Saving and reusing variables?

[ManuXD32]

Hi, i've seen the new block in the beta (EEPROM) and I was wondering how can I save the data of the variables so I can use it after rebooting the M5.
Example: the score of a game, save it so the next time you turn off and on the device the score is still there

[vkichline]

Are you talking about NVS (Non Volatile Storage?)
M5ez uses it for its preferences. Here is a file that reads and writes them in C: https://github.com/vkichline/M5ezSettingsStorage/blob/master/m5ez_prefs_storage.cpp

Basically, just include preferences.h, call prefs.begin with false for read/write, then use the accessors from preferences.h and finish with prefs.end().

[ManuXD32]

@vkichline thank youuuu

[world101]

Hi @manuxd32,
For uiFlow, there is an example of saving data as a key/value pair in M5 Docs.

I also created a simple example like this...

[Gaviota]

How many write operations are maximal at the EPROM possible?

[world101]

@gaviota said in Saving and reusing variables?:

How many write operations are maximal at the EPROM possible?

I was wondering the same thing. This source and in more detail this source say the typical is 100,000 write/erase cycles.

I'm also wondering which address location uiFlow uses to store the key/value data to EEPROM. @m5stack or @lukasmaximus do you know?

[ManuXD32]

@world101 thank you a lot!!!