// this code from: // http://www.pjrc.com/teensy/jump_to_bootloader.html #include <avr/io.h> #include <avr/interrupt.h> #include <util/delay.h> void jump_bootloader(void) { cli(); // disable watchdog, if enabled // disable all peripherals UDCON = 1; USBCON = (1<<FRZCLK); // disable USB UCSR1B = 0; _delay_ms(5); #if defined(__AVR_AT90USB162__) // Teensy 1.0 DDRB = 0; DDRC = 0; DDRD = 0; TIMSK0 = 0; TIMSK1 = 0; asm volatile("jmp 0x1F00"); #elif defined(__AVR_ATmega32U4__) // Teensy 2.0 DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; ADCSRA = 0; asm volatile("jmp 0x3F00"); #elif defined(__AVR_AT90USB646__) // Teensy++ 1.0 DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; ADCSRA = 0; asm volatile("jmp 0x7E00"); #elif defined(__AVR_AT90USB1286__) // Teensy++ 2.0 DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; ADCSRA = 0; asm volatile("jmp 0xFE00"); #endif }