Added PiBlaster device

Former-commit-id: d8559d17a5c1496aa5274da2b56a3e7b45a6d1f9

libsrc/leddevice/LedDevicePiBlaster.h

@@ -0,0 +1,52 @@
+
+#pragma once
+
+// STL includes
+#include <cstdio>
+
+// Hyperion-Leddevice includes
+#include <leddevice/LedDevice.h>
+
+class LedDevicePiBlaster : public LedDevice
+{
+public:
+	///
+	/// Constructs the PiBlaster device which writes to the indicated device and for the assigned
+	/// channels
+	/// @param deviceName The name of the output device
+	/// @param channelAssignment The RGB-Channel assignment (8 characters long)
+	///
+	LedDevicePiBlaster(const std::string & deviceName, const std::string & channelAssignment);
+
+	virtual ~LedDevicePiBlaster();
+
+	int open();
+
+	///
+	/// Writes the colors to the PiBlaster device
+	///
+	/// @param ledValues The color value for each led
+	///
+	/// @return Zero on success else negative
+	///
+	int write(const std::vector<ColorRgb> &ledValues);
+
+	///
+	/// Switches off the leds
+	///
+	/// @return Zero on success else negative
+	///
+	int switchOff();
+
+private:
+
+	/// The name of the output device (very likely '/dev/pi-blaster')
+	const std::string _deviceName;
+
+	/// String with eight characters with the rgb-channel assignment per pwm-channel
+	/// ('r' = red, 'g' = green, 'b' = blue, ' ' = empty)
+	const std::string _channelAssignment;
+
+	/// File-Pointer to the PiBlaster device
+	FILE * _fid;
+};