/* 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 }