Marlin must override _BV for 32-bit masks!

Marlin/src/HAL/HAL_STM32F7/HAL_STM32F7.h

   #define NUM_SERIAL 1
 #endif
 
-#define _BV(bit) (1 << (bit))
+#define _BV(b) (1UL << (b))
 
 /**
  * TODO: review this to return 1 for pins that are not analog input

Marlin/src/HAL/HAL_STM32F7/fastio_STM32F7.h

 #ifndef _FASTIO_STM32F7_H
 #define _FASTIO_STM32F7_H
 
-#define _BV(bit) (1 << (bit))
+#define _BV(b) (1UL << (b))
 
 #define READ(IO)              digitalRead(IO)
 #define WRITE(IO, v)          digitalWrite(IO,v)

Marlin/src/core/macros.h

 #define STRINGIFY(M) STRINGIFY_(M)
 
 // Macros for bit masks
-#ifndef _BV
-  #define _BV(n)  (1<<(n))
-#endif
+#undef _BV // Marlin needs 32-bit unsigned!
+#define _BV(b) (1UL << (b))
 #define TEST(n,b) (((n)&_BV(b))!=0)
 #define SBI(n,b) (n |= _BV(b))
 #define CBI(n,b) (n &= ~_BV(b))