| .. _nrf-system-off-sample: |
| |
| nRF5x System Off demo |
| ##################### |
| |
| Overview |
| ******** |
| |
| This sample can be used for basic power measurement and as an example of |
| deep sleep on Nordic platforms. The functional behavior is: |
| |
| * Busy-wait for 2 seconds |
| * Sleep for 2 seconds without device power control |
| * Sleep for 2 seconds after turning UART off, which reduces current draw |
| by a couple hundred uA |
| * Turn the system off after enabling wakeup through a button press |
| |
| A power monitor will be able to distinguish among these states. |
| |
| Requirements |
| ************ |
| |
| This application uses nRF51 DK or nRF52 DK board for the demo. |
| |
| Building, Flashing and Running |
| ****************************** |
| |
| .. zephyr-app-commands:: |
| :zephyr-app: samples/boards/nrf52/system_off |
| :board: nrf52dk_nrf52832 |
| :goals: build flash |
| :compact: |
| |
| Running: |
| |
| 1. Open UART terminal. |
| 2. Power Cycle Device. |
| 3. Device will demonstrate two activity levels which can be measured. |
| 4. Device will demonstrate long sleep at minimal non-off power. |
| 5. Device will turn itself off using deep sleep state 1. Press Button 1 |
| to wake the device and restart the application as if it had been |
| powered back on. |
| |
| Sample Output |
| ================= |
| nRF52 core output |
| ----------------- |
| |
| .. code-block:: console |
| |
| *** Booting Zephyr OS build v2.3.0-rc1-204-g5f2eb85f728d *** |
| |
| nrf52dk_nrf52832 system off demo |
| Busy-wait 2 s |
| Busy-wait 2 s with UART off |
| Sleep 2 s |
| Sleep 2 s with UART off |
| Entering system off; press BUTTON1 to restart |
