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68 lines
1.5 KiB
C++
68 lines
1.5 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 "LedDeviceSk6812SPI.h"
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LedDeviceSk6812SPI::LedDeviceSk6812SPI(const std::string& outputDevice, const unsigned baudrate) :
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LedSpiDevice(outputDevice, baudrate, 0),
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mLedCount(0),
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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 LedDeviceSk6812SPI::write(const std::vector<ColorRgb> &ledValues)
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{
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mLedCount = ledValues.size();
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// 4 colours, 4 spi bytes per colour + 3 frame end latch bytes
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#define COLOURS_PER_LED 3
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#define SPI_BYTES_PER_COLOUR 4
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#define SPI_BYTES_PER_LED COLOURS_PER_LED * SPI_BYTES_PER_COLOUR
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unsigned spi_size = mLedCount * SPI_BYTES_PER_LED + 3;
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if(_spiBuffer.size() != spi_size){
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_spiBuffer.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< mLedCount; ++i) {
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uint8_t white = 0;
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uint32_t colorBits =
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((unsigned int)ledValues[i].red << 24) |
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((unsigned int)ledValues[i].green << 16) |
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((unsigned int)ledValues[i].blue << 8) |
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white;
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for (int j=SPI_BYTES_PER_LED - 1; j>=0; j--) {
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_spiBuffer[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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_spiBuffer[spi_ptr++] = 0;
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_spiBuffer[spi_ptr++] = 0;
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_spiBuffer[spi_ptr++] = 0;
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return writeBytes(spi_size, _spiBuffer.data());
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}
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int LedDeviceSk6812SPI::switchOff()
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{
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return write(std::vector<ColorRgb>(mLedCount, ColorRgb{0,0,0}));
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}
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