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nvs_flash_init may return an error code in some cases, and applications should check this error code (or at least assert on it being ESP_OK, to make potential issues more immediately obvious). This change modifies all the examples which use NVS to check the error code. Most examples get a simple ESP_ERROR_CHECK assert, while NVS examples, OTA example, and NVS unit tests get a more verbose check which may be used in real applications. |
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| README.md | ||
Non-Volatile Storage (NVS) Read and Write Example
Demonstrates how to read and write a single integer value and a blob (binary large object) using NVS to preserve them between ESP32 module restarts.
- value - tracks number of ESP32 module soft and hard restarts.
- blob - contains a table with module run times. The table is read from NVS to dynamically allocated RAM. New run time is added to the table on each manually triggered soft restart and written back to NVS. Triggering is done by pulling down GPIO0.
Example also shows how to implement diagnostics if read / write operation was successful.
If not done already, consider checking simpler example storage/nvs_rw_value, that has been used as a starting point for preparing this one.
Detailed functional description of NVS and API is provided in documentation.
See the README.md file in the upper level 'examples' directory for more information about examples.