77 lines
1.8 KiB
C++
77 lines
1.8 KiB
C++
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#pragma once
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// Hyperion leddevice includes
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#include "LedRs232Device.h"
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///
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/// The LedDevice for controlling a string of WS2812B leds. These are controlled over the mini-UART
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/// of the RPi (/dev/ttyAMA0).
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///
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class LedDeviceWs2812b : public LedRs232Device
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{
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public:
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///
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/// Constructs the device (all required parameters are hardcoded)
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///
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LedDeviceWs2812b();
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///
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/// Write the color data the the WS2812B led string
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///
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/// @param ledValues The color data
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/// @return Zero on succes else negative
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///
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virtual int write(const std::vector<ColorRgb> & ledValues);
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///
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/// Write zero to all leds(that have been written by a previous write operation)
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///
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/// @return Zero on succes else negative
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///
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virtual int switchOff();
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private:
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///
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/// Structure holding the four output-bytes corresponding to a single input byte
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///
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struct ByteSignal
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{
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uint8_t bit_12;
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uint8_t bit_34;
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uint8_t bit_56;
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uint8_t bit_78;
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};
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/// Translation table from single input-byte to output-bytes
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std::vector<ByteSignal> _byte2signalTable;
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///
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/// Fills the translation table (_byte2signalTable)
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///
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void fillTable();
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///
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/// Computes the output bytes that belong to a given input-byte (no table lookup)
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///
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/// @param byte The input byte
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/// @return The four bytes (ByteSignal) for the output signal
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///
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ByteSignal byte2Signal(const uint8_t byte) const;
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///
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/// Translates two bits to a single byte
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///
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/// @param bit1 The value of the first bit (1=true, zero=false)
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/// @param bit1 The value of the ssecond bit (1=true, zero=false)
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///
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/// @return The output-byte for the given two bit
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///
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uint8_t bits2Signal(const bool bit1, const bool bit2) const;
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///
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/// The output buffer for writing bytes to the output
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///
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std::vector<ByteSignal> _ledBuffer;
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};
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