59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/* gc_n64_usb : Gamecube or N64 controller to USB adapter firmware
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Copyright (C) 2007-2021 Raphael Assenat <raph@raphnet.net>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/wdt.h>
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#include <util/delay.h>
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#include "usb.h"
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void enterBootLoader(void)
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{
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cli();
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usb_shutdown();
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_delay_ms(10);
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#if defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega32U4__)
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// ATmega32u2 : 0x3800
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asm volatile(
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"cli \n"
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"ldi r30, 0x00 \n" // ZL
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"ldi r31, 0x38 \n" // ZH
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"ijmp");
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#elif defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
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// AT90USB1287/1286 : 0xF000 (word address)
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asm volatile(
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"cli \n"
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"ldi r30, 0x00 \n" // ZL
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"ldi r31, 0xF0 \n" // ZH
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"ijmp");
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#else
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#error Bootloader address unknown for this CPU
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#endif
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}
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void resetFirmware(void)
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{
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usb_shutdown();
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// jump to the application reset vector
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asm volatile(
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"cli \n"
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"ldi r30, 0x00 \n" // ZL
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"ldi r31, 0x00 \n" // ZH
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"ijmp");
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}
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