hyperion.ng/libsrc/leddevice/LedDeviceWs2812b.h

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#pragma once
// Hyperion leddevice includes
#include "LedRs232Device.h"
///
/// The LedDevice for controlling a string of WS2812B leds. These are controlled over the mini-UART
/// of the RPi (/dev/ttyAMA0).
///
class LedDeviceWs2812b : public LedRs232Device
{
public:
///
/// Constructs the device (all required parameters are hardcoded)
///
LedDeviceWs2812b();
///
/// Write the color data the the WS2812B led string
///
/// @param ledValues The color data
/// @return Zero on succes else negative
///
virtual int write(const std::vector<ColorRgb> & ledValues);
///
/// Write zero to all leds(that have been written by a previous write operation)
///
/// @return Zero on succes else negative
///
virtual int switchOff();
private:
///
/// Translate a color to the signal bits. The resulting bits are written to the given memory.
///
/// @param color The color to translate
/// @param signal The pointer at the beginning of the signal to write
/// @return The pointer at the end of the written signal
///
uint8_t * color2signal(const ColorRgb & color, uint8_t * signal);
///
/// Translates three bits to a single byte
///
/// @param bit1 The value of the first bit (1=true, zero=false)
/// @param bit2 The value of the second bit (1=true, zero=false)
/// @param bit3 The value of the third bit (1=true, zero=false)
///
/// @return The output-byte for the given two bit
///
uint8_t bits2Signal(const bool bit1, const bool bit2, const bool bit3) const;
///
/// The output buffer for writing bytes to the output
///
std::vector<uint8_t> _ledBuffer;
};