pjrc/jump_bootloader.c

   1 /* See  http://www.pjrc.com/teensy/jump_to_bootloader.html */
   2 #include <avr/io.h>
   3 #include <avr/interrupt.h>
   4 #include <util/delay.h>
   5
   6 void jump_bootloader(void) {
   7     cli();
   8     // disable watchdog, if enabled
   9     // disable all peripherals
  10     UDCON = 1;
  11     USBCON = (1<<FRZCLK);  // disable USB
  12     UCSR1B = 0;
  13     _delay_ms(5);
  14 #if defined(__AVR_AT90USB162__)                // Teensy 1.0
  15     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
  16     TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
  17     DDRB = 0; DDRC = 0; DDRD = 0;
  18     PORTB = 0; PORTC = 0; PORTD = 0;
  19     asm volatile("jmp 0x3E00");
  20 #elif defined(__AVR_ATmega32U4__)              // Teensy 2.0
  21     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
  22     TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
  23     DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
  24     PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
  25     asm volatile("jmp 0x7E00");
  26 #elif defined(__AVR_AT90USB646__)              // Teensy++ 1.0
  27     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
  28     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
  29     DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
  30     PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
  31     asm volatile("jmp 0xFC00");
  32 #elif defined(__AVR_AT90USB1286__)             // Teensy++ 2.0
  33     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
  34     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
  35     DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
  36     PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
  37     asm volatile("jmp 0x1FC00");
  38 #endif
  39 }