Safe changes from HAL cleanup

Marlin/src/HAL/HAL_STM32_F4_F7/HAL.h

@@ -160,9 +160,6 @@ uint8_t HAL_get_reset_source(void);
 
 void _delay_ms(const int delay);
 
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-function"
-
 /*
 extern "C" {
   int freeMemory(void);
@@ -172,14 +169,17 @@ extern "C" {
 extern "C" char* _sbrk(int incr);
 
 /*
-static int freeMemory() {
+int freeMemory() {
   volatile int top;
   top = (int)((char*)&top - reinterpret_cast<char*>(_sbrk(0)));
   return top;
 }
 */
 
-static int freeMemory() {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-function"
+
+static inline int freeMemory(void) {
   volatile char top;
   return &top - reinterpret_cast<char*>(_sbrk(0));
 }

Marlin/src/HAL/HAL_STM32_F4_F7/fastio_STM32_F4_F7.h

@@ -27,6 +27,10 @@
  * These use GPIO functions instead of Direct Port Manipulation, as on AVR.
  */
 
+#ifndef PWM
+  #define PWM OUTPUT
+#endif
+
 #define READ(IO)                digitalRead(IO)
 #define WRITE(IO,V)             digitalWrite(IO,V)
 
@@ -61,6 +65,8 @@
 #define PORTC 2
 #define PORTD 3
 #define PORTE 4
+#define PORTF 5
+#define PORTG 6
 
 #define _STM32_PIN(P,PN) ((PORT##P * 16) + PN)
 

Marlin/src/HAL/shared/Marduino.h

@@ -31,6 +31,7 @@
 #undef sq             // Redefined by teensy3/wiring.h
 #undef SBI            // Redefined by arduino/const_functions.h
 #undef CBI            // Redefined by arduino/const_functions.h
+#undef UNUSED         // Redefined by stm32f4xx_hal_def.h
 
 #include <Arduino.h>  // NOTE: If included earlier then this line is a NOOP
 
@@ -74,3 +75,8 @@
 #ifndef M_PI
   #define M_PI 3.14159265358979323846f
 #endif
+
+// Remove compiler warning on an unused variable
+#ifndef UNUSED
+  #define UNUSED(x) ((void)(x))
+#endif