root / arduino-1.0 / hardware / arduino / bootloaders / atmega8 / ATmegaBOOT.c @ 58d82c77
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/**********************************************************/
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/* Serial Bootloader for Atmel mega8 AVR Controller */
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/* */
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/* ATmegaBOOT.c */
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/* */
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/* Copyright (c) 2003, Jason P. Kyle */
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/* */
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/* Hacked by DojoCorp - ZGZ - MMX - IVR */
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/* Hacked by David A. Mellis */
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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 m8 */
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/**********************************************************/
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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/eeprom.h> |
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#include <avr/interrupt.h> |
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#include <avr/delay.h> |
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//#define F_CPU 16000000
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/* We, Malmoitians, like slow interaction
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* therefore the slow baud rate ;-)
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*/
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//#define BAUD_RATE 9600
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/* 6.000.000 is more or less 8 seconds at the
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* speed configured here
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*/
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//#define MAX_TIME_COUNT 6000000
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#define MAX_TIME_COUNT (F_CPU>>1) |
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///#define MAX_TIME_COUNT_MORATORY 1600000
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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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#define HW_VER 0x02 |
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#define SW_MAJOR 0x01 |
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#define SW_MINOR 0x12 |
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// AVR-GCC compiler compatibility
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// avr-gcc compiler v3.1.x and older doesn't support outb() and inb()
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// if necessary, convert outb and inb to outp and inp
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#ifndef outb
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#define outb(sfr,val) (_SFR_BYTE(sfr) = (val))
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#endif
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#ifndef inb
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#define inb(sfr) _SFR_BYTE(sfr)
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#endif
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/* defines for future compatibility */
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#ifndef cbi
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#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
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#endif
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#ifndef sbi
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#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
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#endif
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/* Adjust to suit whatever pin your hardware uses to enter the bootloader */
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#define eeprom_rb(addr) eeprom_read_byte ((uint8_t *)(addr))
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#define eeprom_rw(addr) eeprom_read_word ((uint16_t *)(addr))
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#define eeprom_wb(addr, val) eeprom_write_byte ((uint8_t *)(addr), (uint8_t)(val))
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/* Onboard LED is connected to pin PB5 */
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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 PINB5
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#define SIG1 0x1E // Yep, Atmel is the only manufacturer of AVR micros. Single source :( |
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#define SIG2 0x93 |
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#define SIG3 0x07 |
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#define PAGE_SIZE 0x20U //32 words |
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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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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 bootuart0=0,bootuart1=0;
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void (*app_start)(void) = 0x0000; |
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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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//cbi(BL_DDR,BL);
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//sbi(BL_PORT,BL);
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asm volatile("nop\n\t"); |
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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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/* check if bootloader pin is set low */
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//if(bit_is_set(BL_PIN,BL)) app_start();
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//}
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/* initialize UART(s) depending on CPU defined */
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/* m8 */
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UBRRH = (((F_CPU/BAUD_RATE)/16)-1)>>8; // set baud rate |
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UBRRL = (((F_CPU/BAUD_RATE)/16)-1); |
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UCSRB = (1<<RXEN)|(1<<TXEN); // enable Rx & Tx |
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UCSRC = (1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0); // config USART; 8N1 |
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//UBRRL = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);
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//UBRRH = (F_CPU/(BAUD_RATE*16L)-1) >> 8;
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//UCSRA = 0x00;
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//UCSRC = 0x86;
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//UCSRB = _BV(TXEN)|_BV(RXEN);
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/* this was giving uisp problems, so I removed it; without it, the boot
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works on with uisp and avrdude on the mac (at least). */
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//putch('\0');
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//uint32_t l;
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//uint32_t time_count;
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//time_count=0;
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/* set LED pin as output */
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sbi(LED_DDR,LED); |
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for (i = 0; i < 16; i++) { |
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outb(LED_PORT, inb(LED_PORT) ^ _BV(LED)); |
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_delay_loop_2(0);
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} |
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//for (l=0; l<40000000; l++)
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//outb(LED_PORT, inb(LED_PORT) ^= _BV(LED));
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/* flash onboard LED three times to signal entering of bootloader */
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//for(i=0; i<3; ++i) {
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//for(l=0; l<40000000; ++l);
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//sbi(LED_PORT,LED);
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//for(l=0; l<40000000; ++l);
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//cbi(LED_PORT,LED);
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//}
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/* see comment at previous call to putch() */
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//putch('\0'); // this line is needed for the synchronization of the programmer
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/* forever */
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for (;;) {
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//if((inb(UCSRA) & _BV(RXC))){
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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');
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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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} |
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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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// FIXME: modified only here by DojoCorp, Mumbai, India, 20050626
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//time_count=0; // exted the delay once entered prog.mode
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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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//time_count=MAX_TIME_COUNT_MORATORY; // once the programming is done,
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// we should start the application
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// but uisp has problems with this,
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// therefore we just change the times
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// and give the programmer 1 sec to react
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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_wb(address.word,buff[w]); |
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address.word++; |
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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,EEWE)); //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 words) |
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"lds r31,address+1 \n\t"
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"lsl r30 \n\t" //address * 2 -> byte location |
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"rol r31 \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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"sbrs r24,0 \n\t" //Even up an odd number of bytes |
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"rjmp length_loop \n\t"
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"adiw r24,1 \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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"rcall wait_spm \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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"rcall wait_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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"rcall wait_spm \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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"rcall wait_spm \n\t"
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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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"rcall wait_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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"wait_spm: \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_spm \n\t"
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"ret \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" (SPMCR) : "M" (PAGE_SIZE) : "r0","r16","r17","r24","r25","r28","r29","r30","r31"); |
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/* Should really add a wait for RWW section to be enabled, don't actually need it since we never */
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/* exit the bootloader without a power cycle anyhow */
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} |
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putch(0x14);
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putch(0x10);
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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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length.byte[1] = getch();
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length.byte[0] = getch();
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if (getch() == 'E') flags.eeprom = 1; |
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else {
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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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if (getch() == ' ') { // Command terminator |
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putch(0x14);
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for (w=0;w < length.word;w++) { // Can handle odd and even lengths okay |
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if (flags.eeprom) { // Byte access EEPROM read |
| 421 |
putch(eeprom_rb(address.word)); |
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address.word++; |
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} else {
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if (!flags.rampz) putch(pgm_read_byte_near(address.word));
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address.word++; |
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} |
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} |
| 428 |
putch(0x10);
|
| 429 |
} |
| 430 |
} |
| 431 |
|
| 432 |
/* Get device signature bytes */
|
| 433 |
else if(ch=='u') { |
| 434 |
if (getch() == ' ') { |
| 435 |
putch(0x14);
|
| 436 |
putch(SIG1); |
| 437 |
putch(SIG2); |
| 438 |
putch(SIG3); |
| 439 |
putch(0x10);
|
| 440 |
} |
| 441 |
} |
| 442 |
|
| 443 |
/* Read oscillator calibration byte */
|
| 444 |
else if(ch=='v') { |
| 445 |
byte_response(0x00);
|
| 446 |
} |
| 447 |
// } else {
|
| 448 |
// time_count++;
|
| 449 |
// if (time_count>=MAX_TIME_COUNT) {
|
| 450 |
// app_start();
|
| 451 |
// }
|
| 452 |
// }
|
| 453 |
} /* end of forever loop */
|
| 454 |
} |
| 455 |
|
| 456 |
void putch(char ch) |
| 457 |
{
|
| 458 |
/* m8 */
|
| 459 |
while (!(inb(UCSRA) & _BV(UDRE)));
|
| 460 |
outb(UDR,ch); |
| 461 |
} |
| 462 |
|
| 463 |
char getch(void) |
| 464 |
{
|
| 465 |
/* m8 */
|
| 466 |
uint32_t count = 0;
|
| 467 |
while(!(inb(UCSRA) & _BV(RXC))) {
|
| 468 |
/* HACKME:: here is a good place to count times*/
|
| 469 |
count++; |
| 470 |
if (count > MAX_TIME_COUNT)
|
| 471 |
app_start(); |
| 472 |
} |
| 473 |
return (inb(UDR));
|
| 474 |
} |
| 475 |
|
| 476 |
void getNch(uint8_t count)
|
| 477 |
{
|
| 478 |
uint8_t i; |
| 479 |
for(i=0;i<count;i++) { |
| 480 |
/* m8 */
|
| 481 |
//while(!(inb(UCSRA) & _BV(RXC)));
|
| 482 |
//inb(UDR);
|
| 483 |
getch(); // need to handle time out
|
| 484 |
} |
| 485 |
} |
| 486 |
|
| 487 |
void byte_response(uint8_t val)
|
| 488 |
{
|
| 489 |
if (getch() == ' ') { |
| 490 |
putch(0x14);
|
| 491 |
putch(val); |
| 492 |
putch(0x10);
|
| 493 |
} |
| 494 |
} |
| 495 |
|
| 496 |
void nothing_response(void) |
| 497 |
{
|
| 498 |
if (getch() == ' ') { |
| 499 |
putch(0x14);
|
| 500 |
putch(0x10);
|
| 501 |
} |
| 502 |
} |
| 503 |
|
| 504 |
/* end of file ATmegaBOOT.c */
|
| 505 |
|
| 506 |
|
| 507 |
|