led_strip_bricklet

package
v0.0.0-...-368b749 Latest Latest
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 Go to latest Published: Feb 27, 2024 License: CC0-1.0 Imports: 5 Imported by: 0

Documentation

Overview

Controls up to 320 RGB LEDs.

See also the documentation here: https://www.tinkerforge.com/en/doc/Software/Bricklets/LEDStrip_Bricklet_Go.html.

Index

Constants

View Source 
const DeviceDisplayName = "LED Strip Bricklet"
View Source 
const DeviceIdentifier = 231

Variables

This section is empty.

Functions

This section is empty.

Types

type ChannelMapping 

type ChannelMapping = uint8
const (
	ChannelMappingRGB  ChannelMapping = 6
	ChannelMappingRBG  ChannelMapping = 9
	ChannelMappingBRG  ChannelMapping = 33
	ChannelMappingBGR  ChannelMapping = 36
	ChannelMappingGRB  ChannelMapping = 18
	ChannelMappingGBR  ChannelMapping = 24
	ChannelMappingRGBW ChannelMapping = 27
	ChannelMappingRGWB ChannelMapping = 30
	ChannelMappingRBGW ChannelMapping = 39
	ChannelMappingRBWG ChannelMapping = 45
	ChannelMappingRWGB ChannelMapping = 54
	ChannelMappingRWBG ChannelMapping = 57
	ChannelMappingGRWB ChannelMapping = 78
	ChannelMappingGRBW ChannelMapping = 75
	ChannelMappingGBWR ChannelMapping = 108
	ChannelMappingGBRW ChannelMapping = 99
	ChannelMappingGWBR ChannelMapping = 120
	ChannelMappingGWRB ChannelMapping = 114
	ChannelMappingBRGW ChannelMapping = 135
	ChannelMappingBRWG ChannelMapping = 141
	ChannelMappingBGRW ChannelMapping = 147
	ChannelMappingBGWR ChannelMapping = 156
	ChannelMappingBWRG ChannelMapping = 177
	ChannelMappingBWGR ChannelMapping = 180
	ChannelMappingWRBG ChannelMapping = 201
	ChannelMappingWRGB ChannelMapping = 198
	ChannelMappingWGBR ChannelMapping = 216
	ChannelMappingWGRB ChannelMapping = 210
	ChannelMappingWBGR ChannelMapping = 228
	ChannelMappingWBRG ChannelMapping = 225
)

type ChipType 

type ChipType = uint16
const (
	ChipTypeWS2801  ChipType = 2801
	ChipTypeWS2811  ChipType = 2811
	ChipTypeWS2812  ChipType = 2812
	ChipTypeLPD8806 ChipType = 8806
	ChipTypeAPA102  ChipType = 102
)

type Function 

type Function = uint8
const (
	FunctionSetRGBValues                   Function = 1
	FunctionGetRGBValues                   Function = 2
	FunctionSetFrameDuration               Function = 3
	FunctionGetFrameDuration               Function = 4
	FunctionGetSupplyVoltage               Function = 5
	FunctionSetClockFrequency              Function = 7
	FunctionGetClockFrequency              Function = 8
	FunctionSetChipType                    Function = 9
	FunctionGetChipType                    Function = 10
	FunctionSetRGBWValues                  Function = 11
	FunctionGetRGBWValues                  Function = 12
	FunctionSetChannelMapping              Function = 13
	FunctionGetChannelMapping              Function = 14
	FunctionEnableFrameRenderedCallback    Function = 15
	FunctionDisableFrameRenderedCallback   Function = 16
	FunctionIsFrameRenderedCallbackEnabled Function = 17
	FunctionGetIdentity                    Function = 255
	FunctionCallbackFrameRendered          Function = 6
)

type LEDStripBricklet 

type LEDStripBricklet struct {
	// contains filtered or unexported fields
}

func New 

func New(uid string, ipcon *ipconnection.IPConnection) (LEDStripBricklet, error)

Creates an object with the unique device ID `uid`. This object can then be used after the IP Connection `ipcon` is connected.

func (*LEDStripBricklet) DeregisterFrameRenderedCallback 

func (device *LEDStripBricklet) DeregisterFrameRenderedCallback(registrationId uint64)

Remove a registered Frame Rendered callback.

func (*LEDStripBricklet) DisableFrameRenderedCallback 

func (device *LEDStripBricklet) DisableFrameRenderedCallback() (err error)

Disables the RegisterFrameRenderedCallback callback.

By default the callback is enabled.

.. versionadded:: 2.0.6$nbsp;(Plugin)

func (*LEDStripBricklet) EnableFrameRenderedCallback 

func (device *LEDStripBricklet) EnableFrameRenderedCallback() (err error)

Enables the RegisterFrameRenderedCallback callback.

By default the callback is enabled.

.. versionadded:: 2.0.6$nbsp;(Plugin)

func (*LEDStripBricklet) GetAPIVersion 

func (device *LEDStripBricklet) GetAPIVersion() [3]uint8

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.

func (*LEDStripBricklet) GetChannelMapping 

func (device *LEDStripBricklet) GetChannelMapping() (mapping ChannelMapping, err error)

Returns the currently used channel mapping as set by SetChannelMapping.

.. versionadded:: 2.0.6$nbsp;(Plugin)

Associated constants:

  • ChannelMappingRGB
  • ChannelMappingRBG
  • ChannelMappingBRG
  • ChannelMappingBGR
  • ChannelMappingGRB
  • ChannelMappingGBR
  • ChannelMappingRGBW
  • ChannelMappingRGWB
  • ChannelMappingRBGW
  • ChannelMappingRBWG
  • ChannelMappingRWGB
  • ChannelMappingRWBG
  • ChannelMappingGRWB
  • ChannelMappingGRBW
  • ChannelMappingGBWR
  • ChannelMappingGBRW
  • ChannelMappingGWBR
  • ChannelMappingGWRB
  • ChannelMappingBRGW
  • ChannelMappingBRWG
  • ChannelMappingBGRW
  • ChannelMappingBGWR
  • ChannelMappingBWRG
  • ChannelMappingBWGR
  • ChannelMappingWRBG
  • ChannelMappingWRGB
  • ChannelMappingWGBR
  • ChannelMappingWGRB
  • ChannelMappingWBGR
  • ChannelMappingWBRG

func (*LEDStripBricklet) GetChipType 

func (device *LEDStripBricklet) GetChipType() (chip ChipType, err error)

Returns the currently used chip type as set by SetChipType.

.. versionadded:: 2.0.2$nbsp;(Plugin)

Associated constants:

  • ChipTypeWS2801
  • ChipTypeWS2811
  • ChipTypeWS2812
  • ChipTypeLPD8806
  • ChipTypeAPA102

func (*LEDStripBricklet) GetClockFrequency 

func (device *LEDStripBricklet) GetClockFrequency() (frequency uint32, err error)

Returns the currently used clock frequency as set by SetClockFrequency.

.. versionadded:: 2.0.1$nbsp;(Plugin)

func (*LEDStripBricklet) GetFrameDuration 

func (device *LEDStripBricklet) GetFrameDuration() (duration uint16, err error)

Returns the frame duration as set by SetFrameDuration.

func (*LEDStripBricklet) GetIdentity 

func (device *LEDStripBricklet) GetIdentity() (uid string, connectedUid string, position rune, hardwareVersion [3]uint8, firmwareVersion [3]uint8, deviceIdentifier uint16, err 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 <isolator_bricklet>` is always at position 'z'.

The device identifier numbers can be found `here <device_identifier>`. |device_identifier_constant|

func (*LEDStripBricklet) GetRGBValues 

func (device *LEDStripBricklet) GetRGBValues(index uint16, length uint8) (r [16]uint8, g [16]uint8, b [16]uint8, err error)

Returns *length* R, G and B values starting from the given LED *index*.

The values are the last values that were set by SetRGBValues.

func (*LEDStripBricklet) GetRGBWValues 

func (device *LEDStripBricklet) GetRGBWValues(index uint16, length uint8) (r [12]uint8, g [12]uint8, b [12]uint8, w [12]uint8, err error)

Returns *length* RGBW values starting from the given *index*.

The values are the last values that were set by SetRGBWValues.

.. versionadded:: 2.0.6$nbsp;(Plugin)

func (*LEDStripBricklet) GetResponseExpected 

func (device *LEDStripBricklet) GetResponseExpected(functionID Function) (bool, 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.

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

func (*LEDStripBricklet) GetSupplyVoltage 

func (device *LEDStripBricklet) GetSupplyVoltage() (voltage uint16, err error)

Returns the current supply voltage of the LEDs.

func (*LEDStripBricklet) IsFrameRenderedCallbackEnabled 

func (device *LEDStripBricklet) IsFrameRenderedCallbackEnabled() (enabled bool, err error)

Returns *true* if the RegisterFrameRenderedCallback callback is enabled, *false* otherwise.

.. versionadded:: 2.0.6$nbsp;(Plugin)

func (*LEDStripBricklet) RegisterFrameRenderedCallback 

func (device *LEDStripBricklet) RegisterFrameRenderedCallback(fn func(uint16)) uint64

This callback is triggered directly after a new frame is rendered. The parameter is the number of RGB or RGBW LEDs in that frame.

You should send the data for the next frame directly after this callback was triggered.

For an explanation of the general approach see SetRGBValues.

func (*LEDStripBricklet) SetChannelMapping 

func (device *LEDStripBricklet) SetChannelMapping(mapping ChannelMapping) (err error)

Sets the channel mapping for the connected LEDs.

SetRGBValues and SetRGBWValues take the data in RGB(W) order. But the connected LED driver chips might have their 3 or 4 channels in a different order. For example, the WS2801 chips typically use BGR order, the WS2812 chips typically use GRB order and the APA102 chips typically use WBGR order.

The APA102 chips are special. They have three 8-bit channels for RGB and an additional 5-bit channel for the overall brightness of the RGB LED making them 4-channel chips. Internally the brightness channel is the first channel, therefore one of the Wxyz channel mappings should be used. Then the W channel controls the brightness.

If a 3-channel mapping is selected then SetRGBValues has to be used. Calling SetRGBWValues with a 3-channel mapping will produce incorrect results. Vice-versa if a 4-channel mapping is selected then SetRGBWValues has to be used. Calling SetRGBValues with a 4-channel mapping will produce incorrect results.

.. versionadded:: 2.0.6$nbsp;(Plugin)

Associated constants:

  • ChannelMappingRGB
  • ChannelMappingRBG
  • ChannelMappingBRG
  • ChannelMappingBGR
  • ChannelMappingGRB
  • ChannelMappingGBR
  • ChannelMappingRGBW
  • ChannelMappingRGWB
  • ChannelMappingRBGW
  • ChannelMappingRBWG
  • ChannelMappingRWGB
  • ChannelMappingRWBG
  • ChannelMappingGRWB
  • ChannelMappingGRBW
  • ChannelMappingGBWR
  • ChannelMappingGBRW
  • ChannelMappingGWBR
  • ChannelMappingGWRB
  • ChannelMappingBRGW
  • ChannelMappingBRWG
  • ChannelMappingBGRW
  • ChannelMappingBGWR
  • ChannelMappingBWRG
  • ChannelMappingBWGR
  • ChannelMappingWRBG
  • ChannelMappingWRGB
  • ChannelMappingWGBR
  • ChannelMappingWGRB
  • ChannelMappingWBGR
  • ChannelMappingWBRG

func (*LEDStripBricklet) SetChipType 

func (device *LEDStripBricklet) SetChipType(chip ChipType) (err error)

Sets the type of the LED driver chip. We currently support the chips

* WS2801, * WS2811, * WS2812 / SK6812 / NeoPixel RGB, * SK6812RGBW / NeoPixel RGBW (Chip Type = WS2812), * LPD8806 and * APA102 / DotStar.

.. versionadded:: 2.0.2$nbsp;(Plugin)

Associated constants:

  • ChipTypeWS2801
  • ChipTypeWS2811
  • ChipTypeWS2812
  • ChipTypeLPD8806
  • ChipTypeAPA102

func (*LEDStripBricklet) SetClockFrequency 

func (device *LEDStripBricklet) SetClockFrequency(frequency uint32) (err error)

Sets the frequency of the clock.

The Bricklet will choose the nearest achievable frequency, which may be off by a few Hz. You can get the exact frequency that is used by calling GetClockFrequency.

If you have problems with flickering LEDs, they may be bits flipping. You can fix this by either making the connection between the LEDs and the Bricklet shorter or by reducing the frequency.

With a decreasing frequency your maximum frames per second will decrease too.

Note 

The frequency in firmware version 2.0.0 is fixed at 2MHz.

.. versionadded:: 2.0.1$nbsp;(Plugin)

func (*LEDStripBricklet) SetFrameDuration 

func (device *LEDStripBricklet) SetFrameDuration(duration uint16) (err error)

Sets the frame duration.

Example: If you want to achieve 20 frames per second, you should set the frame duration to 50ms (50ms * 20 = 1 second).

For an explanation of the general approach see SetRGBValues.

func (*LEDStripBricklet) SetRGBValues 

func (device *LEDStripBricklet) SetRGBValues(index uint16, length uint8, r [16]uint8, g [16]uint8, b [16]uint8) (err error)

Sets *length* RGB values for the LEDs starting from *index*.

To make the colors show correctly you need to configure the chip type (SetChipType) and a 3-channel channel mapping (SetChannelMapping) according to the connected LEDs.

Example: If you set

* index to 5, * length to 3, * r to [255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], * g to [0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] and * b to [0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

the LED with index 5 will be red, 6 will be green and 7 will be blue.

Note Depending on the LED circuitry colors can be permuted.

The colors will be transfered to actual LEDs when the next frame duration ends, see SetFrameDuration.

Generic approach:

  • Set the frame duration to a value that represents the number of frames per second you want to achieve.
  • Set all of the LED colors for one frame.
  • Wait for the RegisterFrameRenderedCallback callback.
  • Set all of the LED colors for next frame.
  • Wait for the RegisterFrameRenderedCallback callback.
  • and so on.

This approach ensures that you can change the LED colors with a fixed frame rate.

The actual number of controllable LEDs depends on the number of free Bricklet ports. See `here <led_strip_bricklet_ram_constraints>` for more information. A call of SetRGBValues with index + length above the bounds is ignored completely.

func (*LEDStripBricklet) SetRGBWValues 

func (device *LEDStripBricklet) SetRGBWValues(index uint16, length uint8, r [12]uint8, g [12]uint8, b [12]uint8, w [12]uint8) (err error)

Sets *length* RGBW values for the LEDs starting from *index*.

To make the colors show correctly you need to configure the chip type (SetChipType) and a 4-channel channel mapping (SetChannelMapping) according to the connected LEDs.

The maximum length is 12, the index goes from 0 to 239 and the rgbw values have 8 bits each.

Example: If you set

* index to 5, * length to 4, * r to [255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], * g to [0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], * b to [0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0] and * w to [0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0]

the LED with index 5 will be red, 6 will be green, 7 will be blue and 8 will be white.

Note Depending on the LED circuitry colors can be permuted.

The colors will be transfered to actual LEDs when the next frame duration ends, see SetFrameDuration.

Generic approach:

  • Set the frame duration to a value that represents the number of frames per second you want to achieve.
  • Set all of the LED colors for one frame.
  • Wait for the RegisterFrameRenderedCallback callback.
  • Set all of the LED colors for next frame.
  • Wait for the RegisterFrameRenderedCallback callback.
  • and so on.

This approach ensures that you can change the LED colors with a fixed frame rate.

The actual number of controllable LEDs depends on the number of free Bricklet ports. See `here <led_strip_bricklet_ram_constraints>` for more information. A call of SetRGBWValues with index + length above the bounds is ignored completely.

The LPD8806 LED driver chips have 7-bit channels for RGB. Internally the LED Strip Bricklets divides the 8-bit values set using this function by 2 to make them 7-bit. Therefore, you can just use the normal value range (0-255) for LPD8806 LEDs.

The brightness channel of the APA102 LED driver chips has 5-bit. Internally the LED Strip Bricklets divides the 8-bit values set using this function by 8 to make them 5-bit. Therefore, you can just use the normal value range (0-255) for the brightness channel of APA102 LEDs.

.. versionadded:: 2.0.6$nbsp;(Plugin)

func (*LEDStripBricklet) SetResponseExpected 

func (device *LEDStripBricklet) SetResponseExpected(functionID Function, responseExpected bool) 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.

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.

func (*LEDStripBricklet) SetResponseExpectedAll 

func (device *LEDStripBricklet) SetResponseExpectedAll(responseExpected bool)

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

Source Files

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