1 files changed, 31 insertions, 1 deletions
diff --git a/tmk_core/common/arm_atsam/bootloader.c b/tmk_core/common/arm_atsam/bootloader.c
index 5155d9ff04..9701a62196 100644
--- a/tmk_core/common/arm_atsam/bootloader.c
+++ b/tmk_core/common/arm_atsam/bootloader.c
@@ -15,5 +15,35 @@
  */
 
 #include "bootloader.h"
+#include "samd51j18a.h"
 
-void bootloader_jump(void) {}
+//Set watchdog timer to reset. Directs the bootloader to stay in programming mode.
+void bootloader_jump(void)
+{
+    //Keyboards released with certain bootloader can not enter bootloader from app until workaround is created
+    uint8_t ver_no_jump[] = "v2.18Jun 22 2018 17:28:08";
+    uint8_t *ver_check = ver_no_jump;
+    uint8_t *boot_check = (uint8_t *)0x21A0;
+    while (*ver_check && *boot_check == *ver_check)
+    {
+        ver_check++;
+        boot_check++;
+    }
+    if (!*ver_check)
+    {
+        //Version match
+        //Software workaround would go here
+        return; //No software restart method implemented... must use hardware reset button
+    }
+
+    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
+}