Cách xóa Hoodloader2 cho con Atmega16u2/Atmega32u4 trên Arduino Uno / Mega của bạn

Mình tham khảo đoạn code.

/*
  Copyright (c) 2015 NicoHood
  See the readme for credit to other people.
  HoodLoader2 Run Bootloader example
  Starts Bootloader mode.
  This is useful if you only want to use
  the Fast USB-Serial bridge again.
  https://github.com/NicoHood/HoodLoader2/blob/master/avr/examples/RunBootloader/RunBootloader.ino
  You could delete the firmware with avrdude,
  but this sketch is way simpler to upload for beginners.
  
  It forces a watchdog reset,
  meaning the bootloader is started completely independant.
*/

#include <avr/wdt.h>

void setup() {
  // close interrupts
  cli();

  // write magic key to ram
  *(uint16_t*)MAGIC_KEY_POS = 0x7777;

  // watchdog reset
  wdt_enable(WDTO_120MS);
}

void loop() {
  // wait for reset
}

Bạn bật Arduino lên và nạp đoạn code kia cho Arduino USB MCU (atmega16u2/atmega32u4) là ok.