ESP WROOM 32 SPI Flash Memory

ViW · January 22, 2019, 12:09pm

Hi everyone,

I use Adafruit ESP32 Feather Huzzah32, I want to use flash memory (4MB) but I can not find an example to store values in this memory.

Can someone help me ?

Vincent

DrDooom · January 24, 2019, 8:35am

Use EEPROM library.

Tut: ESP32 Flash Memory - Save Permanent Data | Random Nerd Tutorials

gbafamily · January 24, 2019, 8:50am

If you want to read/write lots data use SPIFFS (SPI Flash File System). One option is to configure 1MB for code and 3MB for SPIFFS.

github.com

espressif/arduino-esp32/blob/master/libraries/SPIFFS/examples/SPIFFS_Test/SPIFFS_Test.ino

#include "FS.h"
#include "SPIFFS.h"

/* You only need to format SPIFFS the first time you run a
   test or else use the SPIFFS plugin to create a partition
   https://github.com/me-no-dev/arduino-esp32fs-plugin */
#define FORMAT_SPIFFS_IF_FAILED true

void listDir(fs::FS &fs, const char * dirname, uint8_t levels){
    Serial.printf("Listing directory: %s\r\n", dirname);

    File root = fs.open(dirname);
    if(!root){
        Serial.println("- failed to open directory");
        return;
    }
    if(!root.isDirectory()){
        Serial.println(" - not a directory");
        return;
    }

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ViW · January 26, 2019, 3:34pm

Thanks for your answer DrDooom and gbafamily.

DrDooom, I try this solution but I can not save much data just 4kbytes.

Gbafamily, this solution works when the card is linked to the PC but in the case of an embedded system it is not functional.

Finally, I find solution to write in flash memory. I use ESP.flashWrite and ESP.flashRead.

Vincent

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ESP WROOM 32 SPI Flash Memory

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