141 lines
3.7 KiB
C
141 lines
3.7 KiB
C
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#include <avr/io.h>
|
|
#include <avr/interrupt.h>
|
|
#include <avr/wdt.h>
|
|
#include <util/delay.h>
|
|
#include "bootloader.h"
|
|
|
|
#ifdef PROTOCOL_LUFA
|
|
#include <LUFA/Drivers/USB/USB.h>
|
|
#endif
|
|
|
|
|
|
/* Boot Section Size in bytes
|
|
* Teensy halfKay 512
|
|
* Atmel DFU loader 4096
|
|
* LUFA bootloader 4096
|
|
*/
|
|
#ifndef BOOT_SIZE
|
|
#define BOOT_SIZE 512
|
|
#endif
|
|
#define FLASH_SIZE (FLASHEND + 1)
|
|
#define BOOTLOADER_START (FLASH_SIZE - BOOT_SIZE)
|
|
|
|
|
|
/*
|
|
* Entering the Bootloader via Software
|
|
* http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
|
|
*/
|
|
#define BOOTLOADER_RESET_KEY 0xB007B007
|
|
uint32_t reset_key __attribute__ ((section (".noinit")));
|
|
|
|
/* initialize MCU status by watchdog reset */
|
|
void bootloader_jump(void) {
|
|
#ifdef PROTOCOL_LUFA
|
|
USB_Disable();
|
|
cli();
|
|
_delay_ms(2000);
|
|
#endif
|
|
|
|
#ifdef PROTOCOL_PJRC
|
|
cli();
|
|
UDCON = 1;
|
|
USBCON = (1<<FRZCLK);
|
|
UCSR1B = 0;
|
|
_delay_ms(5);
|
|
#endif
|
|
|
|
// watchdog reset
|
|
reset_key = BOOTLOADER_RESET_KEY;
|
|
wdt_enable(WDTO_250MS);
|
|
for (;;);
|
|
}
|
|
|
|
|
|
/* this runs before main() */
|
|
void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3")));
|
|
void bootloader_jump_after_watchdog_reset(void)
|
|
{
|
|
if ((MCUSR & (1<<WDRF)) && reset_key == BOOTLOADER_RESET_KEY) {
|
|
|
|
#if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
|
|
// This makes custom USBasploader come up.
|
|
MCUSR = 0;
|
|
#endif
|
|
|
|
reset_key = 0;
|
|
((void (*)(void))BOOTLOADER_START)();
|
|
}
|
|
}
|
|
|
|
|
|
#if 0
|
|
/* Jumping To The Bootloader
|
|
* http://www.pjrc.com/teensy/jump_to_bootloader.html
|
|
*
|
|
* This method doen't work when using LUFA. idk why.
|
|
* - needs to initialize more regisers or interrupt setting?
|
|
*/
|
|
void bootloader_jump(void) {
|
|
#ifdef PROTOCOL_LUFA
|
|
USB_Disable();
|
|
cli();
|
|
_delay_ms(2000);
|
|
#endif
|
|
|
|
#ifdef PROTOCOL_PJRC
|
|
cli();
|
|
UDCON = 1;
|
|
USBCON = (1<<FRZCLK);
|
|
UCSR1B = 0;
|
|
_delay_ms(5);
|
|
#endif
|
|
|
|
/*
|
|
* Initialize
|
|
*/
|
|
#if defined(__AVR_AT90USB162__)
|
|
EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
|
|
TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
|
|
DDRB = 0; DDRC = 0; DDRD = 0;
|
|
PORTB = 0; PORTC = 0; PORTD = 0;
|
|
#elif defined(__AVR_ATmega32U4__)
|
|
EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
|
|
TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
|
|
DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
|
|
PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
|
|
#elif defined(__AVR_AT90USB646__)
|
|
EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
|
|
TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
|
|
DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
|
|
PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
|
|
#elif defined(__AVR_AT90USB1286__)
|
|
EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
|
|
TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
|
|
DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
|
|
PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
|
|
#endif
|
|
|
|
/*
|
|
* USBaspLoader
|
|
*/
|
|
#if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
|
|
// This makes custom USBasploader come up.
|
|
MCUSR = 0;
|
|
|
|
// initialize ports
|
|
PORTB = 0; PORTC= 0; PORTD = 0;
|
|
DDRB = 0; DDRC= 0; DDRD = 0;
|
|
|
|
// disable interrupts
|
|
EIMSK = 0; EECR = 0; SPCR = 0;
|
|
ACSR = 0; SPMCSR = 0; WDTCSR = 0; PCICR = 0;
|
|
TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0;
|
|
ADCSRA = 0; TWCR = 0; UCSR0B = 0;
|
|
#endif
|
|
|
|
// start Bootloader
|
|
((void (*)(void))BOOTLOADER_START)();
|
|
}
|
|
#endif
|