- /* 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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