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https://github.com/moparisthebest/tmk_keyboard
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41 lines
1.7 KiB
C
41 lines
1.7 KiB
C
// 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(void) {
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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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EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
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TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
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DDRB = 0; DDRC = 0; DDRD = 0;
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PORTB = 0; PORTC = 0; PORTD = 0;
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asm volatile("jmp 0x3E00");
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#elif defined(__AVR_ATmega32U4__) // Teensy 2.0
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EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
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TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
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DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
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PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
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asm volatile("jmp 0x7E00");
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#elif defined(__AVR_AT90USB646__) // Teensy++ 1.0
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EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
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TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
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DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
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PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
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asm volatile("jmp 0xFC00");
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#elif defined(__AVR_AT90USB1286__) // Teensy++ 2.0
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EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
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TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
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DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
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PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
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asm volatile("jmp 0x1FC00");
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#endif
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}
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