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nvs_abstractions.md

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NVS Abstractions

The system class in itself is a mid-level class in our project. The intent of the NVS class is to save all other objects from code duplication.

Abstraction

Top-Level

When in operation, this class becomes an extension of other classes. So, the top-level abstraction is held in the calling class. The top level classes call save / restore functions.

Mid-Level

  • Opens and closes nvs storage.
  • Responsible for erasing partitions and namespaces.
  • Makes sure that any value not previously written, is populated with the correct default value.
  • Disallows a value to be written twice if the stored value already matches a new value.

Here, we expose our interface with write / read functions.

Low-Level

The system will make calls directly back to the ESP-IDF. There are no other intermediary actors between NVS and the IDF.

You will notice that the IDF exposes NVS with set / get functions.