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/**********************************************************/
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/* Serial Bootloader for Atmel megaAVR Controllers */
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/* */
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/* tested with ATmega8, ATmega128 and ATmega168 */
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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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/* build: 060610 */
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/* date : 06.10.2006 */
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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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/* Borrowed and modified for Fun with Robots by bkirby */
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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 m128,m8,m163 - feel free to let me know */
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/* how/if it works for you. */
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/* */
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/**********************************************************/
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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/eeprom.h> |
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#define F_CPU 8000000 |
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#include <util/delay.h> |
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/* set the UART baud rate */
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#define BAUD_RATE 57600 |
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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 0x0f |
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/* Adjust to suit whatever pin your hardware uses to enter the bootloader */
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/* ATmega128 has two UARTS so two pins are used to enter bootloader and select UART */
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/* BL0... means UART0, BL1... means UART1 */
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#define BL_DDR DDRA
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#define BL_PORT PORTA
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#define BL_PIN PINA
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#define BL PINA7
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/* red and green channels of the tricolor*/
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#define LED_DDR DDRD
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#define LED_PORT PORTD
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#define LED_PIN PIND
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#define LED1 PIND4 //red |
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#define LED2 PIND6 //green |
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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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#define SIG2 0x94 |
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#define SIG3 0x0A |
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#define PAGE_SIZE 0x40U //64 words |
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|
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/* function prototypes */
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void putch(char); |
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void putst(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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|
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/* some variables */
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union address_union {
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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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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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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 address_high; |
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uint8_t pagesz=0x80;
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uint8_t i; |
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uint8_t bootuart = 0;
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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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uint8_t ch,ch2; |
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uint16_t w; |
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asm volatile("nop\n\t"); |
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/* set pin direction for bootloader pin and enable pullup */
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BL_DDR &= ~_BV(BL); |
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BL_PORT |= _BV(BL); |
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/* check if flash is programmed already, if not start bootloader anyway */
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if(pgm_read_byte_near(0x0000) != 0xFF) { |
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/* run program if the button is not pressed */
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if(bit_is_set(BL_PIN, BL))
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app_start(); |
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} |
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/* initialize UART */
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UBRR0 = 16;
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UCSR0A = _BV(U2X0); |
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UCSR0B = _BV(TXEN0)|_BV(RXEN0); |
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UCSR0C = 0x06;
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/* set LED pins as output */
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LED_PORT |= _BV(LED1) | _BV(LED2); |
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LED_DDR |= _BV(LED1) | _BV(LED2); |
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/* flash onboard LED to signal entering of bootloader */
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flash_led(3);
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putch('\0');
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/* forever loop */
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for (;;) {
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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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} |
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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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if (getch() == ' ') { |
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putch(0x14);
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putch('A'); putch('V'); putch('R'); putch(' '); |
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putch('I'); putch('S'); putch('P'); putch(0x10); |
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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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ch2 = getch(); |
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if (ch2>0x85) 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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ch2 = getch(); |
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if(ch2==0x80) byte_response(HW_VER); // Hardware version |
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else if(ch2==0x81) byte_response(SW_MAJOR); // Software major version |
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else if(ch2==0x82) byte_response(SW_MINOR); // Software minor version |
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else if(ch2==0x98) byte_response(0x03); // Unknown but seems to be required by avr studio 3.56 |
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else 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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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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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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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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nothing_response(); |
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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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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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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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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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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') flags.eeprom = 1; |
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for (w=0;w<length.word;w++) { |
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buff[w] = getch(); // Store data in buffer, can't keep up with serial data stream whilst programming pages
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} |
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if (getch() == ' ') { |
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if (flags.eeprom) { //Write to EEPROM one byte at a time |
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for(w=0;w<length.word;w++) { |
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eeprom_write_byte((void *)address.word,buff[w]);
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address.word++; |
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} |
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} |
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else { //Write to FLASH one page at a time |
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if (address.byte[1]>127) address_high = 0x01; //Only possible with m128, m256 will need 3rd address byte. FIXME |
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else address_high = 0x00; |
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address.word = address.word << 1; //address * 2 -> byte location |
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if ((length.byte[0] & 0x01)) length.word++; //Even up an odd number of bytes |
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cli(); //Disable interrupts, just to be sure
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while(bit_is_set(EECR,EEPE)); //Wait for previous EEPROM writes to complete |
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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 |
360 |
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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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/* Should really add a wait for RWW section to be enabled, don't actually need it since we never */
|
364 |
/* exit the bootloader without a power cycle anyhow */
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} |
366 |
putch(0x14);
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putch(0x10);
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} |
369 |
} |
370 |
|
371 |
|
372 |
/* Read memory block mode, length is big endian. */
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373 |
else if(ch=='t') { |
374 |
length.byte[1] = getch();
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length.byte[0] = getch();
|
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if (getch() == 'E') flags.eeprom = 1; |
377 |
else {
|
378 |
flags.eeprom = 0;
|
379 |
address.word = address.word << 1; // address * 2 -> byte location |
380 |
} |
381 |
if (getch() == ' ') { // Command terminator |
382 |
putch(0x14);
|
383 |
for (w=0;w < length.word;w++) { // Can handle odd and even lengths okay |
384 |
if (flags.eeprom) { // Byte access EEPROM read |
385 |
putch(eeprom_read_byte((void *)address.word));
|
386 |
address.word++; |
387 |
} |
388 |
else {
|
389 |
|
390 |
if (!flags.rampz) putch(pgm_read_byte_near(address.word));
|
391 |
address.word++; |
392 |
} |
393 |
} |
394 |
putch(0x10);
|
395 |
} |
396 |
} |
397 |
|
398 |
|
399 |
/* Get device signature bytes */
|
400 |
else if(ch=='u') { |
401 |
if (getch() == ' ') { |
402 |
putch(0x14);
|
403 |
putch(SIG1); |
404 |
putch(SIG2); |
405 |
putch(SIG3); |
406 |
putch(0x10);
|
407 |
} |
408 |
} |
409 |
|
410 |
|
411 |
/* Read oscillator calibration byte */
|
412 |
else if(ch=='v') { |
413 |
byte_response(0x00);
|
414 |
} |
415 |
|
416 |
} |
417 |
/* end of forever loop */
|
418 |
|
419 |
} |
420 |
|
421 |
|
422 |
char gethex(void) { |
423 |
char ah,al;
|
424 |
|
425 |
ah = getch(); putch(ah); |
426 |
al = getch(); putch(al); |
427 |
if(ah >= 'a') { |
428 |
ah = ah - 'a' + 0x0a; |
429 |
} else if(ah >= '0') { |
430 |
ah -= '0';
|
431 |
} |
432 |
if(al >= 'a') { |
433 |
al = al - 'a' + 0x0a; |
434 |
} else if(al >= '0') { |
435 |
al -= '0';
|
436 |
} |
437 |
return (ah << 4) + al; |
438 |
} |
439 |
|
440 |
|
441 |
void puthex(char ch) { |
442 |
char ah,al;
|
443 |
|
444 |
ah = (ch & 0xf0) >> 4; |
445 |
if(ah >= 0x0a) { |
446 |
ah = ah - 0x0a + 'a'; |
447 |
} else {
|
448 |
ah += '0';
|
449 |
} |
450 |
al = (ch & 0x0f);
|
451 |
if(al >= 0x0a) { |
452 |
al = al - 0x0a + 'a'; |
453 |
} else {
|
454 |
al += '0';
|
455 |
} |
456 |
putch(ah); |
457 |
putch(al); |
458 |
} |
459 |
|
460 |
|
461 |
void putch(char ch) |
462 |
{ |
463 |
while (!(UCSR0A & _BV(UDRE0)));
|
464 |
UDR0 = ch; |
465 |
} |
466 |
|
467 |
|
468 |
char getch(void) |
469 |
{ |
470 |
while(!(UCSR0A & _BV(RXC0)));
|
471 |
return UDR0;
|
472 |
} |
473 |
|
474 |
|
475 |
void getNch(uint8_t count)
|
476 |
{ |
477 |
uint8_t i; |
478 |
for(i=0;i<count;i++) { |
479 |
while(!(UCSR0A & _BV(RXC0)));
|
480 |
UDR0; |
481 |
} |
482 |
} |
483 |
|
484 |
|
485 |
void byte_response(uint8_t val)
|
486 |
{ |
487 |
if (getch() == ' ') { |
488 |
putch(0x14);
|
489 |
putch(val); |
490 |
putch(0x10);
|
491 |
} |
492 |
} |
493 |
|
494 |
|
495 |
void nothing_response(void) |
496 |
{ |
497 |
if (getch() == ' ') { |
498 |
putch(0x14);
|
499 |
putch(0x10);
|
500 |
} |
501 |
} |
502 |
|
503 |
|
504 |
void flash_led(uint8_t count)
|
505 |
{ |
506 |
/* flash onboard LED three times to signal entering of bootloader */
|
507 |
uint32_t l; |
508 |
int i;
|
509 |
if (count == 0) { |
510 |
count = 3;
|
511 |
} |
512 |
|
513 |
for (i = 0; i < count; ++i) { |
514 |
LED_PORT |= _BV(LED1); |
515 |
LED_PORT &= ~_BV(LED2); |
516 |
for(l = 0; l < (15); ++l) |
517 |
_delay_ms(10);
|
518 |
|
519 |
LED_PORT &= ~_BV(LED1); |
520 |
LED_PORT |= _BV(LED2); |
521 |
for(l = 0; l < (15); ++l) |
522 |
_delay_ms(10);
|
523 |
|
524 |
} |
525 |
} |
526 |
|
527 |
|
528 |
/* end of file ATmegaBOOT.c */
|