zephyr

History

Gerard Marull-Paretas ae91933c4a drivers: pwm: always use nanoseconds for set In order to be consistent with what is possible in Devicetree, always take a period in nanoseconds. Other scales or units may be specified by using, e.g., the PWM_MSEC() macros (all of them converting down to nanoseconds). This change then deletes the "_nsec" and "_usec" versions of the pwm_set call. Note that this change limits the period to UINT32_MAX nanoseconds, ~4.3s. PWM is, in generali, used with periods below the second so it should not be a problem. Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>		2022-04-28 11:29:38 +02:00
..
boards	…
src	drivers: pwm: always use nanoseconds for set	2022-04-28 11:29:38 +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.