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388 lines
10 KiB
388 lines
10 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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#include <util/delay.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_ATmega1284P__)
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#define SIG2 0x97
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#define SIG3 0x05
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#elif 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 it's 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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putch('\r');
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_delay_ms(500);
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}
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/* end of forever loop */
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}
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char gethex(void)
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{
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char ah,al;
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ah = getch();
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putch(ah);
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al = getch();
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putch(al);
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if(ah >= 'a')
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ah = ah - 'a' + 0x0a;
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else if(ah >= '0')
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ah -= '0';
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if(al >= 'a')
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al = al - 'a' + 0x0a;
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else if(al >= '0')
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al -= '0';
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return (ah << 4) + al;
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}
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void puthex(char ch)
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{
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char ah,al;
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ah = (ch & 0xf0) >> 4;
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if(ah >= 0x0a)
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ah = ah - 0x0a + 'a';
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else
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ah += '0';
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al = (ch & 0x0f);
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if(al >= 0x0a)
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al = al - 0x0a + 'a';
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else
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al += '0';
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putch(ah);
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putch(al);
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}
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void putch(char ch)
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{
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while (!(UCSR0A & _BV(UDRE0)));
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UDR0 = ch;
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}
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char getch(void)
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{
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uint32_t count = 0;
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#ifdef ADABOOT
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LED_PORT &= ~_BV(LED); // toggle LED to show activity - BBR/LF 10/3/2007 & 9/13/2008
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#endif
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while(!(UCSR0A & _BV(RXC0)))
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{
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/* 20060803 DojoCorp:: Addon coming from the previous Bootloader*/
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/* HACKME:: here is a good place to count times*/
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count++;
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if (count > MAX_TIME_COUNT)
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app_start();
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}
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#ifdef ADABOOT
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LED_PORT |= _BV(LED); // toggle LED to show activity - BBR/LF 10/3/2007 & 9/13/2008
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#endif
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return UDR0;
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}
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void getNch(uint8_t count)
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{
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uint8_t i;
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for(i=0;i<count;i++)
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{
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while(!(UCSR0A & _BV(RXC0)));
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UDR0;
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}
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}
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void byte_response(uint8_t val)
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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(val);
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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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void nothing_response(void)
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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(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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#ifdef ADABOOT
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void flash_led(uint8_t count)
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{
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/* flash onboard LED count times to signal entering of bootloader */
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/* l needs to be volatile or the delay loops below might get */
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/* optimized away if compiling with optimizations (DAM). */
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volatile uint32_t l;
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if (count == 0) {
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count = ADABOOT;
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}
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int8_t i;
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for (i = 0; i < count; ++i) {
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LED_PORT |= _BV(LED); // LED on
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for(l = 0; l < (F_CPU / 1000); ++l); // delay NGvalue was 1000 for both loops - BBR
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LED_PORT &= ~_BV(LED); // LED off
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for(l = 0; l < (F_CPU / 250); ++l); // delay asymmteric for ADA BOOT BBR
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}
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for(l = 0; l < (F_CPU / 100); ++l); // pause ADA BOOT BBR
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}
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#else
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void flash_led(uint8_t count)
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{
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/* flash onboard LED three times to signal entering of bootloader */
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/* l needs to be volatile or the delay loops below might get
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optimized away if compiling with optimizations (DAM). */
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volatile uint32_t l;
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if (count == 0) {
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count = 3;
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}
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int8_t i;
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for (i = 0; i < count; ++i) {
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LED_PORT |= _BV(LED);
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for(l = 0; l < (F_CPU / 1000); ++l);
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LED_PORT &= ~_BV(LED);
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for(l = 0; l < (F_CPU / 1000); ++l);
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}
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}
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#endif
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/* end of file ATmegaBOOT.c */
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