Add sk6812rgbw support (#666)

* 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

* adding support for SK6812 - not working yet

* Changed rpi_ws281x submodule to be penfold42's fork

* Set White to zero for now

* starting on the code to make the White led do stuff

* Added some basic whie led calculation
white = min(r,g,b)
r-=w, g-=w, b-=w

* cleaned up a couple of compiler warnings

* updated strip type to use corrected RGBW strip type
(the SK6812RGBW datasheet is wrong)

* 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

* moved rpi_281x to tag sk6812-v1.0

* attempt #3 at migrating the rpi_281x submodule to my fork/branch

* moving to my fork of rpi_281x

* Started implementing multiple RGB to RGBW conversion options

a quick hack has been implemented inside WS281x.cpp but ive started
moving this to RgbToRgbw.cpp for reuse by other led device types

* migrated RGB to RGBW conversion to RgbToRgbw.cpp


Former-commit-id: ff8e9038c4bb8203b71b42d12bf23be4abcc0b3b

.gitmodules

@@ -3,4 +3,5 @@
 	url = https://github.com/tvdzwan/protobuf.git
 [submodule "dependencies/external/rpi_ws281x"]
 	path = dependencies/external/rpi_ws281x
-	url = https://github.com/penfold42/rpi_ws281x
+	url = https://github.com/penfold42/rpi_ws281x.git
+	branch = sk6812

include/leddevice/LedDevice.h

@@ -5,6 +5,8 @@
 
 // Utility includes
 #include <utils/ColorRgb.h>
+#include <utils/ColorRgbw.h>
+#include <utils/RgbToRgbw.h>
 
 ///
 /// Interface (pure virtual base class) for LedDevices.

include/utils/ColorRgbw.h

@@ -0,0 +1,65 @@
+#pragma once
+
+// STL includes
+#include <cstdint>
+#include <iostream>
+
+struct ColorRgbw;
+
+///
+/// Plain-Old-Data structure containing the red-green-blue color specification. Size of the
+/// structure is exactly 3-bytes for easy writing to led-device
+///
+struct ColorRgbw
+{
+	/// The red color channel
+	uint8_t red;
+	/// The green color channel
+	uint8_t green;
+	/// The blue color channel
+	uint8_t blue;
+	/// The white color channel
+	uint8_t white;
+
+	/// 'Black' RgbColor (0, 0, 0, 0)
+	static ColorRgbw BLACK;
+	/// 'Red' RgbColor (255, 0, 0, 0)
+	static ColorRgbw RED;
+	/// 'Green' RgbColor (0, 255, 0, 0)
+	static ColorRgbw GREEN;
+	/// 'Blue' RgbColor (0, 0, 255, 0)
+	static ColorRgbw BLUE;
+	/// 'Yellow' RgbColor (255, 255, 0, 0)
+	static ColorRgbw YELLOW;
+	/// 'White' RgbColor (0, 0, 0, 255)
+	static ColorRgbw WHITE;
+};
+
+/// Assert to ensure that the size of the structure is 'only' 4 bytes
+static_assert(sizeof(ColorRgbw) == 4, "Incorrect size of ColorRgbw");
+
+///
+/// Stream operator to write ColorRgb to an outputstream (format "'{'[red]','[green]','[blue]'}'")
+///
+/// @param os The output stream
+/// @param color The color to write
+/// @return The output stream (with the color written to it)
+///
+inline std::ostream& operator<<(std::ostream& os, const ColorRgbw& color)
+{
+	os << "{" << unsigned(color.red) << "," << unsigned(color.green) << "," << unsigned(color.blue) << "," << unsigned(color.white) << "}";
+	return os;
+}
+
+
+/// Compare operator to check if a color is 'smaller' than another color
+inline bool operator<(const ColorRgbw & lhs, const ColorRgbw & rhs)
+{
+	return (lhs.red < rhs.red) && (lhs.green < rhs.green) && (lhs.blue < rhs.blue) && (lhs.white < rhs.white);
+}
+
+/// Compare operator to check if a color is 'smaller' than or 'equal' to another color
+inline bool operator<=(const ColorRgbw & lhs, const ColorRgbw & rhs)
+{
+	return (lhs.red <= rhs.red) && (lhs.green <= rhs.green) && (lhs.blue <= rhs.blue) && (lhs.white < rhs.white);
+}

include/utils/RgbToRgbw.h

@@ -0,0 +1,4 @@
+#include <utils/ColorRgb.h>
+#include <utils/ColorRgbw.h>
+
+void Rgb_to_Rgbw(ColorRgb input, ColorRgbw * output, std::string _whiteAlgorithm);

libsrc/leddevice/LedDeviceFactory.cpp

@@ -363,8 +363,11 @@ LedDevice * LedDeviceFactory::construct(const Json::Value & deviceConfig)
 		const int dmanum = deviceConfig.get("dmanum", 5).asInt();
                 const int pwmchannel = deviceConfig.get("pwmchannel", 0).asInt();
 		const int invert = deviceConfig.get("invert", 0).asInt();
+		const int rgbw = deviceConfig.get("rgbw", 0).asInt();
+		const std::string& whiteAlgorithm = deviceConfig.get("white_algorithm","").asString();
 
-		LedDeviceWS281x * ledDeviceWS281x = new LedDeviceWS281x(gpio, leds, freq, dmanum, pwmchannel, invert);
+		LedDeviceWS281x * ledDeviceWS281x = new LedDeviceWS281x(gpio, leds, freq, dmanum, pwmchannel, invert, 
+			rgbw, whiteAlgorithm);
 		device = ledDeviceWS281x;
 	}
 #endif

libsrc/leddevice/LedDeviceWS281x.cpp

@@ -3,8 +3,11 @@
 #include "LedDeviceWS281x.h"
 
 // Constructor
-LedDeviceWS281x::LedDeviceWS281x(const int gpio, const int leds, const uint32_t freq, const int dmanum, const int pwmchannel, const int invert)
+LedDeviceWS281x::LedDeviceWS281x(const int gpio, const int leds, const uint32_t freq, const int dmanum, const int pwmchannel, const int invert, const int rgbw, const std::string& whiteAlgorithm)
 {
+	_whiteAlgorithm = whiteAlgorithm;
+std::cout << "whiteAlgorithm :" << whiteAlgorithm << ":\n";
+
 	initialized = false;
 	led_string.freq = freq;
 	led_string.dmanum = dmanum;
@@ -17,7 +20,11 @@ LedDeviceWS281x::LedDeviceWS281x(const int gpio, const int leds, const uint32_t
 	led_string.channel[chan].invert = invert;
 	led_string.channel[chan].count = leds;
 	led_string.channel[chan].brightness = 255;
+	if (rgbw == 1) {
+		led_string.channel[chan].strip_type = SK6812_STRIP_GRBW;
+	} else {
 		led_string.channel[chan].strip_type = WS2811_STRIP_RGB;
+	}
 
 	led_string.channel[!chan].gpionum = 0;
 	led_string.channel[!chan].invert = invert;
@@ -42,7 +49,19 @@ int LedDeviceWS281x::write(const std::vector<ColorRgb> &ledValues)
 	{
 		if (idx >= led_string.channel[chan].count)
 			break;
-		led_string.channel[chan].leds[idx++] = ((uint32_t)color.red << 16) + ((uint32_t)color.green << 8) + color.blue;
+
+		_temp_rgbw.red = color.red;
+		_temp_rgbw.green = color.green;
+		_temp_rgbw.blue = color.blue;
+		_temp_rgbw.white = 0;
+
+		if (led_string.channel[chan].strip_type == SK6812_STRIP_GRBW) {
+			Rgb_to_Rgbw(color, &_temp_rgbw, _whiteAlgorithm);
+		}
+
+		led_string.channel[chan].leds[idx++] = 
+			((uint32_t)_temp_rgbw.white << 24) + ((uint32_t)_temp_rgbw.red << 16) + ((uint32_t)_temp_rgbw.green << 8) + _temp_rgbw.blue;
+
 	}
 	while (idx < led_string.channel[chan].count)
 		led_string.channel[chan].leds[idx++] = 0;

libsrc/leddevice/LedDeviceWS281x.h

@@ -18,9 +18,11 @@ public:
 	/// @param dmanum The DMA channel to use, default is 5
 	/// @param pwmchannel The pwm channel to use
 	/// @param invert Invert the output line to support an inverting level shifter
+	/// @param rgbw   Send 32 bit rgbw colour data for sk6812
 
 	///
-	LedDeviceWS281x(const int gpio, const int leds, const uint32_t freq, int dmanum, int pwmchannel, int invert);
+	LedDeviceWS281x(const int gpio, const int leds, const uint32_t freq, int dmanum, int pwmchannel, int invert, 
+		int rgbw, const std::string& whiteAlgorithm);
 
 	///
 	/// Destructor of the LedDevice, waits for DMA to complete and then cleans up
@@ -42,6 +44,8 @@ private:
 	ws2811_t led_string;
 	int chan;
 	bool initialized;
+        std::string _whiteAlgorithm;
+	ColorRgbw _temp_rgbw;
 };
 
 #endif /* LEDDEVICEWS281X_H_ */

libsrc/utils/CMakeLists.txt

@@ -1,4 +1,3 @@
-
 # Define the current source locations
 SET(CURRENT_HEADER_DIR ${CMAKE_SOURCE_DIR}/include/utils)
 SET(CURRENT_SOURCE_DIR ${CMAKE_SOURCE_DIR}/libsrc/utils)
@@ -12,6 +11,8 @@ add_library(hyperion-utils
 	${CURRENT_SOURCE_DIR}/ColorRgb.cpp
 	${CURRENT_HEADER_DIR}/ColorRgba.h
 	${CURRENT_SOURCE_DIR}/ColorRgba.cpp
+	${CURRENT_HEADER_DIR}/ColorRgbw.h
+	${CURRENT_SOURCE_DIR}/ColorRgbw.cpp
 	${CURRENT_HEADER_DIR}/Image.h
 	${CURRENT_HEADER_DIR}/Sleep.h
 
@@ -32,6 +33,9 @@ add_library(hyperion-utils
 	${CURRENT_HEADER_DIR}/RgbChannelAdjustment.h
 	${CURRENT_SOURCE_DIR}/RgbChannelAdjustment.cpp
 
+	${CURRENT_HEADER_DIR}/RgbToRgbw.h
+	${CURRENT_SOURCE_DIR}/RgbToRgbw.cpp
+
 	${CURRENT_HEADER_DIR}/jsonschema/JsonFactory.h
 	${CURRENT_HEADER_DIR}/jsonschema/JsonSchemaChecker.h
 	${CURRENT_SOURCE_DIR}/jsonschema/JsonSchemaChecker.cpp

libsrc/utils/ColorRgbw.cpp

@@ -0,0 +1,10 @@
+
+// Local includes
+#include <utils/ColorRgbw.h>
+
+ColorRgbw ColorRgbw::BLACK = {   0,   0,   0,   0 };
+ColorRgbw ColorRgbw::RED   = { 255,   0,   0,   0 };
+ColorRgbw ColorRgbw::GREEN = {   0, 255,   0,   0 };
+ColorRgbw ColorRgbw::BLUE  = {   0,   0, 255,   0 };
+ColorRgbw ColorRgbw::YELLOW= { 255, 255,   0,   0 };
+ColorRgbw ColorRgbw::WHITE = {   0,   0,   0, 255 };

libsrc/utils/RgbToRgbw.cpp

@@ -0,0 +1,24 @@
+#include <utils/ColorRgb.h>
+#include <utils/ColorRgbw.h>
+
+void Rgb_to_Rgbw(ColorRgb input, ColorRgbw * output, std::string _whiteAlgorithm) {
+	if (_whiteAlgorithm == "subtract_minimum") {
+		output->white = std::min(input.red, input.green);
+		output->white = std::min(output->white, input.blue);
+		output->red = input.red - output->white;
+		output->green = input.green - output->white;
+		output->blue = input.blue - output->white;
+	}
+	else if (_whiteAlgorithm == "sub_min_warm_adjust") {
+	}
+	else if ( (_whiteAlgorithm == "") || (_whiteAlgorithm == "white_off") ) {
+		output->red = input.red;
+		output->green = input.green;
+		output->blue = input.blue;
+		output->white = 0;
+	}
+	else {
+		std::cout << "ERROR: unknown whiteAlgorithm " << _whiteAlgorithm << std::endl;
+	}
+}
+