From f929123a7b10e8bfcaafdc09f7a3368cb2e41bdb Mon Sep 17 00:00:00 2001
From: Jason Smith <jason.inet@gmail.com>
Date: Mon, 30 Nov 2020 22:25:44 -0800
Subject: [PATCH] Prevent Watchdog reset writing Creality 4.x EEPROM (#20328)

---
 Marlin/src/HAL/STM32F1/eeprom_bl24cxx.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Marlin/src/HAL/STM32F1/eeprom_bl24cxx.cpp b/Marlin/src/HAL/STM32F1/eeprom_bl24cxx.cpp
index 94b5e099b..09fe8f910 100644
--- a/Marlin/src/HAL/STM32F1/eeprom_bl24cxx.cpp
+++ b/Marlin/src/HAL/STM32F1/eeprom_bl24cxx.cpp
@@ -48,6 +48,8 @@ bool PersistentStore::access_start()  { eeprom_init(); return true; }
 bool PersistentStore::access_finish() { return true; }
 
 bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
+  size_t written = 0;
+
   while (size--) {
     uint8_t v = *value;
     uint8_t * const p = (uint8_t * const)pos;
@@ -55,7 +57,10 @@ bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, ui
     // so only write bytes that have changed!
     if (v != eeprom_read_byte(p)) {
       eeprom_write_byte(p, v);
-      delay(2);
+      if (++written % 128 == 0)
+        safe_delay(2); // Avoid triggering watchdog during long EEPROM writes
+      else
+        delay(2);
       if (eeprom_read_byte(p) != v) {
         SERIAL_ECHO_MSG(STR_ERR_EEPROM_WRITE);
         return true;