Store non-volatile data in flash?

Hacking
1

Is there a way to keep values of global variables after power off with Nextion Basic? (Basic models don’t contain EEPROM.) Since the flash memory is non-volatile i assume it’s possible. I know there’s the addr command which stores address and the address is non-volatile.

My company have a stock of Nextion Basics, so buying new ones with EEPROM isn’t really an option.

2

The Nextion firmware is obviously able to store a few bytes of non-volatile system parameters like dims, bauds, etc. probably in the internal MCU’s flash memory. But that’s (technically) a completely different thing from the EEPROM of the enhanced series, where an external 24C08 memory IC is soldered on the PCB for this purpose.

I have no clue about your project, but I guess that it’s not forcibly a Nextion as a stand-alone solution and you have it connected to an external uP (which in many cases has some non-volatile memory) and which could preload global variables of the Nextion.

3

Hi and welcome @david!

I agree with @Fjodor that the best solution would be to use the microcontroller to store the data and load it from there. Many micros do have EEPROM built-in and even if not, they easily allow you to use an EEPROM chip.

Speaking of those few non-volatile system variables, I do wonder for how many write cycles they’re specified… Anyone got any info on that?

Kind regards,
Max

4

Thanks for the reply. You’re right, I’ll have to use the MCU then.

5

Thank you for your reply.
As for the write cycles, I identified the flash on the back of the device, I searched the data sheet, it says 100K write cycles. Documentation - Winbond

Kind regards,
David

6

Do you know how to make it work addr variable. I can’t find how

Thanks