mirror of
https://github.com/qmk/qmk_firmware
synced 2024-11-18 01:46:09 +00:00
65 lines
2.4 KiB
C
65 lines
2.4 KiB
C
/* Copyright 2021 QMK
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "bootloader.h"
|
|
|
|
#include <avr/wdt.h>
|
|
|
|
#define FLASH_SIZE (FLASHEND + 1L)
|
|
|
|
#if !defined(MCUCSR)
|
|
# if defined(MCUSR)
|
|
# define MCUCSR MCUSR
|
|
# endif
|
|
#endif
|
|
|
|
__attribute__((weak)) void bootloader_jump(void) {
|
|
// Taken with permission of Stephan Baerwolf from https://github.com/tinyusbboard/API/blob/master/apipage.c
|
|
|
|
wdt_enable(WDTO_15MS);
|
|
wdt_reset();
|
|
asm volatile("cli \n\t"
|
|
"ldi r29 , %[ramendhi] \n\t"
|
|
"ldi r28 , %[ramendlo] \n\t"
|
|
#if (FLASHEND > 131071)
|
|
"ldi r18 , %[bootaddrhi] \n\t"
|
|
"st Y+, r18 \n\t"
|
|
#endif
|
|
"ldi r18 , %[bootaddrme] \n\t"
|
|
"st Y+, r18 \n\t"
|
|
"ldi r18 , %[bootaddrlo] \n\t"
|
|
"st Y+, r18 \n\t"
|
|
"out %[mcucsrio], __zero_reg__ \n\t"
|
|
"bootloader_startup_loop%=: \n\t"
|
|
"rjmp bootloader_startup_loop%= \n\t"
|
|
:
|
|
: [mcucsrio] "I"(_SFR_IO_ADDR(MCUCSR)),
|
|
#if (FLASHEND > 131071)
|
|
[ramendhi] "M"(((RAMEND - 2) >> 8) & 0xff), [ramendlo] "M"(((RAMEND - 2) >> 0) & 0xff), [bootaddrhi] "M"((((FLASH_SIZE - BOOTLOADER_SIZE) >> 1) >> 16) & 0xff),
|
|
#else
|
|
[ramendhi] "M"(((RAMEND - 1) >> 8) & 0xff), [ramendlo] "M"(((RAMEND - 1) >> 0) & 0xff),
|
|
#endif
|
|
[bootaddrme] "M"((((FLASH_SIZE - BOOTLOADER_SIZE) >> 1) >> 8) & 0xff), [bootaddrlo] "M"((((FLASH_SIZE - BOOTLOADER_SIZE) >> 1) >> 0) & 0xff));
|
|
}
|
|
|
|
__attribute__((weak)) void mcu_reset(void) {
|
|
// setup watchdog timeout
|
|
wdt_enable(WDTO_15MS);
|
|
|
|
// wait for watchdog timer to trigger
|
|
while (1) {
|
|
}
|
|
}
|