sample: board: add SensorTile.box Pro sample for testing sensors

Add sample to test SensorTile.box Pro sensors on board.

Signed-off-by: Armando Visconti <armando.visconti@st.com>

samples/boards/sensortile_box_pro/sensors-on-board/CMakeLists.txt

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+# Copyright (c) 2023 STMicroelectronics
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(sensortile_box_pro)
+
+target_sources(app PRIVATE src/main.c)

samples/boards/sensortile_box_pro/sensors-on-board/README.rst

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+.. _sensortile_box_pro_sample_sensors:
+
+ST SensorTile.box Pro on-board sensors test
+###########################################
+
+Overview
+********
+This sample provides an example of how to read sensors data
+from the SensorTile.box Pro board.
+
+This sample enables all sensors of SensorTile.box Pro board, and then
+periodically reads and displays data on the console from the following
+sensors:
+
+- HTS221: ambient temperature and relative humidity
+- LSM6DSV16X: 6-Axis acceleration and angular velocity
+
+Requirements
+************
+
+The application requires a SensorTile.box Pro board connected to the PC
+through USB. The board shows up as a USB CDC class standard device.
+
+References
+**********
+
+- :ref:`sensortile_box_pro_board`
+
+Building and Running
+********************
+
+Build and flash the sample in the following way:
+
+.. zephyr-app-commands::
+    :zephyr-app: samples/boards/sensortile_box_pro/sensors-on-board
+    :board: sensortile_box_pro
+    :goals: build flash
+
+Please note that flashing the board requires a few preliminary steps described
+in :ref:`sensortile_box_pro_board`.
+
+Then, power cycle the board by disconnecting and reconnecting the USB cable.
+Run your favorite terminal program to listen for output.
+
+.. code-block:: console
+
+   $ minicom -D <tty_device> -b 115200
+
+Replace :code:`<tty_device>` with the correct device path automatically created on
+the host after the SensorTile.box Pro board gets connected to it,
+usually :code:`/dev/ttyUSBx` or :code:`/dev/ttyACMx` (with x being 0, 1, 2, ...).
+The ``-b`` option sets baud rate ignoring the value from config.
+
+Sample Output
+=============
+
+The sample code outputs sensors data on the SensorTile.box Pro console.
+
+ .. code-block:: console
+
+    SensorTile.box Pro dashboard
+
+    HTS221: Temperature: 26.4 C
+    HTS221: Relative Humidity: 60.5%
+    LSM6DSV16X: Accel (m.s-2): x: -0.158, y: 0.158, z: 9.811
+    LSM6DSV16X: GYro (dps): x: 0.003, y: 0.000, z: -0.005
+    1:: lsm6dsv16x acc trig 836
+    1:: lsm6dsv16x gyr trig 836
+
+    <repeats endlessly every 2s>

samples/boards/sensortile_box_pro/sensors-on-board/prj.conf

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+CONFIG_LOG=y
+CONFIG_PRINTK=y
+CONFIG_SPI=y
+CONFIG_I2C=y
+CONFIG_GPIO=y
+
+# config sensors
+CONFIG_SENSOR=y
+CONFIG_SENSOR_LOG_LEVEL_DBG=y
+CONFIG_HTS221_TRIGGER_NONE=y
+CONFIG_LSM6DSV16X_TRIGGER_OWN_THREAD=y
+CONFIG_LIS2MDL_TRIGGER_OWN_THREAD=y
+
+CONFIG_CBPRINTF_FP_SUPPORT=y

samples/boards/sensortile_box_pro/sensors-on-board/sample.yaml

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+sample:
+  description: SensorTile.box Pro board testing
+  name: SensorTile.box Pro test
+tests:
+  sample.board.sensortile_box_pro.sensors-on-board:
+    harness: sensor
+    platform_allow: sensortile_box_pro
+    tags: sensors
+    depends_on:
+      - i2c
+      - spi
+      - gpio