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