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714 lines
18 KiB
714 lines
18 KiB
/**********************************************************/
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/* Serial Bootloader for Atmel megaAVR Controllers */
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/* */
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/* tested with ATmega644 and ATmega644P */
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/* should work with other mega's, see code for details */
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/* */
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/* ATmegaBOOT.c */
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/* */
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/* 20090131: Added 324P support from Alex Leone */
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/* Marius Kintel */
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/* 20080915: applied ADABoot mods for Sanguino 644P */
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/* Brian Riley */
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/* 20080711: hacked for Sanguino by Zach Smith */
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/* and Justin Day */
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/* 20070626: hacked for Arduino Diecimila (which auto- */
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/* resets when a USB connection is made to it) */
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/* by D. Mellis */
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/* 20060802: hacked for Arduino by D. Cuartielles */
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/* based on a previous hack by D. Mellis */
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/* and D. Cuartielles */
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/* */
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/* Monitor and debug functions were added to the original */
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/* code by Dr. Erik Lins, chip45.com. (See below) */
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/* */
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/* Thanks to Karl Pitrich for fixing a bootloader pin */
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/* problem and more informative LED blinking! */
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/* */
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/* For the latest version see: */
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/* http://www.chip45.com/ */
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/* */
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/* ------------------------------------------------------ */
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/* */
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/* based on stk500boot.c */
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/* Copyright (c) 2003, Jason P. Kyle */
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/* All rights reserved. */
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/* see avr1.org for original file and information */
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/* */
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/* This program is free software; you can redistribute it */
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/* and/or modify it under the terms of the GNU General */
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/* Public License as published by the Free Software */
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/* Foundation; either version 2 of the License, or */
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/* (at your option) any later version. */
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/* */
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/* This program is distributed in the hope that it will */
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/* be useful, but WITHOUT ANY WARRANTY; without even the */
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/* implied warranty of MERCHANTABILITY or FITNESS FOR A */
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/* PARTICULAR PURPOSE. See the GNU General Public */
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/* License for more details. */
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/* */
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/* You should have received a copy of the GNU General */
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/* Public License along with this program; if not, write */
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/* to the Free Software Foundation, Inc., */
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/* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* */
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/* Licence can be viewed at */
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/* http://www.fsf.org/licenses/gpl.txt */
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/* */
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/* Target = Atmel AVR m128,m64,m32,m16,m8,m162,m163,m169, */
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/* m8515,m8535. ATmega161 has a very small boot block so */
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/* isn't supported. */
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/* */
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/* Tested with m168 */
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/**********************************************************/
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/* $Id$ */
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/* some includes */
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#include <inttypes.h>
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#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include <avr/interrupt.h>
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#include <avr/wdt.h>
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#include <avr/boot.h>
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#ifdef ADABOOT
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#define NUM_LED_FLASHES 3
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#define ADABOOT_VER 1
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#endif
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/* 20070707: hacked by David A. Mellis - after this many errors give up and launch application */
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#define MAX_ERROR_COUNT 5
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/* set the UART baud rate */
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/* 20080711: hack by Zach Hoeken */
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#define BAUD_RATE 38400
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/* SW_MAJOR and MINOR needs to be updated from time to time to avoid warning message from AVR Studio */
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/* never allow AVR Studio to do an update !!!! */
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#define HW_VER 0x02
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#define SW_MAJOR 0x01
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#define SW_MINOR 0x10
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/* onboard LED is used to indicate, that the bootloader was entered (3x flashing) */
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/* if monitor functions are included, LED goes on after monitor was entered */
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#define LED_DDR DDRB
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#define LED_PORT PORTB
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#define LED_PIN PINB
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#define LED PINB0
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/* define various device id's */
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/* manufacturer byte is always the same */
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#define SIG1 0x1E // Yep, Atmel is the only manufacturer of AVR micros. Single source :(
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#if defined(__AVR_ATmega644P__)
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#define SIG2 0x96
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#define SIG3 0x0A
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#elif defined(__AVR_ATmega644__)
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#define SIG2 0x96
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#define SIG3 0x09
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#elif defined(__AVR_ATmega324P__)
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#define SIG2 0x95
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#define SIG3 0x08
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#endif
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#define PAGE_SIZE 0x080U //128 words
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#define PAGE_SIZE_BYTES 0x100U //256 bytes
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/* function prototypes */
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void putch(char);
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char getch(void);
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void getNch(uint8_t);
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void byte_response(uint8_t);
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void nothing_response(void);
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char gethex(void);
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void puthex(char);
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void flash_led(uint8_t);
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/* some variables */
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union address_union
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{
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uint16_t word;
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uint8_t byte[2];
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} address;
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union length_union
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{
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uint16_t word;
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uint8_t byte[2];
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} length;
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struct flags_struct
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{
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unsigned eeprom : 1;
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unsigned rampz : 1;
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} flags;
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uint8_t buff[256];
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uint8_t error_count = 0;
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uint8_t sreg;
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void (*app_start)(void) = 0x0000;
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/* main program starts here */
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int main(void)
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{
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uint8_t ch,ch2;
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uint16_t w;
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uint16_t i;
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asm volatile("nop\n\t");
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#ifdef ADABOOT // BBR/LF 10/8/2007 & 9/13/2008
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ch = MCUSR;
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MCUSR = 0;
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WDTCSR |= _BV(WDCE) | _BV(WDE);
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WDTCSR = 0;
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// Check if the WDT was used to reset, in which case we dont bootload and skip straight to the code. woot.
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if (! (ch & _BV(EXTRF))) // if its a not an external reset...
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app_start(); // skip bootloader
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#endif
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//initialize our serial port.
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UBRR0L = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);
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UBRR0H = (F_CPU/(BAUD_RATE*16L)-1) >> 8;
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UCSR0B = (1<<RXEN0) | (1<<TXEN0);
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UCSR0C = (1<<UCSZ00) | (1<<UCSZ01);
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/* Enable internal pull-up resistor on pin D0 (RX), in order
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to supress line noise that prevents the bootloader from
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timing out (DAM: 20070509) */
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DDRD &= ~_BV(PIND0);
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PORTD |= _BV(PIND0);
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/* set LED pin as output */
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LED_DDR |= _BV(LED);
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/* flash onboard LED to signal entering of bootloader */
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/* ADABOOT will do two series of flashes. first 4 - signifying ADABOOT */
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/* then a pause and another flash series signifying ADABOOT sub-version */
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flash_led(NUM_LED_FLASHES);
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#ifdef ADABOOT
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flash_led(ADABOOT_VER); // BBR 9/13/2008
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#endif
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/* forever loop */
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for (;;)
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{
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/* get character from UART */
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ch = getch();
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/* A bunch of if...else if... gives smaller code than switch...case ! */
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/* Hello is anyone home ? */
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if(ch=='0')
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nothing_response();
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/* Request programmer ID */
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/* Not using PROGMEM string due to boot block in m128 being beyond 64kB boundry */
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/* Would need to selectively manipulate RAMPZ, and it's only 9 characters anyway so who cares. */
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else if(ch=='1')
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{
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if (getch() == ' ')
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{
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putch(0x14);
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putch('A');
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putch('V');
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putch('R');
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putch(' ');
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putch('I');
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putch('S');
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putch('P');
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putch(0x10);
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}
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else
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{
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if (++error_count == MAX_ERROR_COUNT)
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app_start();
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}
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}
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/* AVR ISP/STK500 board commands DON'T CARE so default nothing_response */
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else if(ch=='@')
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{
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ch2 = getch();
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if (ch2 > 0x85)
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getch();
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nothing_response();
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}
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/* AVR ISP/STK500 board requests */
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else if(ch=='A')
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{
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ch2 = getch();
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if(ch2 == 0x80)
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byte_response(HW_VER); // Hardware version
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else if(ch2==0x81)
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byte_response(SW_MAJOR); // Software major version
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else if(ch2==0x82)
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byte_response(SW_MINOR); // Software minor version
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else if(ch2==0x98)
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byte_response(0x03); // Unknown but seems to be required by avr studio 3.56
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else
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byte_response(0x00); // Covers various unnecessary responses we don't care about
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}
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/* Device Parameters DON'T CARE, DEVICE IS FIXED */
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else if(ch=='B')
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{
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getNch(20);
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nothing_response();
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}
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/* Parallel programming stuff DON'T CARE */
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else if(ch=='E')
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{
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getNch(5);
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nothing_response();
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}
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/* Enter programming mode */
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else if(ch=='P')
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{
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nothing_response();
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}
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/* Leave programming mode */
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else if(ch=='Q')
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{
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nothing_response();
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#ifdef ADABOOT
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// autoreset via watchdog (sneaky!) BBR/LF 9/13/2008
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WDTCSR = _BV(WDE);
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while (1); // 16 ms
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#endif
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}
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/* Erase device, don't care as we will erase one page at a time anyway. */
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else if(ch=='R')
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{
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nothing_response();
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}
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/* Set address, little endian. EEPROM in bytes, FLASH in words */
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/* Perhaps extra address bytes may be added in future to support > 128kB FLASH. */
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/* This might explain why little endian was used here, big endian used everywhere else. */
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else if(ch=='U')
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{
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address.byte[0] = getch();
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address.byte[1] = getch();
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nothing_response();
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}
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/* Universal SPI programming command, disabled. Would be used for fuses and lock bits. */
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else if(ch=='V')
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{
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getNch(4);
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byte_response(0x00);
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}
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/* Write memory, length is big endian and is in bytes */
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else if(ch=='d')
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{
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length.byte[1] = getch();
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length.byte[0] = getch();
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flags.eeprom = 0;
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if (getch() == 'E')
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flags.eeprom = 1;
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for (i=0; i<PAGE_SIZE; i++)
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buff[i] = 0;
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for (w = 0; w < length.word; w++)
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{
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// Store data in buffer, can't keep up with serial data stream whilst programming pages
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buff[w] = getch();
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}
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if (getch() == ' ')
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{
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if (flags.eeprom)
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{
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//Write to EEPROM one byte at a time
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for(w=0;w<length.word;w++)
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{
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while(EECR & (1<<EEPE));
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EEAR = (uint16_t)(void *)address.word;
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EEDR = buff[w];
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EECR |= (1<<EEMPE);
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EECR |= (1<<EEPE);
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address.word++;
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}
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}
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else
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{
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//address * 2 -> byte location
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address.word = address.word << 1;
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//Even up an odd number of bytes
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if ((length.byte[0] & 0x01))
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length.word++;
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// HACKME: EEPE used to be EEWE
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//Wait for previous EEPROM writes to complete
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//while(bit_is_set(EECR,EEPE));
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while(EECR & (1<<EEPE));
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asm volatile(
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"clr r17 \n\t" //page_word_count
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"lds r30,address \n\t" //Address of FLASH location (in bytes)
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"lds r31,address+1 \n\t"
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"ldi r28,lo8(buff) \n\t" //Start of buffer array in RAM
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"ldi r29,hi8(buff) \n\t"
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"lds r24,length \n\t" //Length of data to be written (in bytes)
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"lds r25,length+1 \n\t"
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"length_loop: \n\t" //Main loop, repeat for number of words in block
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"cpi r17,0x00 \n\t" //If page_word_count=0 then erase page
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"brne no_page_erase \n\t"
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"wait_spm1: \n\t"
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"lds r16,%0 \n\t" //Wait for previous spm to complete
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"andi r16,1 \n\t"
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"cpi r16,1 \n\t"
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"breq wait_spm1 \n\t"
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"ldi r16,0x03 \n\t" //Erase page pointed to by Z
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"sts %0,r16 \n\t"
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"spm \n\t"
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"wait_spm2: \n\t"
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"lds r16,%0 \n\t" //Wait for previous spm to complete
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"andi r16,1 \n\t"
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"cpi r16,1 \n\t"
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"breq wait_spm2 \n\t"
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"ldi r16,0x11 \n\t" //Re-enable RWW section
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"sts %0,r16 \n\t"
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"spm \n\t"
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"no_page_erase: \n\t"
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"ld r0,Y+ \n\t" //Write 2 bytes into page buffer
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"ld r1,Y+ \n\t"
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"wait_spm3: \n\t"
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"lds r16,%0 \n\t" //Wait for previous spm to complete
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"andi r16,1 \n\t"
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"cpi r16,1 \n\t"
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"breq wait_spm3 \n\t"
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"ldi r16,0x01 \n\t" //Load r0,r1 into FLASH page buffer
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"sts %0,r16 \n\t"
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"spm \n\t"
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"inc r17 \n\t" //page_word_count++
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"cpi r17,%1 \n\t"
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"brlo same_page \n\t" //Still same page in FLASH
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"write_page: \n\t"
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"clr r17 \n\t" //New page, write current one first
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"wait_spm4: \n\t"
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"lds r16,%0 \n\t" //Wait for previous spm to complete
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"andi r16,1 \n\t"
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"cpi r16,1 \n\t"
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"breq wait_spm4 \n\t"
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"ldi r16,0x05 \n\t" //Write page pointed to by Z
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"sts %0,r16 \n\t"
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"spm \n\t"
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"wait_spm5: \n\t"
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"lds r16,%0 \n\t" //Wait for previous spm to complete
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"andi r16,1 \n\t"
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"cpi r16,1 \n\t"
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"breq wait_spm5 \n\t"
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"ldi r16,0x11 \n\t" //Re-enable RWW section
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"sts %0,r16 \n\t"
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"spm \n\t"
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"same_page: \n\t"
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"adiw r30,2 \n\t" //Next word in FLASH
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"sbiw r24,2 \n\t" //length-2
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"breq final_write \n\t" //Finished
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"rjmp length_loop \n\t"
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"final_write: \n\t"
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"cpi r17,0 \n\t"
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"breq block_done \n\t"
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"adiw r24,2 \n\t" //length+2, fool above check on length after short page write
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"rjmp write_page \n\t"
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"block_done: \n\t"
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"clr __zero_reg__ \n\t" //restore zero register
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: "=m" (SPMCSR) : "M" (PAGE_SIZE) : "r0","r16","r17","r24","r25","r28","r29","r30","r31"
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);
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}
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putch(0x14);
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putch(0x10);
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}
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else
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{
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if (++error_count == MAX_ERROR_COUNT)
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app_start();
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}
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}
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/* Read memory block mode, length is big endian. */
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else if(ch=='t')
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{
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length.byte[1] = getch();
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length.byte[0] = getch();
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if (getch() == 'E')
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flags.eeprom = 1;
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else
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{
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flags.eeprom = 0;
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address.word = address.word << 1; // address * 2 -> byte location
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}
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// Command terminator
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if (getch() == ' ')
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{
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putch(0x14);
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for (w=0; w<length.word; w++)
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{
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// Can handle odd and even lengths okay
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if (flags.eeprom)
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{
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// Byte access EEPROM read
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while(EECR & (1<<EEPE));
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EEAR = (uint16_t)(void *)address.word;
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EECR |= (1<<EERE);
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putch(EEDR);
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address.word++;
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}
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else
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{
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if (!flags.rampz)
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putch(pgm_read_byte_near(address.word));
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address.word++;
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}
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}
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putch(0x10);
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}
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}
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/* Get device signature bytes */
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else if(ch=='u')
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{
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if (getch() == ' ')
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{
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putch(0x14);
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putch(SIG1);
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putch(SIG2);
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putch(SIG3);
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putch(0x10);
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}
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else
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{
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if (++error_count == MAX_ERROR_COUNT)
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app_start();
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}
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}
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|
|
|
|
|
/* Read oscillator calibration byte */
|
|
else if(ch=='v')
|
|
byte_response(0x00);
|
|
|
|
else if (++error_count == MAX_ERROR_COUNT)
|
|
app_start();
|
|
|
|
}
|
|
/* end of forever loop */
|
|
}
|
|
|
|
|
|
char gethex(void)
|
|
{
|
|
char ah,al;
|
|
|
|
ah = getch();
|
|
putch(ah);
|
|
al = getch();
|
|
putch(al);
|
|
|
|
if(ah >= 'a')
|
|
ah = ah - 'a' + 0x0a;
|
|
else if(ah >= '0')
|
|
ah -= '0';
|
|
if(al >= 'a')
|
|
al = al - 'a' + 0x0a;
|
|
else if(al >= '0')
|
|
al -= '0';
|
|
|
|
return (ah << 4) + al;
|
|
}
|
|
|
|
|
|
void puthex(char ch)
|
|
{
|
|
char ah,al;
|
|
|
|
ah = (ch & 0xf0) >> 4;
|
|
if(ah >= 0x0a)
|
|
ah = ah - 0x0a + 'a';
|
|
else
|
|
ah += '0';
|
|
|
|
al = (ch & 0x0f);
|
|
if(al >= 0x0a)
|
|
al = al - 0x0a + 'a';
|
|
else
|
|
al += '0';
|
|
|
|
putch(ah);
|
|
putch(al);
|
|
}
|
|
|
|
|
|
void putch(char ch)
|
|
{
|
|
while (!(UCSR0A & _BV(UDRE0)));
|
|
UDR0 = ch;
|
|
}
|
|
|
|
|
|
|
|
|
|
char getch(void)
|
|
{
|
|
uint32_t count = 0;
|
|
|
|
#ifdef ADABOOT
|
|
LED_PORT &= ~_BV(LED); // toggle LED to show activity - BBR/LF 10/3/2007 & 9/13/2008
|
|
#endif
|
|
|
|
while(!(UCSR0A & _BV(RXC0)))
|
|
{
|
|
/* 20060803 DojoCorp:: Addon coming from the previous Bootloader*/
|
|
/* HACKME:: here is a good place to count times*/
|
|
count++;
|
|
if (count > MAX_TIME_COUNT)
|
|
app_start();
|
|
}
|
|
|
|
#ifdef ADABOOT
|
|
LED_PORT |= _BV(LED); // toggle LED to show activity - BBR/LF 10/3/2007 & 9/13/2008
|
|
#endif
|
|
|
|
return UDR0;
|
|
}
|
|
|
|
|
|
void getNch(uint8_t count)
|
|
{
|
|
uint8_t i;
|
|
for(i=0;i<count;i++)
|
|
{
|
|
while(!(UCSR0A & _BV(RXC0)));
|
|
UDR0;
|
|
}
|
|
}
|
|
|
|
|
|
void byte_response(uint8_t val)
|
|
{
|
|
if (getch() == ' ')
|
|
{
|
|
putch(0x14);
|
|
putch(val);
|
|
putch(0x10);
|
|
}
|
|
else
|
|
{
|
|
if (++error_count == MAX_ERROR_COUNT)
|
|
app_start();
|
|
}
|
|
}
|
|
|
|
|
|
void nothing_response(void)
|
|
{
|
|
if (getch() == ' ')
|
|
{
|
|
putch(0x14);
|
|
putch(0x10);
|
|
}
|
|
else
|
|
{
|
|
if (++error_count == MAX_ERROR_COUNT)
|
|
app_start();
|
|
}
|
|
}
|
|
|
|
#ifdef ADABOOT
|
|
|
|
void flash_led(uint8_t count)
|
|
{
|
|
/* flash onboard LED count times to signal entering of bootloader */
|
|
/* l needs to be volatile or the delay loops below might get */
|
|
/* optimized away if compiling with optimizations (DAM). */
|
|
|
|
volatile uint32_t l;
|
|
|
|
if (count == 0) {
|
|
count = ADABOOT;
|
|
}
|
|
|
|
|
|
int8_t i;
|
|
for (i = 0; i < count; ++i) {
|
|
LED_PORT |= _BV(LED); // LED on
|
|
for(l = 0; l < (F_CPU / 1000); ++l); // delay NGvalue was 1000 for both loops - BBR
|
|
LED_PORT &= ~_BV(LED); // LED off
|
|
for(l = 0; l < (F_CPU / 250); ++l); // delay asymmteric for ADA BOOT BBR
|
|
}
|
|
|
|
for(l = 0; l < (F_CPU / 100); ++l); // pause ADA BOOT BBR
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
void flash_led(uint8_t count)
|
|
{
|
|
/* flash onboard LED three times to signal entering of bootloader */
|
|
/* l needs to be volatile or the delay loops below might get
|
|
optimized away if compiling with optimizations (DAM). */
|
|
volatile uint32_t l;
|
|
|
|
if (count == 0) {
|
|
count = 3;
|
|
}
|
|
|
|
int8_t i;
|
|
for (i = 0; i < count; ++i) {
|
|
LED_PORT |= _BV(LED);
|
|
for(l = 0; l < (F_CPU / 1000); ++l);
|
|
LED_PORT &= ~_BV(LED);
|
|
for(l = 0; l < (F_CPU / 1000); ++l);
|
|
}
|
|
|
|
}
|
|
|
|
|
|
#endif
|
|
|
|
|
|
/* end of file ATmegaBOOT.c */
|