Apa102 fix if the led strip has more physical LEDs than you want to configure with hyperion (#626)

* Removed -HUP so the default -TERM signal is sent instead.
- hyperiond only listens for TERM and INT. HUP is often used to get an exe to reread its config

Changed pgrep to add '-x' so it wont partial match on the exe name.
- I have multiple instances with multiple hyperiond-instance1 names
- this ensures the service script only kills the right process

* reversing errant change to hyperion.systemd.sh

* started bug fixes for APA strips with more physical leds than configured

* 1st cut of changes to APA102.

now looks at config for "leds" which is the # of hardware leds in the strip.
This enables us to write the correct trailer length in the packet.

Also fixed a bug where switchoff was writing the wrong # of leds

* removed commented out old code

removed debug printf

* included prebuild test binary for Pi2

* Second attempt at the fix.
BEFORE:
If you have more physcial LEDs than defined in the "leds" "index" section of the config there is random junk added to the end of the strip.

WITH THIS FIX:
In the "device" section specify the number of physical leds with:
 "leds" : 212,
If this is greater than the number of led indexes, additional LEDs are set to black
If this is smaller than the number of led indexes, it is ignored

* included test binary

* Clean exit if the device config is missing or a non-supported device type is specified

Former-commit-id: 8ae96188fa74d91b13a921e7d5faf6d6ac1c42ee

dependencies/external/rpi_ws281x

@@ -1 +1 @@
-Subproject commit e053bc9be127d1f4f0cffd10e7892cd32657ecf7
+Subproject commit f82fa85f26c9ee10210469e61315d9c0182a2b81

hyperiond.test-binary.REMOVED.git-id

@@ -0,0 +1 @@
+5d75f380f2bd74d3cd6b574f0a7d05850786216b

libsrc/leddevice/LedDeviceAPA102.cpp

@@ -12,38 +12,61 @@
 // hyperion local includes
 #include "LedDeviceAPA102.h"
 
-LedDeviceAPA102::LedDeviceAPA102(const std::string& outputDevice, const unsigned baudrate) :
+LedDeviceAPA102::LedDeviceAPA102(const std::string& outputDevice, const unsigned baudrate, const unsigned ledcount) :
 	LedSpiDevice(outputDevice, baudrate, 500000),
 	_ledBuffer(0)
 {
-	// empty
+	_HW_ledcount = ledcount;
 }
 
 int LedDeviceAPA102::write(const std::vector<ColorRgb> &ledValues)
 {
+	_mLedCount = ledValues.size();
+	const unsigned int max_leds = std::max(_mLedCount, _HW_ledcount);
 	const unsigned int startFrameSize = 4;
-	const unsigned int endFrameSize = std::max<unsigned int>(((ledValues.size() + 15) / 16), 4);
+	const unsigned int endFrameSize = std::max<unsigned int>(((max_leds + 15) / 16), 4);
-	const unsigned int mLedCount = (ledValues.size() * 4) + startFrameSize + endFrameSize;
+	const unsigned int APAbufferSize = (max_leds * 4) + startFrameSize + endFrameSize;
-	if(_ledBuffer.size() != mLedCount){
+
-		_ledBuffer.resize(mLedCount, 0xFF);
+//printf ("_mLedCount %d _HW_ledcount %d max_leds %d APAbufferSize %d\n",
+//	_mLedCount, _HW_ledcount, max_leds, APAbufferSize);
+
+	if(_ledBuffer.size() != APAbufferSize){
+		_ledBuffer.resize(APAbufferSize, 0xFF);
 		_ledBuffer[0] = 0x00; 
 		_ledBuffer[1] = 0x00; 
 		_ledBuffer[2] = 0x00; 
 		_ledBuffer[3] = 0x00; 
 	}
 	
-	for (unsigned iLed=1; iLed<=ledValues.size(); ++iLed) {
+	unsigned iLed=0;
-		const ColorRgb& rgb = ledValues[iLed-1];
+	for (iLed=0; iLed < _mLedCount; ++iLed) {
-		_ledBuffer[iLed*4]   = 0xFF;
+		const ColorRgb& rgb = ledValues[iLed];
-		_ledBuffer[iLed*4+1] = rgb.red;
+		_ledBuffer[4+iLed*4]   = 0xFF;
-		_ledBuffer[iLed*4+2] = rgb.green;
+		_ledBuffer[4+iLed*4+1] = rgb.red;
-		_ledBuffer[iLed*4+3] = rgb.blue;
+		_ledBuffer[4+iLed*4+2] = rgb.green;
+		_ledBuffer[4+iLed*4+3] = rgb.blue;
 	}
 
+	for ( ; iLed < max_leds; ++iLed) {
+		_ledBuffer[4+iLed*4]   = 0xFF;
+		_ledBuffer[4+iLed*4+1] = 0x00;
+		_ledBuffer[4+iLed*4+2] = 0x00;
+		_ledBuffer[4+iLed*4+3] = 0x00;
+	}
+
+/*
+for (unsigned i=0; i< _ledBuffer.size(); i+=4) {
+	printf ("i %2d led %2d RGB 0x0%02x%02x%02x%02x\n",i, i/4-1,
+		_ledBuffer[i+0],
+		_ledBuffer[i+1],
+		_ledBuffer[i+2],
+		_ledBuffer[i+3]);
+}
+*/
 	return writeBytes(_ledBuffer.size(), _ledBuffer.data());
 }
 
 int LedDeviceAPA102::switchOff()
 {
-	return write(std::vector<ColorRgb>(_ledBuffer.size(), ColorRgb{0,0,0}));
+	return write(std::vector<ColorRgb>(_mLedCount, ColorRgb{0,0,0}));
 }

libsrc/leddevice/LedDeviceAPA102.h

@@ -21,7 +21,8 @@ public:
 	/// @param baudrate The used baudrate for writing to the output device
 	///
 	LedDeviceAPA102(const std::string& outputDevice,
-					const unsigned baudrate);
+					const unsigned baudrate, const unsigned ledcount );
+
 
 	///
 	/// Writes the led color values to the led-device
@@ -38,5 +39,7 @@ private:
 
 	/// The buffer containing the packed RGB values
 	std::vector<uint8_t> _ledBuffer;
+	unsigned int _HW_ledcount;
+	unsigned int _mLedCount;
 
 };

libsrc/leddevice/LedDeviceFactory.cpp

@@ -124,8 +124,9 @@ LedDevice * LedDeviceFactory::construct(const Json::Value & deviceConfig)
 	{
 		const std::string output = deviceConfig["output"].asString();
 		const unsigned rate      = deviceConfig["rate"].asInt();
+		const unsigned ledcount  = deviceConfig.get("leds",0).asInt();
 
-		LedDeviceAPA102* deviceAPA102 = new LedDeviceAPA102(output, rate);
+		LedDeviceAPA102* deviceAPA102 = new LedDeviceAPA102(output, rate, ledcount);
 		deviceAPA102->open();
 
 		device = deviceAPA102;
@@ -349,6 +350,7 @@ LedDevice * LedDeviceFactory::construct(const Json::Value & deviceConfig)
 	{
 		std::cout << "LEDDEVICE ERROR: Unknown/Unimplemented device " << type << std::endl;
 		// Unknown / Unimplemented device
+		exit(1);
 	}
 	return device;
 }