samples: boards: nordic: add nrf_sys_event sample

Add sample for nrf system events.

Signed-off-by: Bjarki Arge Andreasen <bjarki.andreasen@nordicsemi.no>

samples/boards/nordic/nrf_sys_event/CMakeLists.txt

@@ -0,0 +1,9 @@
+# Copyright 2024 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(soc_sys_event)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

samples/boards/nordic/nrf_sys_event/prj.conf

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+# Copyright 2024 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_NRF_SYS_EVENT=y

samples/boards/nordic/nrf_sys_event/sample.yaml

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+sample:
+  name: nRF System events
+tests:
+  sample.boards.nordic.nrf_sys_event:
+    harness: console
+    harness_config:
+      type: one_line
+      regex:
+        - "constant latency mode disabled"
+    platform_allow:
+      - nrf52dk/nrf52810
+      - nrf52dk/nrf52832
+      - nrf52833dk/nrf52820
+      - nrf52833dk/nrf52833
+      - nrf52840dk/nrf52811
+      - nrf52840dk/nrf52840
+      - nrf5340dk/nrf5340/cpuapp
+      - nrf5340dk/nrf5340/cpunet
+      - nrf54h20dk/nrf54h20/cpuapp
+      - nrf54h20dk/nrf54h20/cpurad
+      - nrf54l15dk/nrf54l15/cpuapp
+    integration_platforms:
+      - nrf52840dk/nrf52840
+      - nrf5340dk/nrf5340/cpuapp
+      - nrf5340dk/nrf5340/cpunet
+      - nrf54h20dk/nrf54h20/cpuapp
+      - nrf54h20dk/nrf54h20/cpurad
+      - nrf54l15dk/nrf54l15/cpuapp

samples/boards/nordic/nrf_sys_event/src/main.c

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+/*
+ * Copyright (c) 2024 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <nrf_sys_event.h>
+#include <stdio.h>
+
+int main(void)
+{
+	printf("request global constant latency mode\n");
+	if (nrf_sys_event_request_global_constlat()) {
+		printf("failed to request global constant latency mode\n");
+		return 0;
+	}
+	printf("constant latency mode enabled\n");
+
+	printf("request global constant latency mode again\n");
+	if (nrf_sys_event_request_global_constlat()) {
+		printf("failed to request global constant latency mode\n");
+		return 0;
+	}
+
+	printf("release global constant latency mode\n");
+	printf("constant latency mode will remain enabled\n");
+	if (nrf_sys_event_release_global_constlat()) {
+		printf("failed to release global constant latency mode\n");
+		return 0;
+	}
+
+	printf("release global constant latency mode again\n");
+	printf("constant latency mode will be disabled\n");
+	if (nrf_sys_event_release_global_constlat()) {
+		printf("failed to release global constant latency mode\n");
+		return 0;
+	}
+
+	printf("constant latency mode disabled\n");
+	return 0;
+}