minimal.ino

/****************************************************************************************************************************
  minimal.ino
  DoubleResetDetector_Generic.h
  For AVR Mega, Teensy, STM32, nRF52, SAM DUE, SAMD21, SAMD51 boards

  DoubleResetDetector_Generic is a library for the Arduino AVR, Teensy, SAM-DUE, SAMD, STM32. etc. boards
  to enable trigger configure mode by resetting the boards twice within configurable timeout seconds.

  Based on and modified from DataCute https://github.com/datacute/DoubleResetDetector and
  https://github.com/khoih-prog/ESP_DoubleResetDetector

  Built by Khoi Hoang https://github.com/khoih-prog/DoubleResetDetector_Generic
  Licensed under MIT license
 *****************************************************************************************************************************/
/****************************************************************************************************************************
   This example will open a configuration portal when the reset button is pressed twice.
   This method works well on Wemos boards which have a single reset button on board. It avoids using a pin for launching the configuration portal.

   How It Works
   1) AVR Mega, Teensy
   Save data in EPPROM from address 1020, size 1024 bytes (both configurable)
   Note: Teensy 4.0 has only 1080 bytes of EEPROM-simulated Flash
   2) SAMD
   Save data in EEPROM-simulated FlashStorage from address 0 (configurable to avoid conflict)
   3) SAM DUE
   Save data in DueFlashStorage from address 1020 (configurable to avoid conflict)
   4) Adafruit nRF52-based boards
   Save data in InternalFS, fle "/drd.dat" location 0
   5) RTL8720
   Save data in FlashStorage from address 0 (configurable to avoid conflict)
   6) STM32
   Save data in EEPROM-simulated FlashStorage from address 0 (configurable to avoid conflict)

   So when the device starts up it checks the InternalFS file "/drd.dat", EEPROM or (Due)FlashStorage for a flag to see if it has been
   recently reset within the configurable timeout seconds
   It'll then set a flag, and display a message to signal if the DR is detected

   Settings
   There are two values to be set in the sketch.

   DRD_TIMEOUT - Number of seconds to wait for the second reset. Set to 10s in the example.
   DRD_ADDRESS - The address in ESP8266 RTC RAM to store the flag. This memory must not be used for other purposes in the same sketch. Set to 0 in the example.

   This example, originally relied on the Double Reset Detector library from https://github.com/datacute/DoubleResetDetector
   To support ESP32, use ESP_DoubleResetDetector library from https://github.com/khoih-prog/ESP_DoubleResetDetector
   To support AVR, Teensy, SAM DUE, SAMD and STM32, etc., use this DoubleResetDetector_Generic from //https://github.com/khoih-prog/DoubleResetDetector_Generic
 *****************************************************************************************************************************/

#define DRD_GENERIC_DEBUG       true  //false

// You have to select true for the first time for any board
#define FORCE_REFORMAT          false


#include <DoubleResetDetector_Generic.h>

// Number of seconds after reset during which a
// subseqent reset will be considered a double reset.
#define DRD_TIMEOUT         10

// RTC Memory Address for the DoubleResetDetector to use
#define DRD_ADDRESS         0

DoubleResetDetector_Generic* drd;

#ifndef LED_BUILTIN
  #define LED_BUILTIN       25  //13
#endif

void setup()
{
  pinMode(LED_BUILTIN, OUTPUT);

  Serial.begin(115200);

  while (!Serial);

  Serial.println();

#if defined(BOARD_NAME)
  Serial.print(F("DoubleResetDetector minimal Example Program on "));
  Serial.println(BOARD_NAME);
#else
  Serial.println(F("DoubleResetDetector minimal Example Program"));
#endif

  Serial.println(DOUBLERESETDETECTOR_GENERIC_VERSION);
  Serial.println("-----------------------------------");

  drd = new DoubleResetDetector_Generic(DRD_TIMEOUT, DRD_ADDRESS);

  if (drd->detectDoubleReset())
  {
    Serial.println("Double Reset Detected");
    digitalWrite(LED_BUILTIN, LOW);
  }
  else
  {
    Serial.println("No Double Reset Detected");
    digitalWrite(LED_BUILTIN, HIGH);
  }
}

void loop()
{
  // Call the double reset detector loop method every so often,
  // so that it can recognise when the timeout expires.
  // You can also call drd.stop() when you wish to no longer
  // consider the next reset as a double reset.
  drd->loop();
}