[examples] Add WS2812 example

examples/README.md

@@ -94,7 +94,7 @@ make gdb
 
 ## Interesting Examples
 
-We have a lot of examples, <!--examplecount-->169<!--/examplecount--> to be
+We have a lot of examples, <!--examplecount-->170<!--/examplecount--> to be
 exact, but here are some of our favorite examples for our supported development
 boards:
 

examples/nucleo_f411re/ws2812b/main.cpp

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2019, Niklas Hauser
+ *
+ * This file is part of the modm project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+// ----------------------------------------------------------------------------
+
+#include <modm/board.hpp>
+#include <modm/driver/pwm/ws2812b.hpp>
+#include <modm/ui/led/tables.hpp>
+#include <modm/processing/timer.hpp>
+
+using namespace Board;
+
+using Output = Board::D11;
+modm::Ws2812b<SpiMaster1, Output, 8*8> leds;
+modm::ShortPeriodicTimer tmr{33};
+
+int
+main()
+{
+	Board::initialize();
+	LedD13::setOutput();
+	leds.initialize<Board::SystemClock>();
+
+	constexpr uint8_t max = 62;
+	uint8_t r=0, g=max/3, b=max/3*2;
+
+	while (1)
+	{
+		for (size_t ii=0; ii < leds.size; ii++)
+		{
+			leds.setColor(ii,
+						  modm::ui::table22_8_256[r*3/2],
+						  modm::ui::table22_8_256[g*3/2],
+						  modm::ui::table22_8_256[b*3/2]);
+			if (r++ >= max) r = 0;
+			if (g++ >= max) g = 0;
+			if (b++ >= max) b = 0;
+		}
+		leds.write();
+
+		while(not tmr.execute()) ;
+		LedD13::toggle();
+	}
+
+	return 0;
+}

examples/nucleo_f411re/ws2812b/project.xml

@@ -0,0 +1,13 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<library>
+  <extends>modm:nucleo-f411re</extends>
+  <options>
+    <option name=":build:build.path">../../../build/nucleo_f411re/ws2812b</option>
+  </options>
+  <modules>
+    <module>:driver:ws2812</module>
+    <module>:platform:spi:1</module>
+    <module>:ui:led</module>
+    <module>:build:scons</module>
+  </modules>
+</library>