BOOTSEL Button Long Press Detection (Raspberry Pi Pico RP2040)

bootsel-long-press.ino

/*
 * BOOTSEL Button Long Press Detection
 * 
 * This Arduino sketch is based on the bootsel.ino example for the Raspberry Pi Pico RP2040.
 * It detects both short and long presses on the BOOTSEL button and counts the number of each type of press.
 * 
 * Hardware:
 * - Raspberry Pi Pico RP2040
 * 
 * Software Requirements:
 * - Arduino IDE or compatible software
 * - Pico SDK Arduino environment
 * 
 * Instructions:
 * 1. Upload the provided sketch to the Pico board using the Arduino IDE or compatible software.
 * 2. Open the serial monitor to view the output messages.
 * 3. Press the BOOTSEL button for short presses or hold it for long presses to observe the detection results.
 * 
 * Sketch Description:
 * - LONG_PRESS_DURATION: Duration in milliseconds for a press to be considered a long press.
 * - pressCounter: Counter for short presses.
 * - longPressCounter: Counter for long presses.
 * - pressStartTime: Timestamp for press start time.
 * - longPressDetected: Flag indicating a long press.
 * - longPressHandled: Flag indicating if a long press has been handled.
 * 
 * Output:
 * - Short press: "You pressed BOOTSEL [pressCounter] times!"
 * - Long press: "You held BOOTSEL for a long press [longPressCounter] times!"
 * 
 * License:
 * This sketch is released into the public domain.
 */

#include <Arduino.h>
#include "pico/stdlib.h"

#define LONG_PRESS_DURATION 1000  // Duration for a long press in milliseconds

int pressCounter = 0;
int longPressCounter = 0;
unsigned long pressStartTime = 0;
bool longPressDetected = false;
bool longPressHandled = false;

void setup() {
  Serial.begin(115200);
  delay(3000);
  Serial.println("I dare you to long press the BOOTSEL button...");
}

void loop() {
  if (BOOTSEL) {
    pressStartTime = millis();
    while (BOOTSEL) {
      if ((millis() - pressStartTime) > LONG_PRESS_DURATION) {
        longPressDetected = true;
        break;
      }
      delay(1);
    }
    if (longPressDetected && !longPressHandled) {
      Serial.printf("\a\aYou held BOOTSEL for a long press %d times!\n", ++longPressCounter);
      longPressHandled = true;
    } else if (!longPressDetected && !longPressHandled) {
      Serial.printf("\a\aYou pressed BOOTSEL %d times!\n", ++pressCounter);
    }
    longPressDetected = false;
  } else {
    longPressHandled = false;  // Reset the long press handled flag when the button is released
  }
}