From c759729478b7b41a4f6d276380249dd482e24bb8 Mon Sep 17 00:00:00 2001
From: Tanguy Pruvot <tpruvot@users.noreply.github.com>
Date: Tue, 31 Mar 2020 21:13:20 +0200
Subject: [PATCH] STM32F1: Restore M43 build support (#17336)

---
 Marlin/src/gcode/config/M43.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/Marlin/src/gcode/config/M43.cpp b/Marlin/src/gcode/config/M43.cpp
index 2c28da62f..baf5efb13 100644
--- a/Marlin/src/gcode/config/M43.cpp
+++ b/Marlin/src/gcode/config/M43.cpp
@@ -67,7 +67,11 @@ inline void toggle_pins() {
     else {
       watchdog_refresh();
       report_pin_state_extended(pin, ignore_protection, true, PSTR("Pulsing   "));
-      const bool prior_mode = GET_PINMODE(pin);
+      #ifdef __STM32F1__
+        const auto prior_mode = _GET_MODE(i);
+      #else
+        const bool prior_mode = GET_PINMODE(pin);
+      #endif
       #if AVR_AT90USB1286_FAMILY // Teensy IDEs don't know about these pins so must use FASTIO
         if (pin == TEENSY_E2) {
           SET_OUTPUT(TEENSY_E2);
@@ -96,7 +100,11 @@ inline void toggle_pins() {
           watchdog_refresh();
         }
       }
-      pinMode(pin, prior_mode);
+      #ifdef __STM32F1__
+        _SET_MODE(i, prior_mode);
+      #else
+        pinMode(pin, prior_mode);
+      #endif
     }
     SERIAL_EOL();
   }