2 // http://www.pjrc.com/teensy/jump_to_bootloader.html
4 #include <avr/interrupt.h>
5 #include <util/delay.h>
7 void jump_bootloader(void) {
9 // disable watchdog, if enabled
10 // disable all peripherals
12 USBCON = (1<<FRZCLK); // disable USB
15 #if defined(__AVR_AT90USB162__) // Teensy 1.0
16 DDRB = 0; DDRC = 0; DDRD = 0;
17 TIMSK0 = 0; TIMSK1 = 0;
18 asm volatile("jmp 0x1F00");
19 #elif defined(__AVR_ATmega32U4__) // Teensy 2.0
20 DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
21 TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0;
23 asm volatile("jmp 0x3F00");
24 #elif defined(__AVR_AT90USB646__) // Teensy++ 1.0
25 DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
26 TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0;
28 asm volatile("jmp 0x7E00");
29 #elif defined(__AVR_AT90USB1286__) // Teensy++ 2.0
30 DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
31 TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0;
33 asm volatile("jmp 0xFE00");