From b0888a34b5c9584ccbb07419d8890bf8c498ce24 Mon Sep 17 00:00:00 2001
From: "David A. Mellis" <d.mellis@arduino.cc>
Date: Sun, 17 Oct 2010 14:05:46 -0400
Subject: [PATCH] Making attachInterrupt() check registers, not CPUs.

Patch by Mark Sproul, via Christian Maglie.
http://code.google.com/p/arduino/issues/detail?id=340
---
 hardware/arduino/cores/arduino/WInterrupts.c | 50 ++++++++++++++++----
 1 file changed, 42 insertions(+), 8 deletions(-)

diff --git a/hardware/arduino/cores/arduino/WInterrupts.c b/hardware/arduino/cores/arduino/WInterrupts.c
index 9c5741148..3b3e0c9ec 100755
--- a/hardware/arduino/cores/arduino/WInterrupts.c
+++ b/hardware/arduino/cores/arduino/WInterrupts.c
@@ -21,6 +21,7 @@
   Boston, MA  02111-1307  USA
   
   Modified 24 November 2006 by David A. Mellis
+  Modified 1 August 2010 by Mark Sproul
 */
 
 #include <inttypes.h>
@@ -35,11 +36,6 @@
 volatile static voidFuncPtr intFunc[EXTERNAL_NUM_INTERRUPTS];
 // volatile static voidFuncPtr twiIntFunc;
 
-#if defined(__AVR_ATmega8__)
-#define EICRA MCUCR
-#define EIMSK GICR
-#endif
-
 void attachInterrupt(uint8_t interruptNum, void (*userFunc)(void), int mode) {
   if(interruptNum < EXTERNAL_NUM_INTERRUPTS) {
     intFunc[interruptNum] = userFunc;
@@ -52,7 +48,7 @@ void attachInterrupt(uint8_t interruptNum, void (*userFunc)(void), int mode) {
     // Enable the interrupt.
       
     switch (interruptNum) {
-#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+#if defined(EICRA) && defined(EICRB) && defined(EIMSK)
     case 2:
       EICRA = (EICRA & ~((1 << ISC00) | (1 << ISC01))) | (mode << ISC00);
       EIMSK |= (1 << INT0);
@@ -87,12 +83,33 @@ void attachInterrupt(uint8_t interruptNum, void (*userFunc)(void), int mode) {
       break;
 #else
     case 0:
+    #if defined(EICRA) && defined(ISC00) && defined(EIMSK)
       EICRA = (EICRA & ~((1 << ISC00) | (1 << ISC01))) | (mode << ISC00);
       EIMSK |= (1 << INT0);
+    #elif defined(MCUCR) && defined(ISC00) && defined(GICR)
+      MCUCR = (MCUCR & ~((1 << ISC00) | (1 << ISC01))) | (mode << ISC00);
+      GICR |= (1 << INT0);
+    #elif defined(MCUCR) && defined(ISC00) && defined(GIMSK)
+      MCUCR = (MCUCR & ~((1 << ISC00) | (1 << ISC01))) | (mode << ISC00);
+      GIMSK |= (1 << INT0);
+    #else
+      #error attachInterrupt not finished for this CPU (case 0)
+    #endif
       break;
+
     case 1:
+    #if defined(EICRA) && defined(ISC10) && defined(ISC11) && defined(EIMSK)
       EICRA = (EICRA & ~((1 << ISC10) | (1 << ISC11))) | (mode << ISC10);
       EIMSK |= (1 << INT1);
+    #elif defined(MCUCR) && defined(ISC10) && defined(ISC11) && defined(GICR)
+      MCUCR = (MCUCR & ~((1 << ISC10) | (1 << ISC11))) | (mode << ISC10);
+      GICR |= (1 << INT1);
+    #elif defined(MCUCR) && defined(ISC10) && defined(GIMSK) && defined(GIMSK)
+      MCUCR = (MCUCR & ~((1 << ISC10) | (1 << ISC11))) | (mode << ISC10);
+      GIMSK |= (1 << INT1);
+    #else
+      #warning attachInterrupt may need some more work for this cpu (case 1)
+    #endif
       break;
 #endif
     }
@@ -105,7 +122,7 @@ void detachInterrupt(uint8_t interruptNum) {
     // to the number of the EIMSK bit to clear, as this isn't true on the 
     // ATmega8.  There, INT0 is 6 and INT1 is 7.)
     switch (interruptNum) {
-#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+#if defined(EICRA) && defined(EICRB) && defined(EIMSK)
     case 2:
       EIMSK &= ~(1 << INT0);
       break;
@@ -132,10 +149,27 @@ void detachInterrupt(uint8_t interruptNum) {
       break;
 #else
     case 0:
+    #if defined(EIMSK) && defined(INT0)
       EIMSK &= ~(1 << INT0);
+    #elif defined(GICR) && defined(ISC00)
+      GICR &= ~(1 << INT0); // atmega32
+    #elif defined(GIMSK) && defined(INT0)
+      GIMSK &= ~(1 << INT0);
+    #else
+      #error detachInterrupt not finished for this cpu
+    #endif
       break;
+
     case 1:
+    #if defined(EIMSK) && defined(INT1)
       EIMSK &= ~(1 << INT1);
+    #elif defined(GICR) && defined(INT1)
+      GICR &= ~(1 << INT1); // atmega32
+    #elif defined(GIMSK) && defined(INT1)
+      GIMSK &= ~(1 << INT1);
+    #else
+      #warning detachInterrupt may need some more work for this cpu (case 1)
+    #endif
       break;
 #endif
     }
@@ -150,7 +184,7 @@ void attachInterruptTwi(void (*userFunc)(void) ) {
 }
 */
 
-#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+#if defined(EICRA) && defined(EICRB)
 
 SIGNAL(INT0_vect) {
   if(intFunc[EXTERNAL_INT_2])