91 lines
1.9 KiB
C++
91 lines
1.9 KiB
C++
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// Local Hyperion-Leddevice includes
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#include "LedDeviceWs2812b.h"
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LedDeviceWs2812b::LedDeviceWs2812b() :
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LedRs232Device("/dev/ttyAMA0", 4000000)
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{
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fillTable();
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}
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int LedDeviceWs2812b::write(const std::vector<ColorRgb> & ledValues)
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{
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// Ensure the size of the led-buffer
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if (_ledBuffer.size() != ledValues.size()*3)
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{
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_ledBuffer.resize(ledValues.size()*3);
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}
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// Translate the channel of each color to a signal
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auto bufIt = _ledBuffer.begin();
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for (const ColorRgb& color : ledValues)
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{
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*bufIt++ = _byte2signalTable[color.red];
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*bufIt++ = _byte2signalTable[color.green];
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*bufIt++ = _byte2signalTable[color.blue];
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}
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return writeBytes(_ledBuffer.size()*sizeof(ByteSignal), reinterpret_cast<uint8_t *>(_ledBuffer.data()));
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}
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int LedDeviceWs2812b::switchOff()
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{
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// Set all bytes in the signal buffer to zero
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for (ByteSignal & signal : _ledBuffer)
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{
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signal = _byte2signalTable[0];
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}
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return writeBytes(_ledBuffer.size()*sizeof(ByteSignal), reinterpret_cast<uint8_t *>(_ledBuffer.data()));
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}
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void LedDeviceWs2812b::fillTable()
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{
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_byte2signalTable.clear();
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for (int byte=0; byte<256; ++byte)
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{
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const ByteSignal signal = byte2Signal(uint8_t(byte));
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_byte2signalTable.push_back(signal);
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}
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}
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LedDeviceWs2812b::ByteSignal LedDeviceWs2812b::byte2Signal(const uint8_t byte) const
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{
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ByteSignal result;
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result.bit_12 = bits2Signal(byte & 0x80, byte & 0x40);
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result.bit_34 = bits2Signal(byte & 0x20, byte & 0x10);
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result.bit_56 = bits2Signal(byte & 0x08, byte & 0x04);
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result.bit_78 = bits2Signal(byte & 0x02, byte & 0x01);
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return result;
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}
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uint8_t LedDeviceWs2812b::bits2Signal(const bool bit1, const bool bit2) const
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{
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// See https://github.com/tvdzwan/hyperion/wiki/Ws2812b for the explanation of the given
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// translations
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if (bit1)
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{
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if (bit2)
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{
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return 0x8C;
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}
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else
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{
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return 0xCC;
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}
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}
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else
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{
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if (bit2)
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{
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return 0x8E;
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}
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else
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{
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return 0xCE;
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}
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}
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return 0x00;
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}
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