zephyr

History

Gerard Marull-Paretas e0125d04af devices: constify statically initialized device pointers It is frequent to find variable definitions like this: ```c static const struct device *dev = DEVICE_DT_GET(...) ``` That is, module level variables that are statically initialized with a device reference. Such value is, in most cases, never changed meaning the variable can also be declared as const (immutable). This patch constifies all such cases. Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>		2022-08-19 11:51:26 +02:00
..
src	devices: constify statically initialized device pointers	2022-08-19 11:51:26 +02:00
CMakeLists.txt	cmake: Update cmake_minimum_required to 3.20.0	2022-07-04 10:18:45 +02:00
README.rst	…
sample.yaml	…

README.rst

.. _x-nucleo-53l0a1-sample:

X-NUCLEO-53L0A1 ranging and gesture detection sensor expansion board
#####################################################################

Overview
********
This sample demonstrate the usage of the 4 digits x 7 segments display and the
three VL53L0X ranging sensors on the :ref:`x_nucleo_53l0a1_shield`.

When flashed on a board, 2 modes are available. To switch from one mode to the
other, press the button ``sw0``.

Distance (onboard sensor)
-------------------------

This is the default mode when starting up. In this mode, if the distance to
the center sensor (soldered on the shield) is lower than 1.25m, then the
4x7 segment display shows the distance in cm.

Proximity (onboard + satellites)
--------------------------------

In this mode, the 4x7 segment display shows 3 stacked horizontal bars if there
is something in proximity for each sensor. The left sensor is shown on the
leftmost digit, then the center sensor, then the right sensor.
The proximity threshold is configured in
:kconfig:option:`CONFIG_VL53L0X_PROXIMITY_THRESHOLD`

To switch from one mode to another, press the button ``sw0``

Requirements
************

This sample communicates over I2C with the X-NUCLEO-53L0A1 shield
stacked on a board with an Arduino connector. The board's I2C must be
configured for the I2C Arduino connector (both for pin muxing
and devicetree). The board must also have a button with the alias ``sw0``
in its device tree.

References
**********

* `X-NUCLEO-53L0A1 website`_

Building and Running
********************

This sample runs with X-NUCLEO-53L0A1 stacked on any board with a matching
Arduino connector. For this example, we use a :ref:`nucleo_f429zi_board` board.

.. zephyr-app-commands::
   :zephyr-app: samples/shields/x_nucleo_53l0a1
   :board: nucleo_f429zi
   :goals: build
   :compact:

.. _X-NUCLEO-53L0A1 website:
   https://www.st.com/en/evaluation-tools/x-nucleo-53l0a1.html