| .. _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> |
