Use a macro for HAL header redirection (#10380)

Marlin/src/HAL/HAL_LPC1768/HAL.h

@@ -28,6 +28,8 @@
 #ifndef _HAL_LPC1768_H_
 #define _HAL_LPC1768_H_
 
+#define CPU_32_BIT
+
 // --------------------------------------------------------------------------
 // Includes
 // --------------------------------------------------------------------------
@@ -58,6 +60,8 @@ extern "C" volatile uint32_t _millis;
 #include <Arduino.h>
 #include <pinmapping.h>
 
+#include "../math_32bit.h"
+#include "../HAL_SPI.h"
 #include "fastio.h"
 #include "watchdog.h"
 #include "serial.h"

Marlin/src/HAL/HAL_LPC1768/endstop_interrupts.h

@@ -34,8 +34,22 @@
  * (Located in Marlin/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino)
  */
 
- #ifndef _ENDSTOP_INTERRUPTS_H_
- #define _ENDSTOP_INTERRUPTS_H_
+#ifndef _ENDSTOP_INTERRUPTS_H_
+#define _ENDSTOP_INTERRUPTS_H_
+
+//Currently this is untested and broken
+#error "Please disable Endstop Interrupts LPC176x is currently an unsupported platform"
+
+volatile uint8_t e_hit = 0; // Different from 0 when the endstops should be tested in detail.
+                            // Must be reset to 0 by the test function when finished.
+
+// This is what is really done inside the interrupts.
+FORCE_INLINE void endstop_ISR_worker( void ) {
+  e_hit = 2; // Because the detection of a e-stop hit has a 1 step debouncer it has to be called at least twice.
+}
+
+// One ISR for all EXT-Interrupts
+void endstop_ISR(void) { endstop_ISR_worker(); }
 
 void setup_endstop_interrupts(void) {
   #if HAS_X_MAX