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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

Building and Running

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

Sample Output

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>