tests: drivers: counter: Add test suite for nrf rtc fixed top value feature

Added test suite which performs sanity check on instances with
fixed-top feature enabled.

Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>

tests/drivers/counter/counter_nrf_rtc/fixed_top/CMakeLists.txt

@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(NONE)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/drivers/counter/counter_nrf_rtc/fixed_top/boards/nrf52840_pca10056.conf

@@ -0,0 +1,2 @@
+CONFIG_COUNTER_RTC0=y
+CONFIG_COUNTER_RTC2=y

tests/drivers/counter/counter_nrf_rtc/fixed_top/nrf52840_pca10056.overlay

@@ -0,0 +1,6 @@
+&rtc0 {
+	fixed-top;
+};
+&rtc2 {
+	fixed-top;
+};

tests/drivers/counter/counter_nrf_rtc/fixed_top/prj.conf

@@ -0,0 +1,3 @@
+CONFIG_COUNTER=y
+CONFIG_BT=n
+CONFIG_ZTEST=y

tests/drivers/counter/counter_nrf_rtc/fixed_top/src/test_counter_fixed_top.c

@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2019, Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <drivers/counter.h>
+#include <ztest.h>
+#include <kernel.h>
+#include <logging/log.h>
+#include <hal/nrf_rtc.h>
+LOG_MODULE_REGISTER(test);
+
+static volatile u32_t top_cnt;
+
+const char *devices[] = {
+#ifdef CONFIG_COUNTER_RTC0
+	/* Nordic RTC0 may be reserved for Bluetooth */
+	DT_NORDIC_NRF_RTC_RTC_0_LABEL,
+#endif
+	/* Nordic RTC1 is used for the system clock */
+#ifdef CONFIG_COUNTER_RTC2
+	DT_NORDIC_NRF_RTC_RTC_2_LABEL,
+#endif
+
+};
+
+typedef void (*counter_test_func_t)(const char *dev_name);
+
+static void counter_setup_instance(const char *dev_name)
+{
+	top_cnt = 0U;
+}
+
+static void counter_tear_down_instance(const char *dev_name)
+{
+	int err;
+	struct device *dev;
+
+	dev = device_get_binding(dev_name);
+
+	err = counter_stop(dev);
+	zassert_equal(0, err, "%s: Counter failed to stop", dev_name);
+
+}
+
+static void test_all_instances(counter_test_func_t func)
+{
+	for (int i = 0; i < ARRAY_SIZE(devices); i++) {
+		counter_setup_instance(devices[i]);
+		func(devices[i]);
+		counter_tear_down_instance(devices[i]);
+		/* Allow logs to be printed. */
+		k_sleep(100);
+	}
+}
+
+void test_set_custom_top_value_fails_on_instance(const char *dev_name)
+{
+	struct device *dev;
+	int err;
+	struct counter_top_cfg top_cfg = {
+		.callback = NULL,
+		.flags = 0
+	};
+
+	dev = device_get_binding(dev_name);
+	top_cfg.ticks = counter_get_max_top_value(dev) - 1;
+
+	err = counter_set_top_value(dev, &top_cfg);
+	zassert_true(err != 0, "%s: Expected error code", dev_name);
+}
+
+void test_set_custom_top_value_fails(void)
+{
+	test_all_instances(test_set_custom_top_value_fails_on_instance);
+}
+
+static void top_handler(struct device *dev, void *user_data)
+{
+	top_cnt++;
+}
+
+void test_top_handler_on_instance(const char *dev_name)
+{
+	struct device *dev;
+	u32_t tmp_top_cnt;
+	int err;
+	struct counter_top_cfg top_cfg = {
+		.callback = top_handler,
+		.flags = 0
+	};
+
+	dev = device_get_binding(dev_name);
+	top_cfg.ticks = counter_get_max_top_value(dev);
+
+	err = counter_set_top_value(dev, &top_cfg);
+	zassert_equal(0, err, "%s: Unexpected error code (%d)", dev_name, err);
+
+#ifdef CONFIG_COUNTER_RTC0
+	nrf_rtc_task_trigger(NRF_RTC0, NRF_RTC_TASK_TRIGGER_OVERFLOW);
+#endif
+#ifdef CONFIG_COUNTER_RTC2
+	nrf_rtc_task_trigger(NRF_RTC2, NRF_RTC_TASK_TRIGGER_OVERFLOW);
+#endif
+
+	counter_start(dev);
+	k_busy_wait(10000);
+
+	tmp_top_cnt = top_cnt;
+	zassert_equal(tmp_top_cnt, 1, "%s: Expected top handler", dev_name);
+}
+
+void test_top_handler(void)
+{
+	test_all_instances(test_top_handler_on_instance);
+}
+
+void test_main(void)
+{
+	ztest_test_suite(test_counter,
+		ztest_unit_test(test_set_custom_top_value_fails),
+		ztest_unit_test(test_top_handler)
+			 );
+	ztest_run_test_suite(test_counter);
+}

tests/drivers/counter/counter_nrf_rtc/fixed_top/testcase.yaml

@@ -0,0 +1,5 @@
+tests:
+  peripheral.counter:
+    tags: drivers
+    depends_on: counter
+    platform_whitelist: nrf52840_pca0056