From 65ef774e8d3a5ef68381d057d4e369a21ab90e18 Mon Sep 17 00:00:00 2001
From: Giuliano Zaro <3684609+GMagician@users.noreply.github.com>
Date: Sat, 2 Nov 2019 12:59:38 +0100
Subject: [PATCH] Fix mega Port J endstop interrupts (#15758)

---
 Marlin/src/HAL/HAL_AVR/endstop_interrupts.h            | 10 +++++-----
 .../share/pin_interrupt_test/pin_interrupt_test.ino    |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/Marlin/src/HAL/HAL_AVR/endstop_interrupts.h b/Marlin/src/HAL/HAL_AVR/endstop_interrupts.h
index 5470a7d7a6..d787456d6b 100644
--- a/Marlin/src/HAL/HAL_AVR/endstop_interrupts.h
+++ b/Marlin/src/HAL/HAL_AVR/endstop_interrupts.h
@@ -46,16 +46,16 @@ void endstop_ISR() { endstops.update(); }
 /**
  * Patch for pins_arduino.h (...\Arduino\hardware\arduino\avr\variants\mega\pins_arduino.h)
  *
- * These macros for the Arduino MEGA do not include the two connected pins on Port J (D13, D14).
+ * These macros for the Arduino MEGA do not include the two connected pins on Port J (D14, D15).
  * So we extend them here because these are the normal pins for Y_MIN and Y_MAX on RAMPS.
  * There are more PCI-enabled processor pins on Port J, but they are not connected to Arduino MEGA.
  */
 #if defined(ARDUINO_AVR_MEGA2560) || defined(ARDUINO_AVR_MEGA)
   #define digitalPinHasPCICR(p)   (WITHIN(p, 10, 15) || WITHIN(p, 50, 53) || WITHIN(p, 62, 69))
-  #define moreDigitalPinToPCICR(p)    digitalPinToPCICR(WITHIN(p, 13, 14) ? 10 : p)
-  #define moreDigitalPinToPCICRbit(p) digitalPinToPCICRbit(p == 13 ? 10 : p == 14 ? 15 : p)
-  #define moreDigitalPinToPCMSK(p)    digitalPinToPCMSK(   p == 13 ? 10 : p == 14 ? 15 : p)
-  #define moreDigitalPinToPCMSKbit(p) digitalPinToPCMSKbit(p == 13 ? 10 : p == 14 ? 51 : p)
+  #define moreDigitalPinToPCICR(p)    digitalPinToPCICR(WITHIN(p, 14, 15) ? 10 : p)
+  #define moreDigitalPinToPCICRbit(p) (WITHIN(p, 14, 15) ? 1 : digitalPinToPCICRbit(p))
+  #define moreDigitalPinToPCMSK(p)    (WITHIN(p, 14, 15) ? (&PCMSK1) : digitalPinToPCMSK(p))
+  #define moreDigitalPinToPCMSKbit(p) digitalPinToPCMSKbit(WITHIN(p, 14, 15) ? (p)+36 : p)
 #endif
 
 
diff --git a/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino b/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino
index 43833ed902..92c69cc90e 100644
--- a/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino
+++ b/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino
@@ -2,7 +2,7 @@
 // Compile with the same build settings you'd use for Marlin.
 
 #if defined(ARDUINO_AVR_MEGA2560) || defined(ARDUINO_AVR_MEGA)
-  #define moreDigitalPinToPCICR(p) digitalPinToPCICR(WITHIN(p, 13, 14) ? 10 : p)
+  #define moreDigitalPinToPCICR(p) digitalPinToPCICR(WITHIN(p, 14, 15) ? 10 : p)
 #else
   #define moreDigitalPinToPCICR(p) digitalPinToPCICR(p)
 #endif