The following constants are available for this function:

For config:

performance_dc_bricklet.GPIOLEDConfigOff = 0
performance_dc_bricklet.GPIOLEDConfigOn = 1
performance_dc_bricklet.GPIOLEDConfigShowHeartbeat = 2
performance_dc_bricklet.GPIOLEDConfigShowGPIOActiveHigh = 3
performance_dc_bricklet.GPIOLEDConfigShowGPIOActiveLow = 4

func (*PerformanceDCBricklet) GetSPITFPErrorCount() (errorCountAckChecksum uint32, errorCountMessageChecksum uint32, errorCountFrame uint32, errorCountOverflow uint32, err error)¶

Returns:	errorCountAckChecksum – Type: uint32, Range: [0 to 2³² - 1] errorCountMessageChecksum – Type: uint32, Range: [0 to 2³² - 1] errorCountFrame – Type: uint32, Range: [0 to 2³² - 1] errorCountOverflow – Type: uint32, Range: [0 to 2³² - 1] err – Type: error

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.

func (*PerformanceDCBricklet) SetStatusLEDConfig(config uint8) (err error)¶

Parameters:	config – Type: uint8, Range: See constants, Default: 3
Returns:	err – Type: error

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:

performance_dc_bricklet.StatusLEDConfigOff = 0
performance_dc_bricklet.StatusLEDConfigOn = 1
performance_dc_bricklet.StatusLEDConfigShowHeartbeat = 2
performance_dc_bricklet.StatusLEDConfigShowStatus = 3

func (*PerformanceDCBricklet) GetStatusLEDConfig() (config uint8, err error)¶

Returns:	config – Type: uint8, Range: See constants, Default: 3 err – Type: error

Returns the configuration as set by SetStatusLEDConfig()

The following constants are available for this function:

For config:

performance_dc_bricklet.StatusLEDConfigOff = 0
performance_dc_bricklet.StatusLEDConfigOn = 1
performance_dc_bricklet.StatusLEDConfigShowHeartbeat = 2
performance_dc_bricklet.StatusLEDConfigShowStatus = 3

func (*PerformanceDCBricklet) GetChipTemperature() (temperature int16, err error)¶

Returns:	temperature – Type: int16, Unit: 1 °C, Range: [-2¹⁵ to 2¹⁵ - 1] err – Type: error

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.

func (*PerformanceDCBricklet) Reset() (err error)¶

Returns:	err – Type: error

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!

func (*PerformanceDCBricklet) GetIdentity() (uid string, connectedUid string, position rune, hardwareVersion [3]uint8, firmwareVersion [3]uint8, deviceIdentifier uint16, err error)¶

Returns:

Returns:	uid – Type: string, Length: up to 8 connectedUid – Type: string, Length: up to 8 position – Type: rune, Range: ['a' to 'h', 'z'] hardwareVersion – Type: [3]uint8 0: major – Type: uint8, Range: [0 to 255] 1: minor – Type: uint8, Range: [0 to 255] 2: revision – Type: uint8, Range: [0 to 255] firmwareVersion – Type: [3]uint8 0: major – Type: uint8, Range: [0 to 255] 1: minor – Type: uint8, Range: [0 to 255] 2: revision – Type: uint8, Range: [0 to 255] deviceIdentifier – Type: uint16, Range: [0 to 2¹⁶ - 1] err – Type: error

uid – Type: string, Length: up to 8
connectedUid – Type: string, Length: up to 8
position – Type: rune, Range: ['a' to 'h', 'z']
hardwareVersion – Type: [3]uint8

0: major – Type: uint8, Range: [0 to 255]
1: minor – Type: uint8, Range: [0 to 255]
2: revision – Type: uint8, Range: [0 to 255]

firmwareVersion – Type: [3]uint8

0: major – Type: uint8, Range: [0 to 255]
1: minor – Type: uint8, Range: [0 to 255]
2: revision – Type: uint8, Range: [0 to 255]

deviceIdentifier – Type: uint16, Range: [0 to 2¹⁶ - 1]
err – Type: error

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¶

func (*PerformanceDCBricklet) SetEmergencyShutdownCallbackConfiguration(enabled bool) (err error)¶

Parameters:	enabled – Type: bool, Default: false
Returns:	err – Type: error

Enable/Disable EmergencyShutdownCallback callback.

func (*PerformanceDCBricklet) GetEmergencyShutdownCallbackConfiguration() (enabled bool, err error)¶

Returns:	enabled – Type: bool, Default: true err – Type: error

Returns the callback configuration as set by SetEmergencyShutdownCallbackConfiguration().

func (*PerformanceDCBricklet) SetVelocityReachedCallbackConfiguration(enabled bool) (err error)¶

Parameters:	enabled – Type: bool, Default: false
Returns:	err – Type: error

Enable/Disable VelocityReachedCallback callback.

func (*PerformanceDCBricklet) GetVelocityReachedCallbackConfiguration() (enabled bool, err error)¶

Returns:	enabled – Type: bool, Default: false err – Type: error

Returns the callback configuration as set by SetVelocityReachedCallbackConfiguration().

func (*PerformanceDCBricklet) SetCurrentVelocityCallbackConfiguration(period uint32, valueHasToChange bool) (err error)¶

Parameters:	period – Type: uint32, Unit: 1 ms, Range: [0 to 2³² - 1], Default: 0 valueHasToChange – Type: bool, Default: false
Returns:	err – Type: error

The period is the period with which the CurrentVelocityCallback 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.

func (*PerformanceDCBricklet) GetCurrentVelocityCallbackConfiguration() (period uint32, valueHasToChange bool, err error)¶

Returns:	period – Type: uint32, Unit: 1 ms, Range: [0 to 2³² - 1], Default: 0 valueHasToChange – Type: bool, Default: false err – Type: error

Returns the callback configuration as set by SetCurrentVelocityCallbackConfiguration().

Callbacks¶

Callbacks can be registered to receive time critical or recurring data from the device. The registration is done with the corresponding Register*Callback function, which returns a unique callback ID. This ID can be used to deregister the callback later with the corresponding Deregister*Callback function.

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.

func (*PerformanceDCBricklet) RegisterEmergencyShutdownCallback(func()) (registrationId uint64)¶

Returns:	registrationId – Type: uint64

This callback is triggered if either the current consumption is too high or the temperature of the driver chip is too high (above 150°C) or the user defined thermal shutdown is triggered (see SetThermalShutdown()). n case of a voltage below 6V (input voltage) this callback is triggered as well.

If this callback is triggered, the driver chip gets disabled at the same time. That means, SetEnabled() has to be called to drive the motor again.

func (*PerformanceDCBricklet) RegisterVelocityReachedCallback(func(velocity int16)) (registrationId uint64)¶

Callback Parameters:	velocity – Type: int16, Unit: 100/32767 %, Range: [-2¹⁵ + 1 to 2¹⁵ - 1]
Returns:	registrationId – Type: uint64

This callback is triggered whenever a set velocity is reached. For example: If a velocity of 0 is present, acceleration is set to 5000 and velocity to 10000, the VelocityReachedCallback callback will be triggered after about 2 seconds, when the set velocity is actually reached.

Note

Since we can't get any feedback from the DC motor, this only works if the acceleration (see SetMotion()) is set smaller or equal to the maximum acceleration of the motor. Otherwise the motor will lag behind the control value and the callback will be triggered too early.

func (*PerformanceDCBricklet) RegisterCurrentVelocityCallback(func(velocity int16)) (registrationId uint64)¶

Callback Parameters:	velocity – Type: int16, Unit: 100/32767 %, Range: [-2¹⁵ + 1 to 2¹⁵ - 1]
Returns:	registrationId – Type: uint64

This callback is triggered with the period that is set by SetCurrentVelocityCallbackConfiguration(). The callback parameter is the current velocity used by the motor.

The CurrentVelocityCallback callback is only triggered after the set period if there is a change in the velocity.

func (*PerformanceDCBricklet) RegisterGPIOStateCallback(func(gpioState [2]bool)) (registrationId uint64)¶

Callback Parameters:	gpioState – Type: [2]bool
Returns:	registrationId – Type: uint64

This callback is triggered by GPIO changes if it is activated through SetGPIOAction().

New in version 2.0.1 (Plugin).

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.

func (*PerformanceDCBricklet) GetAPIVersion() (apiVersion [3]uint8, err error)¶

Returns:	apiVersion – Type: [3]uint8 0: major – Type: uint8, Range: [0 to 255] 1: minor – Type: uint8, Range: [0 to 255] 2: revision – Type: uint8, Range: [0 to 255] err – Type: error

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.

func (*PerformanceDCBricklet) GetResponseExpected(functionId uint8) (responseExpected bool, err error)¶

Parameters:	functionId – Type: uint8, Range: See constants
Returns:	responseExpected – Type: bool err – Type: error

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:

performance_dc_bricklet.FunctionSetEnabled = 1
performance_dc_bricklet.FunctionSetVelocity = 3
performance_dc_bricklet.FunctionSetMotion = 6
performance_dc_bricklet.FunctionFullBrake = 8
performance_dc_bricklet.FunctionSetDriveMode = 9
performance_dc_bricklet.FunctionSetPWMFrequency = 11
performance_dc_bricklet.FunctionSetThermalShutdown = 14
performance_dc_bricklet.FunctionSetGPIOConfiguration = 16
performance_dc_bricklet.FunctionSetGPIOAction = 18
performance_dc_bricklet.FunctionSetErrorLEDConfig = 21
performance_dc_bricklet.FunctionSetCWLEDConfig = 23
performance_dc_bricklet.FunctionSetCCWLEDConfig = 25
performance_dc_bricklet.FunctionSetGPIOLEDConfig = 27
performance_dc_bricklet.FunctionSetEmergencyShutdownCallbackConfiguration = 29
performance_dc_bricklet.FunctionSetVelocityReachedCallbackConfiguration = 31
performance_dc_bricklet.FunctionSetCurrentVelocityCallbackConfiguration = 33
performance_dc_bricklet.FunctionSetWriteFirmwarePointer = 237
performance_dc_bricklet.FunctionSetStatusLEDConfig = 239
performance_dc_bricklet.FunctionReset = 243
performance_dc_bricklet.FunctionWriteUID = 248

func (*PerformanceDCBricklet) SetResponseExpected(functionId uint8, responseExpected bool) (err error)¶

Parameters:	functionId – Type: uint8, Range: See constants responseExpected – Type: bool
Returns:	err – Type: error

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:

performance_dc_bricklet.FunctionSetEnabled = 1
performance_dc_bricklet.FunctionSetVelocity = 3
performance_dc_bricklet.FunctionSetMotion = 6
performance_dc_bricklet.FunctionFullBrake = 8
performance_dc_bricklet.FunctionSetDriveMode = 9
performance_dc_bricklet.FunctionSetPWMFrequency = 11
performance_dc_bricklet.FunctionSetThermalShutdown = 14
performance_dc_bricklet.FunctionSetGPIOConfiguration = 16
performance_dc_bricklet.FunctionSetGPIOAction = 18
performance_dc_bricklet.FunctionSetErrorLEDConfig = 21
performance_dc_bricklet.FunctionSetCWLEDConfig = 23
performance_dc_bricklet.FunctionSetCCWLEDConfig = 25
performance_dc_bricklet.FunctionSetGPIOLEDConfig = 27
performance_dc_bricklet.FunctionSetEmergencyShutdownCallbackConfiguration = 29
performance_dc_bricklet.FunctionSetVelocityReachedCallbackConfiguration = 31
performance_dc_bricklet.FunctionSetCurrentVelocityCallbackConfiguration = 33
performance_dc_bricklet.FunctionSetWriteFirmwarePointer = 237
performance_dc_bricklet.FunctionSetStatusLEDConfig = 239
performance_dc_bricklet.FunctionReset = 243
performance_dc_bricklet.FunctionWriteUID = 248

func (*PerformanceDCBricklet) SetResponseExpectedAll(responseExpected bool) (err error)¶

Parameters:	responseExpected – Type: bool
Returns:	err – Type: error

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.

func (*PerformanceDCBricklet) SetBootloaderMode(mode uint8) (status uint8, err error)¶

Parameters:	mode – Type: uint8, Range: See constants
Returns:	status – Type: uint8, Range: See constants err – Type: error

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:

performance_dc_bricklet.BootloaderModeBootloader = 0
performance_dc_bricklet.BootloaderModeFirmware = 1
performance_dc_bricklet.BootloaderModeBootloaderWaitForReboot = 2
performance_dc_bricklet.BootloaderModeFirmwareWaitForReboot = 3
performance_dc_bricklet.BootloaderModeFirmwareWaitForEraseAndReboot = 4

For status:

performance_dc_bricklet.BootloaderStatusOK = 0
performance_dc_bricklet.BootloaderStatusInvalidMode = 1
performance_dc_bricklet.BootloaderStatusNoChange = 2
performance_dc_bricklet.BootloaderStatusEntryFunctionNotPresent = 3
performance_dc_bricklet.BootloaderStatusDeviceIdentifierIncorrect = 4
performance_dc_bricklet.BootloaderStatusCRCMismatch = 5

func (*PerformanceDCBricklet) GetBootloaderMode() (mode uint8, err error)¶

Returns:	mode – Type: uint8, Range: See constants err – Type: error

Returns the current bootloader mode, see SetBootloaderMode().

The following constants are available for this function:

For mode:

performance_dc_bricklet.BootloaderModeBootloader = 0
performance_dc_bricklet.BootloaderModeFirmware = 1
performance_dc_bricklet.BootloaderModeBootloaderWaitForReboot = 2
performance_dc_bricklet.BootloaderModeFirmwareWaitForReboot = 3
performance_dc_bricklet.BootloaderModeFirmwareWaitForEraseAndReboot = 4

func (*PerformanceDCBricklet) SetWriteFirmwarePointer(pointer uint32) (err error)¶

Parameters:	pointer – Type: uint32, Unit: 1 B, Range: [0 to 2³² - 1]
Returns:	err – Type: error

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.

func (*PerformanceDCBricklet) WriteFirmware(data [64]uint8) (status uint8, err error)¶

Parameters:	data – Type: [64]uint8, Range: [0 to 255]
Returns:	status – Type: uint8, Range: [0 to 255] err – Type: error

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.

func (*PerformanceDCBricklet) WriteUID(uid uint32) (err error)¶

Parameters:	uid – Type: uint32, Range: [0 to 2³² - 1]
Returns:	err – Type: error

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.

func (*PerformanceDCBricklet) ReadUID() (uid uint32, err error)¶

Returns:	uid – Type: uint32, Range: [0 to 2³² - 1] err – Type: error

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

Constants¶

performance_dc_bricklet.DeviceIdentifier¶

This constant is used to identify a Performance DC Bricklet.

The GetIdentity() function and the (*IPConnection) RegisterEnumerateCallback callback of the IPConnection have a deviceIdentifier parameter to specify the Brick's or Bricklet's type.

performance_dc_bricklet.DeviceDisplayName¶: This constant represents the human readable name of a Performance DC Bricklet.