hyperion.ng/libsrc/leddevice/LedDeviceSk6812SPI.cpp

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// STL includes
#include <cstring>
#include <cstdio>
#include <iostream>
// Linux includes
#include <fcntl.h>
#include <sys/ioctl.h>
// hyperion local includes
#include "LedDeviceSk6812SPI.h"
LedDeviceSk6812SPI::LedDeviceSk6812SPI(const Json::Value &deviceConfig)
: ProviderSpi(deviceConfig)
, bitpair_to_byte {
0b10001000,
0b10001100,
0b11001000,
0b11001100,
}
{
setConfig(deviceConfig);
Debug( _log, "whiteAlgorithm : %s", _whiteAlgorithm.c_str());
}
LedDevice* LedDeviceSk6812SPI::construct(const Json::Value &deviceConfig)
{
return new LedDeviceSk6812SPI(deviceConfig);
}
bool LedDeviceSk6812SPI::setConfig(const Json::Value &deviceConfig)
{
ProviderSpi::setConfig(deviceConfig);
_baudRate_Hz = deviceConfig.get("rate",3000000).asInt();
if ( (_baudRate_Hz < 2050000) || (_baudRate_Hz > 4000000) )
{
Warning(_log, "SPI rate %d outside recommended range (2050000 -> 4000000)", _baudRate_Hz);
}
_whiteAlgorithm = deviceConfig.get("white_algorithm","").asString();
return true;
}
int LedDeviceSk6812SPI::write(const std::vector<ColorRgb> &ledValues)
{
_ledCount = ledValues.size();
// 4 colours, 4 spi bytes per colour + 3 frame end latch bytes
#define COLOURS_PER_LED 4
#define SPI_BYTES_PER_COLOUR 4
#define SPI_BYTES_PER_LED COLOURS_PER_LED * SPI_BYTES_PER_COLOUR
unsigned spi_size = _ledCount * SPI_BYTES_PER_LED + 3;
if(_ledBuffer.size() != spi_size){
_ledBuffer.resize(spi_size, 0x00);
}
unsigned spi_ptr = 0;
for (const ColorRgb& color : ledValues) {
Rgb_to_Rgbw(color, &_temp_rgbw, _whiteAlgorithm);
uint32_t colorBits =
((uint32_t)_temp_rgbw.red << 24) +
((uint32_t)_temp_rgbw.green << 16) +
((uint32_t)_temp_rgbw.blue << 8) +
_temp_rgbw.white;
for (int j=SPI_BYTES_PER_LED - 1; j>=0; j--) {
_ledBuffer[spi_ptr+j] = bitpair_to_byte[ colorBits & 0x3 ];
colorBits >>= 2;
}
spi_ptr += SPI_BYTES_PER_LED;
}
_ledBuffer[spi_ptr++] = 0;
_ledBuffer[spi_ptr++] = 0;
_ledBuffer[spi_ptr++] = 0;
return writeBytes(spi_size, _ledBuffer.data());
}
int LedDeviceSk6812SPI::switchOff()
{
return write(std::vector<ColorRgb>(_ledCount, ColorRgb{0,0,0}));
}