1 files changed, 32 insertions, 0 deletions
diff --git a/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino b/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino
new file mode 100644
index 0000000..6dcfb67
--- /dev/null
+++ b/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino
@@ -0,0 +1,32 @@
+// Search pins usable for endstop-interrupts
+// Compile with the same build settings you'd use for Marlin.
+
+#if defined(ARDUINO_AVR_MEGA2560) || defined(ARDUINO_AVR_MEGA)
+    #undef  digitalPinToPCICR
+    #define digitalPinToPCICR(p)    ( ((p) >= 10 && (p) <= 15) || \
+                                      ((p) >= 50 && (p) <= 53) || \
+                                      ((p) >= 62 && (p) <= 69) ? (&PCICR) : nullptr)
+#endif
+
+void setup() {
+  Serial.begin(9600);
+  Serial.println("PINs causing interrupts are:");
+  for (int i = 2; i < NUM_DIGITAL_PINS; i++) {
+    if (digitalPinToPCICR(i) || (int)digitalPinToInterrupt(i) != -1) {
+      for (int j = 0; j < NUM_ANALOG_INPUTS; j++) {
+        if (analogInputToDigitalPin(j) == i) {
+          Serial.print('A');
+          Serial.print(j);
+          Serial.print(" = ");
+        }
+      }
+      Serial.print('D');
+      Serial.println(i);
+    }
+  }
+  Serial.println("Arduino pin numbering!");
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+}