55ee53ce91
Prepend the text 'cmake_minimum_required(VERSION 3.8.2)' into the application and test build scripts. Modern versions of CMake will spam users with a deprecation warning when the toplevel CMakeLists.txt does not specify a CMake version. This is documented in bug #8355. To resolve this we include a cmake_minimum_required() line into the toplevel build scripts. Additionally, cmake_minimum_required is invoked from within boilerplate.cmake. The highest version will be enforced. This patch allows us to afterwards change CMake policy CMP000 from OLD to NEW which in turn finally rids us of the verbose warning. The extra boilerplate is considered more acceptable than the verbosity of the CMP0000 policy. Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no> |
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| CMakeLists.txt | ||
| README.rst | ||
| prj.conf | ||
| sample.yaml | ||
README.rst
.. _microbit_sound: BBC micro:bit sound ################### Overview ******** This is simple example demonstrating how to use a piezo buzzer connected to port P0 on the edge connector of the BBC micro:bit board. Note that the buzzer is not part of the main micro:bit board, rather it it needs to be separately acquired and connected. A well working 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 ******** The sample can be built as follows: .. zephyr-app-commands:: :zephyr-app: samples/boards/microbit/sound :board: bbc_microbit :goals: build :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.