fix LedDeviceWs2812SPI to compile on gcc 4.6 (#643)

* 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

* cleaned up a couple of compiler warnings

* moved bitpair_to_byte initialiser to (hopefully) work with older GCC

* compiler warning in udp driver
removed some tabs in ws2812b.cpp

* formatting - spaces to tabs


Former-commit-id: 42cc7325177c9fcc3d1bd29cbfe72f02118d3233

libsrc/leddevice/LedDevicePiBlaster.cpp

@@ -27,7 +27,7 @@ LedDevicePiBlaster::LedDevicePiBlaster(const std::string & deviceName, const Jso
 // { "gpio" : 4, "ledindex" : 0, "ledcolor" : "r" },
 	#define TABLE_SZ sizeof(_gpio_to_led)/sizeof(_gpio_to_led[0])
 
-	for (int i=0; i <  TABLE_SZ; i++ )
+	for (unsigned i=0; i <  TABLE_SZ; i++ )
 	{
 		_gpio_to_led[i] = -1;
 		_gpio_to_color[i] = 'z';
@@ -41,7 +41,7 @@ LedDevicePiBlaster::LedDevicePiBlaster(const std::string & deviceName, const Jso
 		const std::string ledcolor = gpioMap.get("ledcolor","z").asString();
 //		printf ("got gpio %d ledindex %d color %c\n", gpio,ledindex, ledcolor[0]);
 		// ignore missing/invalid settings
-		if ( (gpio >= 0) && (gpio < TABLE_SZ) && (ledindex >= 0) ){
+		if ( (gpio >= 0) && (gpio < signed(TABLE_SZ)) && (ledindex >= 0) ){
 			_gpio_to_led[gpio] = ledindex;
 			_gpio_to_color[gpio] = ledcolor[0]; // 1st char of string
 		} else {

libsrc/leddevice/LedDeviceUdp.cpp

@@ -17,7 +17,7 @@ struct addrinfo hints, *servinfo, *p;
 //char udpbuffer[1024];
 int sockfd;
 int ledprotocol;
-int leds_per_pkt;
+unsigned leds_per_pkt;
 int update_number;
 int fragment_number;
 

libsrc/leddevice/LedDeviceWs2812SPI.cpp

@@ -13,7 +13,14 @@
 
 LedDeviceWs2812SPI::LedDeviceWs2812SPI(const std::string& outputDevice, const unsigned baudrate) :
 	LedSpiDevice(outputDevice, baudrate, 0),
-	mLedCount(0)
+	mLedCount(0),
+	bitpair_to_byte {
+		0b10001000,
+		0b10001100,
+		0b11001000,
+		0b11001100,
+	}
+
 {
 	// empty
 }

libsrc/leddevice/LedDeviceWs2812SPI.h

@@ -42,11 +42,5 @@ private:
 	size_t mLedCount;
 	std::vector<uint8_t> _spiBuffer;
 
-        uint8_t bitpair_to_byte[4] = {
-                0b10001000,
-                0b10001100,
-                0b11001000,
-                0b11001100,
-        };
-
+        uint8_t bitpair_to_byte[4];
 };