Detect if new software flashed

[0xffff]

Hi,

Is there a way to detect if new software has been flashed to the system? That is, upon restart, I would like to check if this is brand new software, and if so, take certain actions. I think I can save some kind of build number to nv ram, and then check on boot if the build number is the same as the last one, but I wonder if there is already a facility provided.

Thanks

[kolban]

Ive not heard of such a capability. However, if you generate a hash of the content of the executing partition and save it in NVS then the next time you start you can compute the hash again and see if it matches what was previously saved.

[fly135]

Just put a print statement in your code to print the version that you called it and look at it with a terminal program. To be quite frank, your explanation of your problem is woefully lacking. Hence wondering why you don't know if you did or didn't flash new software to the ESP32.

John A

[michprev]

In fact there probably is SHA256 checksum of ESP image in flash so you don't have to compute it. Take a look at https://github.com/espressif/esp-idf/bl ... e_format.c. Unfortunately there is no note about it here https://github.com/espressif/esptool/wi ... age-Format.

[ESP_Angus]

We're adding an API to return this SHA value as part of IDF v3.2. This will give you a canonical identifier for the app.

However if you actually want to do version updates (ie migrate some NVS schema, or set some values when a new version is loaded) then I suggest adding a version constant somewhere in your app and check it. You can save the last loaded version in NVS as an integer, and compare to the version compiled into the running app.

[0xffff]

Thanks, sounds like until 3.2 easiest thing is to save a build/version number to nvs and then check upon boot.