diff options
Diffstat (limited to 'platforms/arm_atsam/bootloaders')
| -rw-r--r-- | platforms/arm_atsam/bootloaders/md_boot.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/platforms/arm_atsam/bootloaders/md_boot.c b/platforms/arm_atsam/bootloaders/md_boot.c new file mode 100644 index 0000000000..9cf16f3597 --- /dev/null +++ b/platforms/arm_atsam/bootloaders/md_boot.c @@ -0,0 +1,65 @@ +/* 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 +} |