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/* Optiboot bootloader for Arduino                        */
/*                                                        */
/* http://optiboot.googlecode.com                         */
/*                                                        */
/* Arduino-maintained version : See README.TXT            */
/* http://code.google.com/p/arduino/                      */
/*  It is the intent that changes not relevant to the     */
/*  Arduino production environment get moved from the     */
/*  optiboot project to the arduino project in "lumps."   */
/*                                                        */
/* Heavily optimised bootloader that is faster and        */
/* smaller than the Arduino standard bootloader           */
/*                                                        */
/* Enhancements:                                          */
/*   Fits in 512 bytes, saving 1.5K of code space         */
/*   Higher baud rate speeds up programming               */
/*   Written almost entirely in C                         */
/*   Customisable timeout with accurate timeconstant      */
/*                                                        */
/* What you lose:                                         */
/*   Implements a skeleton STK500 protocol which is       */
/*     missing several features including EEPROM          */
/*     programming and non-page-aligned writes            */
/*   High baud rate breaks compatibility with standard    */
/*     Arduino flash settings                             */
/*                                                        */
/* Copyright 2013-2019 by Bill Westfield.                 */
/* Copyright 2010 by Peter Knight.                        */
/*                                                        */
/* 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 2 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, write  */
/* to the Free Software Foundation, Inc.,                 */
/* 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA */
/*                                                        */
/* Licence can be viewed at                               */
/* http://www.fsf.org/licenses/gpl.txt                    */
/*                                                        */
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/*                                                        */
/* Optional defines:                                      */
/*                                                        */
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/*                                                        */
/* BIGBOOT:                                               */
/* Build a 1k bootloader, not 512 bytes. This turns on    */
/* extra functionality.                                   */
/*                                                        */
/* BAUD_RATE:                                             */
/* Set bootloader baud rate.                              */
/*                                                        */
/* LED_START_FLASHES:                                     */
/* Number of LED flashes on bootup.                       */
/*                                                        */
/* LED_DATA_FLASH:                                        */
/* Flash LED when transferring data. For boards without   */
/* TX or RX LEDs, or for people who like blinky lights.   */
/*                                                        */
/* TIMEOUT_MS:                                            */
/* Bootloader timeout period, in milliseconds.            */
/* 500,1000,2000,4000,8000 supported.                     */
/*                                                        */
/* UART:                                                  */
/* UART number (0..n) for devices with more than          */
/* one hardware uart (644P, 1284P, etc)                   */
/*                                                        */
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