4 #include <avr/interrupt.h>
6 #include <util/delay.h>
7 #include "bootloader.h"
10 #include <LUFA/Drivers/USB/USB.h>
14 /* Boot Section Size in *BYTEs*
16 * Teensy++ halfKay 1024
17 * Atmel DFU loader 4096
18 * LUFA bootloader 4096
21 #ifndef BOOTLOADER_SIZE
22 #warning To use bootloader_jump() you need to define BOOTLOADER_SIZE in config.h.
23 #define BOOTLOADER_SIZE 4096
26 #define FLASH_SIZE (FLASHEND + 1L)
27 #define BOOTLOADER_START (FLASH_SIZE - BOOTLOADER_SIZE)
31 * Entering the Bootloader via Software
32 * http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
34 #define BOOTLOADER_RESET_KEY 0xB007B007
35 uint32_t reset_key __attribute__ ((section (".noinit")));
37 /* initialize MCU status by watchdog reset */
38 void bootloader_jump(void) {
54 reset_key = BOOTLOADER_RESET_KEY;
55 wdt_enable(WDTO_250MS);
60 /* this runs before main() */
61 void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3")));
62 void bootloader_jump_after_watchdog_reset(void)
64 if ((MCUSR & (1<<WDRF)) && reset_key == BOOTLOADER_RESET_KEY) {
67 // My custom USBasploader requires this to come up.
70 // Seems like Teensy halfkay loader requires clearing WDRF and disabling watchdog.
74 ((void (*)(void))BOOTLOADER_START)();
80 /* Jumping To The Bootloader
81 * http://www.pjrc.com/teensy/jump_to_bootloader.html
83 * This method doen't work when using LUFA. idk why.
84 * - needs to initialize more regisers or interrupt setting?
86 void bootloader_jump(void) {
104 #if defined(__AVR_AT90USB162__)
105 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
106 TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
107 DDRB = 0; DDRC = 0; DDRD = 0;
108 PORTB = 0; PORTC = 0; PORTD = 0;
109 #elif defined(__AVR_ATmega32U4__)
110 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
111 TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
112 DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
113 PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
114 #elif defined(__AVR_AT90USB646__)
115 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
116 TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
117 DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
118 PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
119 #elif defined(__AVR_AT90USB1286__)
120 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
121 TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
122 DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
123 PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
129 #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
130 // This makes custom USBasploader come up.
134 PORTB = 0; PORTC= 0; PORTD = 0;
135 DDRB = 0; DDRC= 0; DDRD = 0;
137 // disable interrupts
138 EIMSK = 0; EECR = 0; SPCR = 0;
139 ACSR = 0; SPMCSR = 0; WDTCSR = 0; PCICR = 0;
140 TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0;
141 ADCSRA = 0; TWCR = 0; UCSR0B = 0;
145 ((void (*)(void))BOOTLOADER_START)();