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https://github.com/nicohood/hoodloader2

16u2 Bootloader to reprogram 16u2 + 328/2560 with Arduino IDE
https://github.com/nicohood/hoodloader2

arduino bootloader usb

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16u2 Bootloader to reprogram 16u2 + 328/2560 with Arduino IDE

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README 

        
HoodLoader2.0.5

===============



![header](header.jpg)



**HoodLoader2 is a CDC BootLoader with self reprogramming and Fast USB-Serial function.**



An Arduino Uno/Mega board has two Microcontroller of which one(16u2) is normally used for USB-Serial translation.

But we can also use it as standalone AVR Microcontroller with (or without) USB functions as well.



HoodLoader2 gives you the option to **reprogram the 16u2** of a normal Arduino Uno/Mega R3 with **custom sketches**.

This means you can use the 16u2 as a normal USB AVR like a Leonardo.

You have a full compatible USB-HID core, CDC Serial and you can also use the 7 i/o pins of the 16u2.

The extended HID devices of the [HID Project](https://github.com/NicoHood/HID) also apply for the HoodLoader2.



The 16u2 is somehow limited in its functions but still a great addition if you know how to use it. It also compatible with

[FastLED](https://github.com/FastLED/FastLED) and [IRLremote](https://github.com/NicoHood/IRLremote)(with PCINT) for example.



The great thing about this is that you actually have **two fully Arduino compatible Microcontrollers in one Arduino Uno/Mega board**

– the board most of you already own. Your IO MCU (328/2560) is **still reprogrammable** if you enter bootloader mode.

All you need for this is a normal Arduino Uno/Mega R3 and some cables to install the new HoodLoader2.



With version 2.0.5 you can now use HoodLoader2 also on a 32u4 which gives you even more power.



Please __read the wiki carefully__ to avoid any problems. You will find most of the answers to your questions already in the wiki.



Buy Me A Coffee



Wiki

====



All documentation moved to the [wiki page](https://github.com/NicoHood/HoodLoader2/wiki) (most up to date documentation).



An offline snapshot (also for older versions) is available in [releases](https://github.com/NicoHood/HoodLoader2/releases)



Contact

=======



Contact information can be found here:



www.nicohood.de



Version History

===============

```

2.0.5 Release (26.09.2015)

* No need for HID-Project anymore, PR3640 added u2 support to IDE 1.6.6

* Added up to 2M baud support (thx to https://github.com/urjaman/fast-usbserial)

* Improved USART reconfiguration

* Changed Magic Key to RAMEND

  (requires new HID-Project IDE patch, but is still backwards compatible)

* Saved a lot of ram by moving descriptors to PROGMEM (8/16u2)

* Added 32u4 support with saver bootkey option and backwards compatibility

* Added at90usb82 support

* Added EEPROM program support for 32u2

* Switch to U2Xn=0 if needed

* Added USB reconnect support

* General improvements to reduce flash size

* Updated and improved Installation sketch

* Added standard Uno/Mega bootloaders

* Removed /tools folder and added information to wiki instead

* Added recompile option to change single/double tab reset

* Added recompile option to change power on behavior

* Added optional old Atmega328 bootloader compatibility(baud 57600),

  only when compiled with a different baud

* Note: Can only be (re)compiled with AVR-GCC 5.1 and LTO (see wiki)



2.0.4 Release (20.03.2015)

* HoodLoader2.0.4

 * Upload verification on USB hubs fix in bootloader

 * Fixed 1 byte buffer overflow

 * Improved installation sketch

 * Moved to Lufa Board definition (with a fix)

* Added HID-Project 2.2 compatibility

 * Added boards.txt for Uno/Mega + HID-Bridge

 * Improved Uno/Mega uploading (no double tab needed any more)

 * Updated USB drivers for better PC side recognition

   (Each USB core has a different PID + Windows driver)

 * Fixed wrong PIDs in boards.txt



2.0.3 Release (28.01.2015)

* Added HID Project 2.1 board definition compatibility

* Fixed usb flag pass via boards.txt (instead of pins_arduino.h)

* Fixed 16u2 4 pin header pinout picture

* DFU burn bootloader fix

* HoodLoader2.0.3 released (minor firmware CDC identifier fix)

* Added 32u2 bootloader to the installation sketch as well

* Improved flash.bat file and included avrdude for windows

* Improved Readme instructions

* Updated USB drivers with 4 different PIDs

* Moved documentation to the wiki



2.0.2 Release (30.11.2014)

* HID Project 2.0 official released:

 * Added Arduino IDE Integration for HoodLoader2

 * See official changelog for more information.

* HoodLoader2.0.2 released (led off fix)



2.0.1 Pre-Release (29.11.2014)

* HoodLoader2.0.1 Release

 * Better, full reset after bootloader execution with watchdog

 * This fixes the "No-USB" workaround with the USB clock

 * Fixed fuse bug

 * Fixed magic key passed from Arduino core (HID Project)

 * Changed some descriptor names, bugfix above freed some space

 * Special case 57600 baud for compatibility with the ATmega328 bootloader TODO resolved (baud reserved for cdc)

 * Reset of 328 when leaving Bootloader mode resolved (not possible to fix)

 * _delay_loop_2() instead delay function resolved (saves 2 bytes, more confusing + inaccurate than useful)

 * CPU_PRESCALE resolved (not needed for bootloader, watchdog will reset it anyways)

 * Re enabled LOCK_BYTE_WRITE_SUPPORT function (due to flash improvements)

 * Increased TX/RX EP_SIZE to 64 bytes

 * Increased Serial->USB Buffer to 128 bytes

* HID Project dev update related to the magic key bugfix

* Updated Atmega board programmer sketch with the new firmware and fuses



2.0.0 Beta-6 Release (05.11.2014)

* Added Arduino-IDE integration workaround for non USB usage



2.0.0 Beta-5 Release (05.11.2014)

* Improved Atmega Bootloader (added stop programming feature)



2.0.0 Beta-4 Release (04.11.2014)

* Improved Atmega Bootloader (Self flashing now works properly)



2.0.0 Beta-3 Release (03.11.2014)

* Improved Atmega Bootloader (DFU now possible)



2.0.0 Beta-2 Release (02.11.2014)

* Added Atmega Bootloader code (no DFU back possible)



2.0.0 Beta-1 Release (02.11.2014)

* Added CDC Bootloader

* Added USB-Serial function

* Made Repository Public



2.0.0 Alpha Release (22.10.2014)

* Added private Github repository with readme

* Added basic functions with dev states

```



License and Copyright

=====================

If you use this library for any cool project let me know!



```

Copyright (c) 2014-2015 NicoHood

See the readme for credit to other people.



This program is free software: you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation, either version 3 of the License, or

(at your option) any later version.



This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.



You should have received a copy of the GNU General Public License

along with this program.  If not, see .

```