hyperion.ng/libsrc/leddevice/dev_rpi_pwm/LedDeviceWS281x.cpp

#include "LedDeviceWS281x.h"

LedDeviceWS281x::LedDeviceWS281x(const QJsonObject &deviceConfig)
	: LedDevice()
{
	_devConfig = deviceConfig;
	_deviceReady = false;
}

LedDeviceWS281x::~LedDeviceWS281x()
{
}

bool LedDeviceWS281x::init(const QJsonObject &deviceConfig)
{
	QString errortext;

	bool isInitOK = LedDevice::init(deviceConfig);
	if ( isInitOK )
	{

		QString whiteAlgorithm = deviceConfig["whiteAlgorithm"].toString("white_off");

		_whiteAlgorithm	= RGBW::stringToWhiteAlgorithm(whiteAlgorithm);
		if (_whiteAlgorithm == RGBW::INVALID)
		{
			errortext = QString ("unknown whiteAlgorithm: %1").arg(whiteAlgorithm);
			isInitOK = false;
		}
		else
		{
			_channel = deviceConfig["pwmchannel"].toInt(0);
			if (_channel != 0 && _channel != 1)
			{
				errortext = "WS281x: invalid PWM channel; must be 0 or 1.";
				isInitOK = false;
			}
			else
			{
				memset(&_led_string, 0, sizeof(_led_string));
				_led_string.freq   = deviceConfig["freq"].toInt(800000ul);
				_led_string.dmanum = deviceConfig["dma"].toInt(5);
				_led_string.channel[_channel].gpionum    = deviceConfig["gpio"].toInt(18);
				_led_string.channel[_channel].count      = deviceConfig["leds"].toInt(256);
				_led_string.channel[_channel].invert     = deviceConfig["invert"].toInt(0);
				_led_string.channel[_channel].strip_type = (deviceConfig["rgbw"].toBool(false) ? SK6812_STRIP_GRBW : WS2811_STRIP_RGB);
				_led_string.channel[_channel].brightness = 255;

				_led_string.channel[!_channel].gpionum = 0;
				_led_string.channel[!_channel].invert = _led_string.channel[_channel].invert;
				_led_string.channel[!_channel].count = 0;
				_led_string.channel[!_channel].brightness = 0;
				_led_string.channel[!_channel].strip_type = WS2811_STRIP_RGB;

				Debug( _log, "ws281x strip type : %d", _led_string.channel[_channel].strip_type );

				if (ws2811_init(&_led_string) < 0)
				{
					errortext = "Unable to initialize ws281x library.";
					isInitOK = false;
				}
				else
				{
					isInitOK = true;
				}
			}
		}
	}

	if ( !isInitOK)
	{
		this->setInError(errortext);
	}
	return isInitOK;
}

void LedDeviceWS281x::close()
{
	LedDevice::close();

	if (_deviceReady)
	{
		ws2811_fini(&_led_string);
	}
}

LedDevice* LedDeviceWS281x::construct(const QJsonObject &deviceConfig)
{
	return new LedDeviceWS281x(deviceConfig);
}

// Send new values down the LED chain
int LedDeviceWS281x::write(const std::vector<ColorRgb> &ledValues)
{
	int idx = 0;
	for (const ColorRgb& color : ledValues)
	{
		if (idx >= _led_string.channel[_channel].count)
		{
			break;
		}

		_temp_rgbw.red = color.red;
		_temp_rgbw.green = color.green;
		_temp_rgbw.blue = color.blue;
		_temp_rgbw.white = 0;

		if (_led_string.channel[_channel].strip_type == SK6812_STRIP_GRBW)
		{
			Rgb_to_Rgbw(color, &_temp_rgbw, _whiteAlgorithm);
		}

		_led_string.channel[_channel].leds[idx++] = 
			((uint32_t)_temp_rgbw.white << 24) + ((uint32_t)_temp_rgbw.red << 16) + ((uint32_t)_temp_rgbw.green << 8) + _temp_rgbw.blue;

	}
	while (idx < _led_string.channel[_channel].count)
	{
		_led_string.channel[_channel].leds[idx++] = 0;
	}
	
	return ws2811_render(&_led_string) ? -1 : 0;
}