tests: add driver_my9221 test application

tests/driver_my9221/Makefile

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+APPLICATION = driver_my9221
+include ../Makefile.tests_common
+
+USEMODULE += my9221
+
+# 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_MY9221_CLK ?= GPIO_PIN\(0,1\)
+TEST_MY9221_DAT ?= GPIO_PIN\(0,2\)
+TEST_MY9221_DIR ?= MY9221_DIR_FWD
+TEST_MY9221_NUM ?= 10
+
+# export parameters
+CFLAGS += -DTEST_MY9221_CLK=$(TEST_MY9221_CLK)
+CFLAGS += -DTEST_MY9221_DAT=$(TEST_MY9221_DAT)
+CFLAGS += -DTEST_MY9221_DIR=$(TEST_MY9221_DIR)
+CFLAGS += -DTEST_MY9221_NUM=$(TEST_MY9221_NUM)
+
+test:
+	tests/01-run.py
+
+include $(RIOTBASE)/Makefile.include

tests/driver_my9221/README.md

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+# About
+
+This is a test application for the MY9221 LED controller driver, which is found
+on the Seeed Studio Grove LED bar module [1].
+
+# Details
+
+For this test application you can use e.g. the Groove LED bar which has 10 LEDs.
+The default settings in the Makefile are suited for the Grove ledbar, adapt them
+as needed for any other device or number of LEDs.
+
+The test application runs several test sequence, first toggling all LEDs
+one by one, and secondly setting all LEDs to 33%, 66%, and 100% brightness.
+Finally all LEDs are turned of again.
+
+[1]: https://www.seeedstudio.com/Grove-LED-Bar-v2.0-p-2474.html

tests/driver_my9221/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 MY9221 LED controller
+ *
+ * @author      Sebastian Meiling <s@mlng.net>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+
+#include "log.h"
+#include "xtimer.h"
+#include "my9221.h"
+
+#define TEST_STEP       (5U)
+#define TEST_WAIT       (42*US_PER_MS)
+
+static my9221_params_t params = {
+    .leds       = TEST_MY9221_NUM,
+    .dir        = TEST_MY9221_DIR,
+    .clk        = TEST_MY9221_CLK,
+    .dat        = TEST_MY9221_DAT,
+};
+
+int main(void)
+{
+    my9221_t dev;
+    /* init display */
+    puts("[START]");
+    if (my9221_init(&dev, &params) != 0) {
+        puts("[FAILED]");
+        return 1;
+    }
+    /* run some tests */
+    LOG_INFO("- light up all LEDs one by one.\n");
+    for (unsigned i=0; i < dev.params.leds; ++i) {
+        my9221_set_led(&dev, i, MY9221_LED_ON);
+        xtimer_usleep(TEST_WAIT);
+        my9221_set_led(&dev, i, MY9221_LED_OFF);
+    }
+    xtimer_usleep(TEST_WAIT);
+    for (unsigned i=dev.params.leds; i > 0 ; --i) {
+        my9221_set_led(&dev, i, MY9221_LED_ON);
+        xtimer_usleep(TEST_WAIT);
+        my9221_set_led(&dev, i, MY9221_LED_OFF);
+    }
+    xtimer_usleep(TEST_WAIT);
+    LOG_INFO("- light up all LEDs to 33%%.\n");
+    for (unsigned i=0; i < dev.params.leds; ++i) {
+        my9221_set_led(&dev, i, MY9221_LED_ON/3);
+        xtimer_usleep(TEST_WAIT);
+    }
+    xtimer_usleep(TEST_WAIT);
+    LOG_INFO("- light up all LEDs to 66%%.\n");
+    for (unsigned i=0; i < dev.params.leds; ++i) {
+        my9221_set_led(&dev, i, (MY9221_LED_ON/3)*2);
+        xtimer_usleep(TEST_WAIT);
+    }
+    xtimer_usleep(TEST_WAIT);
+    LOG_INFO("- light up all LEDs to 100%%.\n");
+    for (unsigned i=0; i < dev.params.leds; ++i) {
+        my9221_set_led(&dev, i, MY9221_LED_ON);
+        xtimer_usleep(TEST_WAIT);
+    }
+    xtimer_usleep(TEST_WAIT);
+    LOG_INFO("- turn off all LEDs\n");
+    for (unsigned i=dev.params.leds; i > 0 ; --i) {
+        my9221_toggle_led(&dev, i-1);
+        xtimer_usleep(TEST_WAIT);
+    }
+    puts("[SUCCESS]");
+
+    return 0;
+}

tests/driver_my9221/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("[SUCCESS]", timeout=60)
+
+if __name__ == "__main__":
+    sys.exit(testrunner.run(testfunc))