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