Persistance Variable in Firmware

WisBlock
1

Hi,

I’m creating a firmware which will be used by many users that need to save at least 3 variable/data as persistence in the RAK4630

  1. string (length <= 11)
  2. float (latitude with 7 decimals)
  3. float (longitude with 7 decimals)

is there a tutorial/guide to achieve this when programing using platformio? To save/write data and then read it at next boot?

2

Hello Ricardo,

Are you using RUI3 or the Arduino BSP version?
The methods to store values in the flash are different for the two.

3

Im only using VSCODE with Platformio , never heard of RUI3 and Arduino BSP.

are this libraries or some way to make programming easier?

4

If you are using PlatformIO, then you are using the Arduino BSP, it is just called nRF52 Platform there.

I do not have a simple example how to store variables in the flash (in this case using the file system of the nRF52 platform), but you can have a look into flash-nrf52.cpp
There are functions to

  • initialize the file system and read a data structure from it
  • check if the structure is valid
  • write a default structure if the data is invalid
  • have a function to save a data structure to the file system

As this is saved in flash, it is persistence over resets and power cycles.

5

Great!! after some code “fighting” I got it running… should I share here some basic guidelines for future users?

6

Sure, you’re welcome to post some tutorial here.