Leddevices source tree refactoring (#461)

* rework structure of leddevice source tree

* fix data type vor v4l sig detection value in webui

* automate leddevicefactory.cpp

libsrc/leddevice/dev_spi/LedDeviceLpd8806.cpp

@@ -0,0 +1,41 @@
+#include "LedDeviceLpd8806.h"
+
+LedDeviceLpd8806::LedDeviceLpd8806(const QJsonObject &deviceConfig)
+	: ProviderSpi()
+{
+	_deviceReady = init(deviceConfig);
+}
+
+LedDevice* LedDeviceLpd8806::construct(const QJsonObject &deviceConfig)
+{
+	return new LedDeviceLpd8806(deviceConfig);
+}
+
+bool LedDeviceLpd8806::init(const QJsonObject &deviceConfig)
+{
+	ProviderSpi::init(deviceConfig);
+
+	const unsigned clearSize = _ledCount/32+1;
+	unsigned messageLength = _ledRGBCount + clearSize;
+	// Initialise the buffer
+	_ledBuffer.resize(messageLength, 0x00);
+
+	// Perform an initial reset to start accepting data on the first led
+	return writeBytes(clearSize, _ledBuffer.data());
+}
+
+int LedDeviceLpd8806::write(const std::vector<ColorRgb> &ledValues)
+{
+	// Copy the colors from the ColorRgb vector to the Ldp8806 data vector
+	for (unsigned iLed=0; iLed<(unsigned)_ledCount; ++iLed)
+	{
+		const ColorRgb& color = ledValues[iLed];
+
+		_ledBuffer[iLed*3]   = 0x80 | (color.red   >> 1);
+		_ledBuffer[iLed*3+1] = 0x80 | (color.green >> 1);
+		_ledBuffer[iLed*3+2] = 0x80 | (color.blue  >> 1);
+	}
+
+	// Write the data
+	return writeBytes(_ledBuffer.size(), _ledBuffer.data());
+}