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qmk_firmware/jump_bootloader.c

36 lines
1.1 KiB

// 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() {
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
}