espp/nvs - 0.21.0 - Example example • ESP Component Registry

# NVS Example This example shows the use of the `NVS` component to save a variable to the NVS and load it after reset. ## How to use example The example outputs a log that counts up the number of times the system has been reset since the NVS was last cleared. ### Build and Flash Build the project and flash it to the board, then run monitor tool to view serial output: ``` idf.py -p PORT flash monitor ``` (Replace PORT with the name of the serial port to use.) (To exit the serial monitor, type ``Ctrl-]``.) See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects. ## NVS Example Output ![CleanShot 2024-05-18 at 12 54 46](https://github.com/esp-cpp/espp/assets/213467/60b2db2f-8796-4ae3-9a8c-51f69fa21911) ![CleanShot 2024-05-18 at 12 54 54](https://github.com/esp-cpp/espp/assets/213467/ddceddbf-0690-4590-93b6-66cf91ad1898) ![CleanShot 2024-05-18 at 12 55 02](https://github.com/esp-cpp/espp/assets/213467/1181fc79-f7bd-4b1d-b351-e5ca24ee7c55) ## NVSHandle Example Output First run: ``` Opening Non-Volatile Storage (NVS) handle... Done Reading restart counter from NVS ... [NVSHandle/E][0.061]: The value is not initialized in NVS, key = 'restart_counter' The value is not initialized yet! Updating restart counter in NVS ... Done Committing updates in NVS ... Done Restarting in 10 seconds... Restarting in 9 seconds... Restarting in 8 seconds... Restarting in 7 seconds... Restarting in 6 seconds... Restarting in 5 seconds... Restarting in 4 seconds... Restarting in 3 seconds... Restarting in 2 seconds... Restarting in 1 seconds... Restarting in 0 seconds... Restarting now. ``` Subsequent runs: ``` Opening Non-Volatile Storage (NVS) handle... Done Reading restart counter from NVS ... Done Restart counter = 1 Updating restart counter in NVS ... Done Committing updates in NVS ... Done Restarting in 10 seconds... Restarting in 9 seconds... Restarting in 8 seconds... Restarting in 7 seconds... Restarting in 6 seconds... Restarting in 5 seconds... Restarting in 4 seconds... Restarting in 3 seconds... Restarting in 2 seconds... Restarting in 1 seconds... Restarting in 0 seconds... Restarting now. ``` Restart counter will increment on each run. To reset the counter, erase the contents of flash memory using `idf.py erase-flash`, then upload the program again as described above.