From c1729330c56b27cbdcc904d4faf88dfe80fc60ce Mon Sep 17 00:00:00 2001
From: Victor Oliveira <rhapsodyv@gmail.com>
Date: Sun, 11 Oct 2020 21:31:21 -0300
Subject: [PATCH] Option to prevent (extra) Watchdog init on STM32 (#19693)

---
 Marlin/src/HAL/STM32/watchdog.cpp          | 6 +++++-
 Marlin/src/HAL/STM32F1/watchdog.cpp        | 4 +++-
 Marlin/src/pins/stm32f1/pins_MALYAN_M200.h | 3 +++
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/Marlin/src/HAL/STM32/watchdog.cpp b/Marlin/src/HAL/STM32/watchdog.cpp
index 37e5638b05..cc18553149 100644
--- a/Marlin/src/HAL/STM32/watchdog.cpp
+++ b/Marlin/src/HAL/STM32/watchdog.cpp
@@ -30,7 +30,11 @@
   #include "watchdog.h"
   #include <IWatchdog.h>
 
-  void watchdog_init() { IWatchdog.begin(4000000); } // 4 sec timeout
+  void watchdog_init() {
+    #if DISABLED(DISABLE_WATCHDOG_INIT)
+      IWatchdog.begin(4000000); // 4 sec timeout
+    #endif
+  }
 
   void HAL_watchdog_refresh() {
     IWatchdog.reload();
diff --git a/Marlin/src/HAL/STM32F1/watchdog.cpp b/Marlin/src/HAL/STM32F1/watchdog.cpp
index 4123bc3ef0..ca91a6fe43 100644
--- a/Marlin/src/HAL/STM32F1/watchdog.cpp
+++ b/Marlin/src/HAL/STM32F1/watchdog.cpp
@@ -52,7 +52,9 @@ void watchdogSetup() {
  * @details The watchdog clock is 40Khz. We need a 4 seconds interval, so use a /256 preescaler and 625 reload value (counts down to 0)
  */
 void watchdog_init() {
-  //iwdg_init(IWDG_PRE_256, STM32F1_WD_RELOAD);
+  #if DISABLED(DISABLE_WATCHDOG_INIT)
+    iwdg_init(IWDG_PRE_256, STM32F1_WD_RELOAD);
+  #endif
 }
 
 #endif // USE_WATCHDOG
diff --git a/Marlin/src/pins/stm32f1/pins_MALYAN_M200.h b/Marlin/src/pins/stm32f1/pins_MALYAN_M200.h
index d3c26c497d..95e7e92174 100644
--- a/Marlin/src/pins/stm32f1/pins_MALYAN_M200.h
+++ b/Marlin/src/pins/stm32f1/pins_MALYAN_M200.h
@@ -33,6 +33,9 @@
   #define BOARD_INFO_NAME "Malyan M200"
 #endif
 
+// Prevents hanging from an extra watchdog init
+#define DISABLE_WATCHDOG_INIT
+
 // Assume Flash EEPROM
 #if NO_EEPROM_SELECTED
   #define FLASH_EEPROM_EMULATION