tests: add driver_grove_ledbar test application

tests/driver_grove_ledbar/Makefile

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+APPLICATION = driver_grove_ledbar
+include ../Makefile.tests_common
+
+USEMODULE += grove_ledbar
+
+# set default device parameters in case they are undefined
+# the following params are for board pba-d-01-kw2x and pins PA01 and PA02
+TEST_GROVE_LEDBAR_CLK ?= 	GPIO_PIN\(0,1\)
+TEST_GROVE_LEDBAR_DAT ?= 	GPIO_PIN\(0,2\)
+TEST_GROVE_LEDBAR_DIR ?=	GROVE_LEDBAR_G2R
+
+# export parameters
+CFLAGS += -DGROVE_LEDBAR_CLK=$(TEST_GROVE_LEDBAR_CLK)
+CFLAGS += -DGROVE_LEDBAR_DAT=$(TEST_GROVE_LEDBAR_DAT)
+CFLAGS += -DGROVE_LEDBAR_DIR=$(TEST_GROVE_LEDBAR_DIR)
+
+test:
+	tests/01-run.py
+
+include $(RIOTBASE)/Makefile.include

tests/driver_grove_ledbar/README.md

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+# About
+
+This is a test application for the Seeed Studio Grove LED bar module [1].
+
+# Details
+
+This test application will initialize a Groove LED bar with the configuration
+as specified in the `grove_ledbar_params.h` file. To connect the LED bar with
+your board use the following pinout:
+
+- Pin GND is connected directly to GND.
+- Pin VCC is connected directly to VCC +3.3V, or 5V if your board allows that.
+- Pin DCKI is the clock pin and is connected to a free GPIO
+- Pin DI is the data pin and is connected to a free GPIO, too
+
+for the 2 latter pins note the port and pin number and adapt the Makefile
+accordingly.
+
+The test application will light up the LED bar several times, running from 0%
+up to 100% and down to 0% again.
+
+[1]: https://www.seeedstudio.com/Grove-LED-Bar-v2.0-p-2474.html

tests/driver_grove_ledbar/main.c

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+/*
+ * Copyright (C) 2017 HAW Hamburg
+ *
+ * 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       Test application for the Grove ledbar
+ *
+ * @author      Sebastian Meiling <s@mlng.net>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+
+#include "log.h"
+#include "xtimer.h"
+#include "grove_ledbar.h"
+#include "grove_ledbar_params.h"
+
+#define TEST_RUNS       (5U)
+#define TEST_STEP       (5U)
+#define TEST_WAIT       (42*US_PER_MS)
+
+int main(void)
+{
+    grove_ledbar_t dev;
+    /* init display */
+    puts("[START]");
+    if (grove_ledbar_init(&dev, &grove_ledbar_params[0]) != 0) {
+        puts("[FAILED]");
+        return 1;
+    }
+    LOG_INFO(" stepwise increase LED bar to 100%% and then decrease to 0%%.\n\n");
+    for (unsigned r = 0; r < TEST_RUNS; ++r) {
+        LOG_INFO(" >>> round %u\n", (r+1));
+        uint8_t lvl = 0;
+        while (lvl < GROVE_LEDBAR_MAX - TEST_STEP) {
+            grove_ledbar_set(&dev, lvl);
+            lvl += TEST_STEP;
+            xtimer_usleep(TEST_WAIT);
+        }
+        grove_ledbar_set(&dev, GROVE_LEDBAR_MAX);
+        /* turn all off */
+        xtimer_usleep(TEST_WAIT);
+        lvl = GROVE_LEDBAR_MAX;
+        while (lvl > TEST_STEP) {
+            grove_ledbar_set(&dev, lvl);
+            lvl -= TEST_STEP;
+            xtimer_usleep(TEST_WAIT);
+        }
+        /* turn all off */
+        grove_ledbar_clear(&dev);
+    }
+    puts("[SUCCESS]");
+
+    return 0;
+}

tests/driver_grove_ledbar/tests/01-run.py

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+#!/usr/bin/env python3
+
+# Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
+#               2017 Sebastian Meiling <s@mlng.net>
+#
+# 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.
+
+import os
+import sys
+
+sys.path.append(os.path.join(os.environ['RIOTBASE'], 'dist/tools/testrunner'))
+import testrunner
+
+def testfunc(child):
+    child.expect_exact(u"[SUCCESS]", timeout=60)
+
+if __name__ == "__main__":
+    sys.exit(testrunner.run(testfunc))