tests/sys_arduino_lib: demo the use of Arduino library

This test application defines a packages which imports a very simple Arduino library that is used by test application to demonstrate how an Arduino library can be imported as package and used by an application.

pkg/talking_leds/Makefile

@@ -0,0 +1,11 @@
+PKG_NAME=talking_leds
+PKG_URL=https://github.com/fabriziop/TalkingLED
+PKG_VERSION=8ae4f2d0b736aa338f24e097dbaf876fbb385dbd
+PKG_LICENSE=MIT
+
+.PHONY: all
+
+all:
+	"$(MAKE)" -C $(PKG_BUILDDIR)/src -f $(CURDIR)/Makefile.talking_leds
+
+include $(RIOTBASE)/pkg/pkg.mk

pkg/talking_leds/Makefile.dep

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+USEMODULE += arduino

pkg/talking_leds/Makefile.include

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+INCLUDES += -I$(PKGDIRBASE)/talking_leds/src
+
+CXXEXFLAGS += -std=c++11

pkg/talking_leds/Makefile.talking_leds

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+MODULE = talking_leds
+
+include $(RIOTBASE)/Makefile.base

pkg/talking_leds/doc.txt

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+/**
+ * @defgroup pkg_talking_leds Talking LEDs - Arduino library for demonstration
+ * @ingroup  pkg
+ * @brief    Demonstrates the usage of Arduino libraries as packages
+ * @see      https://github.com/fabriziop/TalkingLED
+ */

tests/sys_arduino_lib/Makefile

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+include ../Makefile.tests_common
+
+USEPKG += talking_leds
+
+include $(RIOTBASE)/Makefile.include

tests/sys_arduino_lib/Makefile.ci

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+BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-leonardo \
+    arduino-nano \
+    arduino-uno \
+    nucleo-f031k6 \
+    #

tests/sys_arduino_lib/main.cpp

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+/*
+ * Copyright (C) 2019 Gunar Schorcht
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup tests
+ * @{
+ *
+ * @file
+ * @brief    Demonstrates the use of an Arduino library imported as package
+ *
+ * @author   Gunar Schorcht <gunar@schorcht.net>
+ *
+ * @}
+ */
+
+#include <stdint.h>
+#include <TalkingLED.h>
+
+#include "arduino_board.h"
+
+TalkingLED tled;
+
+int main(void)
+{
+    tled.begin(ARDUINO_LED);
+
+    while (1) {
+        /* message 2: short short */
+        tled.message(2);
+        tled.waitEnd();
+        /* message 8: long long */
+        tled.message(8);
+        tled.waitEnd();
+    }
+
+    return 0;
+}