Prvni ulozeni z chegewara githubu

libraries/Preferences/examples/StartCounter/StartCounter.ino

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+/*
+ ESP32 startup counter example with Preferences library.
+
+ This simple example demonstrates using the Preferences library to store how many times
+ the ESP32 module has booted. The Preferences library is a wrapper around the Non-volatile
+ storage on ESP32 processor.
+
+ created for arduino-esp32 09 Feb 2017
+ by Martin Sloup (Arcao)
+*/
+
+#include <Preferences.h>
+
+Preferences preferences;
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println();
+
+  // Open Preferences with my-app namespace. Each application module, library, etc
+  // has to use a namespace name to prevent key name collisions. We will open storage in
+  // RW-mode (second parameter has to be false).
+  // Note: Namespace name is limited to 15 chars.
+  preferences.begin("my-app", false);
+
+  // Remove all preferences under the opened namespace
+  //preferences.clear();
+
+  // Or remove the counter key only
+  //preferences.remove("counter");
+
+  // Get the counter value, if the key does not exist, return a default value of 0
+  // Note: Key name is limited to 15 chars.
+  unsigned int counter = preferences.getUInt("counter", 0);
+
+  // Increase counter by 1
+  counter++;
+
+  // Print the counter to Serial Monitor
+  Serial.printf("Current counter value: %u\n", counter);
+
+  // Store the counter to the Preferences
+  preferences.putUInt("counter", counter);
+
+  // Close the Preferences
+  preferences.end();
+
+  // Wait 10 seconds
+  Serial.println("Restarting in 10 seconds...");
+  delay(10000);
+
+  // Restart ESP
+  ESP.restart();
+}
+
+void loop() {}