Final adjustments for APA102 via Adalight

Author: tociek

libsrc/leddevice/LedDeviceAdalightApa102.cpp

@@ -0,0 +1,53 @@
+
+// STL includes
+#include <cstring>
+#include <cstdio>
+#include <iostream>
+
+// Linux includes
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+// hyperion local includes
+#include "LedDeviceAdalightApa102.h"
+
+LedDeviceAdalightApa102::LedDeviceAdalightApa102(const std::string& outputDevice, const unsigned baudrate, int delayAfterConnect_ms) :
+	LedDeviceAdalight(outputDevice, baudrate, delayAfterConnect_ms),
+	_ledBuffer(0),
+	_timer()
+{
+}
+//comparing to ws2801 adalight, the following changes were needed:
+// 1- differnt data frame (4 bytes instead of 3)
+// 2 - in order to accomodate point 1 above, number of leds sent to adalight is increased by 1/3rd
+int LedDeviceAdalightApa102::write(const std::vector<ColorRgb> & ledValues)
+{
+	const unsigned int startFrameSize = 4;
+	const unsigned int endFrameSize = (ledValues.size() + 63) / 64 * 4;
+	const unsigned int mLedCount = (ledValues.size() * 4) + startFrameSize + endFrameSize;
+	if(_ledBuffer.size() != mLedCount){
+		_ledBuffer.resize(mLedCount, 0x00);
+		_ledBuffer[0] = 'A';
+		_ledBuffer[1] = 'd';
+		_ledBuffer[2] = 'a';
+		_ledBuffer[3] = (((unsigned int)(ledValues.size() * 1.33) - 1) >> 8) & 0xFF; // LED count high byte
+		_ledBuffer[4] = ((unsigned int)(ledValues.size() * 1.33) - 1) & 0xFF;        // LED count low byte
+		_ledBuffer[5] = _ledBuffer[3] ^ _ledBuffer[4] ^ 0x55; // Checksum
+	}
+	
+	for (unsigned iLed=1; iLed<=ledValues.size(); iLed++) {
+		const ColorRgb& rgb = ledValues[iLed];
+		_ledBuffer[iLed*4+6]   = 0xFF;
+		_ledBuffer[iLed*4+1+6] = rgb.red;
+		_ledBuffer[iLed*4+2+6] = rgb.green;
+		_ledBuffer[iLed*4+3+6] = rgb.blue;
+	}
+	
+	// restart the timer
+	_timer.start();
+
+	// write data
+	return writeBytes(_ledBuffer.size(), _ledBuffer.data());
+}
+
+

libsrc/leddevice/LedDeviceAdalightApa102.h

@@ -10,7 +10,7 @@
 #include "LedDeviceAdalight.h"
 
 ///
-/// Implementation of the LedDevice interface for writing to an Adalight led device for APA102 led strips.
+/// Implementation of the LedDevice interface for writing to an Adalight led device for APA102.
 ///
 class LedDeviceAdalightApa102 : public LedDeviceAdalight
 {
@@ -33,4 +33,14 @@ class LedDeviceAdalightApa102 : public LedDeviceAdalight
 	///
 	virtual int write(const std::vector<ColorRgb> & ledValues);
 
+
+
+private:
+	/// The buffer containing the packed RGB values
+	std::vector<uint8_t> _ledBuffer;
+
+	/// Timer object which makes sure that led data is written at a minimum rate
+	/// The Adalight device will switch off when it does not receive data at least
+	/// every 15 seconds
+	QTimer _timer;
 };