zephyr

History

Felipe Neves b50cb2a537 drivers: counter: esp32: add support for esp32c3 to the unified esp32 counter driver. Signed-off-by: Felipe Neves <felipe.neves@espressif.com>		2021-11-11 19:14:15 -05:00
..
boards	drivers: counter: esp32: add support for esp32c3	2021-11-11 19:14:15 -05:00
src	drivers: counter: added ctimer driver for lpcexpresso55s69	2021-08-24 17:13:22 -04:00
CMakeLists.txt	cmake: increase minimal required version to 3.20.0	2021-08-20 09:47:34 +02:00
Kconfig	esp32s2: samples: counter: add alarm sample support	2021-09-06 10:02:57 -04:00
prj.conf
README.rst
sample.yaml	boards: add mcp7940n to bl5340_dvk	2021-07-30 19:51:29 -04:00

README.rst

.. _alarm_sample:

Counter Alarm Sample
#####################

Overview
********
This sample provides an example of alarm application using counter API.
It sets an alarm with an initial delay of 2 seconds. At each alarm
expiry, a new alarm is configured with a delay multiplied by 2.

.. note::
   In case of 1Hz frequency (RTC for example), precision is 1 second.
   Therefore, the sample output may differ in 1 second

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

This sample requires the support of a timer IP compatible with alarm setting.

References
**********

- :ref:`disco_l475_iot1_board`

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

 .. zephyr-app-commands::
    :zephyr-app: samples/drivers/counter/alarm
    :host-os: unix
    :board: disco_l475_iot1
    :goals: run
    :compact:

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

 .. code-block:: console

    Counter alarm sample

    Set alarm in 2 sec
    !!! Alarm !!!
    Now: 2
    Set alarm in 4 sec
    !!! Alarm !!!
    Now: 6
    Set alarm in 8 sec
    !!! Alarm !!!
    Now: 14
    Set alarm in 16 sec
    !!! Alarm !!!
    Now: 30

    <repeats endlessly>