samples: nrf_profiler: Demonstrate calculating statistics

Change adds a new testing step demonstrating calculating statistics.
Change also adds related test preset for the nRF Profiler host tools.

Jira: NCSDK-35261

Signed-off-by: Marek Pieta <[email protected]>
Signed-off-by: Uma Praseeda <[email protected]>
Signed-off-by: Pekka Niskanen <[email protected]>

Author: MarekPieta

doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst

@@ -472,7 +472,10 @@ Wi-Fi samples
 Other samples
 -------------
 
-|no_changes_yet_note|
+* :ref:`nrf_profiler_sample` sample:
+
+  * Added a new testing step demonstrating how to calculate event propagation statistics.
+    Also added the related test preset for the :file:`calc_stats.py` script (:file:`nrf/scripts/nrf_profiler/stats_nordic_presets/nrf_profiler.json`).
 
 Drivers
 =======

samples/nrf_profiler/README.rst

@@ -49,10 +49,9 @@ After programming the sample to your development kit, you can test it by perform
 #. Run the script :file:`real_time_plot.py`, with the name that should be used to store the data as the argument.
    For example:
 
-   .. parsed-literal::
-      :class: highlight
+   .. code-block:: console
 
-      real_time_plot.py *test_name*
+      python3 real_time_plot.py *test_name*
 
    This command generates a :file:`test_name.csv` file and a :file:`test_name.json` file.
    The script opens a GUI window that displays events as dots on timelines, similar to the following diagram.
@@ -64,8 +63,15 @@ After programming the sample to your development kit, you can test it by perform
    See the :ref:`nrf_profiler_backends_custom_visualization` section in the nRF Profiler documentation for more information about the GUI.
 
 #. |connect_terminal|
+   After you connect, the sample will display messages in the terminal.
+#. Calculate the nRF Profiler event propagation statistics (statistics for time intervals between nRF Profiler events) from the previously collected dataset using the following command:
 
-After you connect, the sample will display messages in the terminal.
+   .. code-block:: console
+
+      python3 calc_stats.py *test_name* stats_nordic_presets/nrf_profiler.json
+
+   The :file:`stats_nordic_presets/nrf_profiler.json` file specifies the nRF Profiler events used for the calculations.
+   The file refers to the events used by the sample.
 
 Dependencies
 ************

scripts/nrf_profiler/stats_nordic_presets/nrf_profiler.json

@@ -0,0 +1,20 @@
+[
+	{
+		"name": "Time between no data events",
+		"start_event": {
+			"name": "no data event"
+		},
+		"end_event": {
+			"name": "no data event"
+		}
+	},
+	{
+		"name": "Time from no data event to data event",
+		"start_event": {
+			"name": "no data event"
+		},
+		"end_event": {
+			"name": "data event"
+		}
+	}
+]