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