64 lines
1.4 KiB
C++
64 lines
1.4 KiB
C++
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// STL includes
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#include <cstring>
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#include <cstdio>
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#include <iostream>
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// Linux includes
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#include <fcntl.h>
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#include <sys/ioctl.h>
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// hyperion local includes
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#include "LedDeviceWs2812SPI.h"
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LedDeviceWs2812SPI::LedDeviceWs2812SPI(const std::string& outputDevice, const unsigned baudrate, const int spiMode, const bool spiDataInvert)
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: LedSpiDevice(outputDevice, baudrate, 0, spiMode, spiDataInvert)
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, bitpair_to_byte {
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0b10001000,
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0b10001100,
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0b11001000,
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0b11001100,
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}
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{
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// empty
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}
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int LedDeviceWs2812SPI::write(const std::vector<ColorRgb> &ledValues)
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{
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_ledCount = ledValues.size();
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// 3 colours, 4 spi bytes per colour + 3 frame end latch bytes
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const int SPI_BYTES_PER_LED = 3 * 4;
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unsigned spi_size = _ledCount * SPI_BYTES_PER_LED + 3;
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if(_ledBuffer.size() != spi_size)
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{
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_ledBuffer.resize(spi_size, 0x00);
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}
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unsigned spi_ptr = 0;
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for (unsigned i=0; i< (unsigned)_ledCount; ++i)
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{
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uint32_t colorBits = ((unsigned int)ledValues[i].red << 16)
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| ((unsigned int)ledValues[i].green << 8)
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| ledValues[i].blue;
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for (int j=SPI_BYTES_PER_LED - 1; j>=0; j--)
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{
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_ledBuffer[spi_ptr+j] = bitpair_to_byte[ colorBits & 0x3 ];
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colorBits >>= 2;
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}
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spi_ptr += SPI_BYTES_PER_LED;
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}
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_ledBuffer[spi_ptr++] = 0;
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_ledBuffer[spi_ptr++] = 0;
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_ledBuffer[spi_ptr++] = 0;
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return writeBytes(spi_size, _ledBuffer.data());
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}
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int LedDeviceWs2812SPI::switchOff()
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{
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return write(std::vector<ColorRgb>(_ledCount, ColorRgb{0,0,0}));
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}
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