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/* Copyright 2017 Fred Sundvik
*
* 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 2 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 "samd51j18a.h"
// WARNING: These are only for CTRL bootloader release "v2.18Jun 22 2018 17:28:08" for bootloader_jump support
extern uint32_t _eram;
#define BOOTLOADER_MAGIC 0x3B9ACA00
#define MAGIC_ADDR (uint32_t *)((intptr_t)(&_eram) - 4)
// CTRL keyboards released with bootloader version below must use RAM method. Otherwise use WDT method.
void bootloader_jump(void) {
#ifdef KEYBOARD_massdrop_ctrl
uint8_t ver_ram_method[] = "v2.18Jun 22 2018 17:28:08"; // The version to match (NULL terminated by compiler)
uint8_t *ver_check = ver_ram_method; // Pointer to version match string for traversal
uint8_t *ver_rom = (uint8_t *)0x21A0; // Pointer to address in ROM where this specific bootloader version would exist
while (*ver_check && *ver_rom == *ver_check) { // While there are check version characters to match and bootloader's version matches check's version
ver_check++; // Move check version pointer to next character
ver_rom++; // Move ROM version pointer to next character
}
if (!*ver_check) { // If check version pointer is NULL, all characters have matched
*MAGIC_ADDR = BOOTLOADER_MAGIC; // Set magic number into RAM
NVIC_SystemReset(); // Perform system reset
while (1)
; // Won't get here
}
#endif
// Set watchdog timer to reset. Directs the bootloader to stay in programming mode.
WDT->CTRLA.bit.ENABLE = 0;
while (WDT->SYNCBUSY.bit.ENABLE)
;
while (WDT->CTRLA.bit.ENABLE)
;
WDT->CONFIG.bit.WINDOW = 0;
WDT->CONFIG.bit.PER = 0;
WDT->EWCTRL.bit.EWOFFSET = 0;
WDT->CTRLA.bit.ENABLE = 1;
while (WDT->SYNCBUSY.bit.ENABLE)
;
while (!WDT->CTRLA.bit.ENABLE)
;
while (1)
; // Wait on timeout
}
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