arduino-esp32/libraries/EEPROM/examples/eeprom_class/eeprom_class.ino

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/*
ESP32 eeprom_class example with EEPROM library
This simple example demonstrates using EEPROM library to store different data in
ESP32 Flash memory in a multiple user-defined EEPROM partition (0x1000 or 4KB max size or less).
Install 'ESP32 Partiton Manager' ONCE from https://github.com/francis94c/ESP32Partitions
And generate different partitions with 'partition_name'
Usage: EEPROMClass ANY_OBJECT_NAME("partition_name", size);
Generated partition that would work perfectly with this example
#Name, Type, SubType, Offset, Size, Flags
nvs, data, nvs, 0x9000, 0x5000,
otadata, data, ota, 0xe000, 0x2000,
app0, app, ota_0, 0x10000, 0x140000,
app1, app, ota_1, 0x150000, 0x140000,
eeprom0, data, 0x99, 0x290000, 0x1000,
eeprom1, data, 0x9a, 0x291000, 0x500,
eeprom2, data, 0x9b, 0x292000, 0x100,
spiffs, data, spiffs, 0x293000, 0x16d000,
Created for arduino-esp32 on 25 Dec, 2017
by Elochukwu Ifediora (fedy0)
*/
#include "EEPROM.h"
// Instantiate eeprom objects with parameter/argument names and size same as in the partition table
EEPROMClass NAMES("eeprom0", 0x500);
EEPROMClass HEIGHT("eeprom1", 0x200);
EEPROMClass AGE("eeprom2", 0x100);
void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
Serial.println("Testing EEPROMClass\n");
if (!NAMES.begin(NAMES.length())) {
Serial.println("Failed to initialise NAMES");
Serial.println("Restarting...");
delay(1000);
ESP.restart();
}
if (!HEIGHT.begin(HEIGHT.length())) {
Serial.println("Failed to initialise HEIGHT");
Serial.println("Restarting...");
delay(1000);
ESP.restart();
}
if (!AGE.begin(AGE.length())) {
Serial.println("Failed to initialise AGE");
Serial.println("Restarting...");
delay(1000);
ESP.restart();
}
char* name = "Teo Swee Ann";
double height = 5.8;
uint32_t age = 47;
// Write: Variables ---> EEPROM partitions
NAMES.put(0, name);
HEIGHT.put(0, height);
AGE.put(0, age);
Serial.print("name: "); Serial.println(name);
Serial.print("height: "); Serial.println(height);
Serial.print("age: "); Serial.println(age);
Serial.println("------------------------------------\n");
// Clear variables
name = '\0';
height = 0;
age = 0;
Serial.print("name: "); Serial.println(name);
Serial.print("height: "); Serial.println(height);
Serial.print("age: "); Serial.println(age);
Serial.println("------------------------------------\n");
// Read: Variables <--- EEPROM partitions
NAMES.get(0, name);
HEIGHT.get(0, height);
AGE.get(0, age);
Serial.print("name: "); Serial.println(name);
Serial.print("height: "); Serial.println(height);
Serial.print("age: "); Serial.println(age);
Serial.println("Done!");
}
void loop() {
// put your main code here, to run repeatedly:
}