arduino-esp32/libraries/Preferences/examples/StartCounter/StartCounter.ino
Joey Babcock 964287727f Small grammar fixes and clarifications (#1003)
* Small grammar fixes and clarifications

Just fixed some small grammar issues in the comments and clarified a few things that might seem confusing.

* More spelling fixes that I introduced...
2018-01-18 00:59:35 +02:00

57 lines
1.5 KiB
C++

/*
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() {}