summaryrefslogtreecommitdiff
path: root/platforms/arm_atsam/bootloaders/md_boot.c
diff options
context:
space:
mode:
Diffstat (limited to 'platforms/arm_atsam/bootloaders/md_boot.c')
-rw-r--r--platforms/arm_atsam/bootloaders/md_boot.c65
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
+}