Fix #676 (#679) LedDevice Open() did not initialised the device correctly.

* Cast fix
* Fix #676

libsrc/leddevice/dev_rpi_pwm/LedDeviceWS281x.cpp

@@ -11,6 +11,11 @@ LedDeviceWS281x::~LedDeviceWS281x()
 {
 }
 
+LedDevice* LedDeviceWS281x::construct(const QJsonObject &deviceConfig)
+{
+	return new LedDeviceWS281x(deviceConfig);
+}
+
 bool LedDeviceWS281x::init(const QJsonObject &deviceConfig)
 {
 	QString errortext;
@@ -84,11 +89,6 @@ void LedDeviceWS281x::close()
 	}
 }
 
-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)
 {

libsrc/leddevice/dev_rpi_pwm/LedDeviceWS281x.h

@@ -15,12 +15,12 @@ public:
 	///
 	/// @param deviceConfig json device config
 	///
-	LedDeviceWS281x(const QJsonObject &deviceConfig);
+	explicit LedDeviceWS281x(const QJsonObject &deviceConfig);
 
 	///
 	/// Destructor of the LedDevice, waits for DMA to complete and then cleans up
 	///
-	~LedDeviceWS281x() override;
+	virtual ~LedDeviceWS281x() override;
 
 	/// constructs leddevice
 	static LedDevice* construct(const QJsonObject &deviceConfig);
@@ -30,7 +30,7 @@ public:
 	///
 	/// @param deviceConfig the json device config
 	/// @return true if success
-	bool init(const QJsonObject &deviceConfig) override;
+	virtual bool init(const QJsonObject &deviceConfig) override;
 
 public slots:
 	///
@@ -39,7 +39,7 @@ public slots:
 	///
 	virtual void close() override;
 
-private:
+protected:
 	///
 	/// Writes the led color values to the led-device
 	///
@@ -48,6 +48,8 @@ private:
 	///
 	virtual int write(const std::vector<ColorRgb> &ledValues) override;
 
+private:
+
 	ws2811_t    _led_string;
 	int         _channel;
 	RGBW::WhiteAlgorithm _whiteAlgorithm;