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70 lines
2.1 KiB
70 lines
2.1 KiB
# kaleidoscope::driver::led::WS2812
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This driver provides a generic base class for driving WS2812-based LED strips.
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This is not a plugin, and is not meant to be user-facing. It is meant to be used
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by developers, and hardware plugins in particular. See the [KBDFans
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KBD4x][kbd4x] plugin for a practical, existing example about how to use the
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driver.
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[kbd4x]: ../../../src/kaleidoscope/hardware/kbdfans/KBD4x.h
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## Using the driver
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To use the driver, we need to include the header:
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```c++
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#include <kaleidoscope/driver/led/WS2812.h>
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```
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For performance reasons, the driver is templated, and requires three template
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arguments:
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1. `pin`, the PIN the driver will use to communicate with the LED strip.
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2. `class Color`, the color class that determines the order of the RGB
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components, and should match the component order the LED strip uses. We
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provide three orders out of the box, all in the
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`kaleidoscope::driver::led::color` namespace: `RGB`, `GRB`, and `BGR`.
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3. `ledCount` is the number of LEDs on the strip this instance of the driver
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should be able to address.
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Armed with this knowledge, instantiating an object is as easy as:
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```c++
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using Color = kaleidoscope::driver::led::color::GRB;
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kaleidoscope::driver::led::WS2812<PIN_E2, Color, 6> LEDs;
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```
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## Driver methods
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The instantiated `WS2812` object will have the following methods:
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### `.led_count()`
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> Returns the number of LEDs, the same value as the `ledCount` template
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> argument.
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### `.sync()`
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> Synchronises the internal LED state with the hardware, by sending over all of
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> the LED data.
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>
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> It is recommended to call this at most once per cycle. Calling it less
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> frequently isn't wrong either.
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### `.setColorAt(index, color)`
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### `.setColorAt(index, r, g, b)`
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> Sets the color at the given `index` to the specified value. He value can
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> either be a `Color` object (the same type as the template argument), or a list
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> of RGB component values.
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### `.getColorAt(index)`
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> Returns the color at the given `index`, as a `Color` object.
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## Further information
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To have a better idea how to use the driver in practice, looking at the
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[KBD4x][kbd4x] hardware library is recommended.
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