mirror of
https://github.com/Keychron/qmk_firmware.git
synced 2024-11-24 09:27:36 +06:00
58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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#include "bootloader.h"
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/* Start Bootloader from Application
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* See
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* http://www.pjrc.com/teensy/jump_to_bootloader.html
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* http://www.fourwalledcubicle.com/files/LUFA/Doc/120219/html/_page__software_bootloader_start.html
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*/
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// TODO: support usbasp
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/* Boot Section Size in bytes
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* Teensy halfKay 512
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* Atmel DFU loader 4096
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* LUFA bootloader 4096
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*/
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#ifndef BOOT_SIZE
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#define BOOT_SIZE 512
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#endif
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#define FLASH_SIZE (FLASHEND + 1)
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#define BOOTLOADER_START (FLASHEND - BOOT_SIZE)
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void bootloader_jump(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__)
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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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#elif defined(__AVR_ATmega32U4__)
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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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#elif defined(__AVR_AT90USB646__)
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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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#elif defined(__AVR_AT90USB1286__)
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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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#endif
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// start Bootloader
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((void (*)(void))BOOTLOADER_START)();
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}
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