zephyr

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Tomasz Bursztyka e18fcbba5a device: Const-ify all device driver instance pointers Now that device_api attribute is unmodified at runtime, as well as all the other attributes, it is possible to switch all device driver instance to be constant. A coccinelle rule is used for this: @r_const_dev_1 disable optional_qualifier @ @@ -struct device * +const struct device * @r_const_dev_2 disable optional_qualifier @ @@ -struct device * const +const struct device * Fixes #27399 Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>		2020-09-02 13:48:13 +02:00
..
src	device: Const-ify all device driver instance pointers	2020-09-02 13:48:13 +02:00
CMakeLists.txt	…
README.rst	…
prj.conf	…
sample.yaml	…

README.rst

.. _microbit_sound:

BBC micro:bit sound
###################

Overview
********

This sample demonstrates how to use a piezo buzzer connected
to port P0 on the edge connector of the BBC micro:bit board.

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

A separate piezo buzzer connected to the board. One example is the MI:Power
board that has a piezo buzzer in addition to a coin-cell battery. Resellers of
this board can be fairly easily found using online search.

Building and running
********************

The sample can be built as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/boards/bbc_microbit/sound
   :board: bbc_microbit
   :goals: build flash
   :compact:

Sample Output
=============

This sample outputs sounds through a connected piezo buzzer based on
button presses of the two main buttons. For each press the current
output frequency will be printed on the 5x5 LED display.