Persist Data on Opta

Official Hardware Opta
1

Good morning everyone,
I am writing because I cannot persist data on Opta Finder Pro. From the documentation I found online I understood that it is possible to save variables persistently on the device. It would be convenient for me to save the wifi credentials (so a text representing the password would be sufficient).
It should be possible through the LittleFSManager.h library.

I tried this program:

#include "LittleFSManager.h"

void setup() {
    Serial.begin(115200);
    if (!initLittleFS()) return;

    String miavar = readVariable("miavar");
    if (miavar == "") {
        while (Serial.available() == 0);
        miavar = Serial.readStringUntil('\n');
        miavar.trim();
        saveVariable("miavar", miavar);
        NVIC_SystemReset();
    }
}

void loop() {
    if (readVariable("miavar") != "") {
        Serial.println("password impostata");
        delay(5000);
    }
}

The compilation does not give errors, but once started the device goes into protection (red LED blinking).
This microcontroller came to me by chance, I would like to play with it a bit, do you know if it is possible to persist data on the device?

The Arduino Opta Finder Pro uses the STM32H747XI microcontroller from STMicroelectronics.

Obviously I wouldn't want to use an external SD.

2

Hello maurogallo,

You can use flash memory, just read this tutorial.

I hope that is what you are looking for.

3

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