first commit

libraries/Rocket_Scream_LowPowerAVRZero/examples/PowerDownExternalInterrupt/PowerDownExternalInterrupt.ino

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+#include <RocketScream_LowPowerAVRZero.h>
+
+/* Example on a 32-pin ATMega4808, LED on pin D7 */
+const uint8_t unusedPins[] = {0, 1, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 
+                              14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25};
+volatile bool awake = false;
+
+void setup() 
+{
+  uint8_t index;
+  
+  /* Ensure unused pins are not floating */
+  for (index = 0; index < sizeof(unusedPins); index++)
+  {
+    pinMode(unusedPins[index], INPUT_PULLUP);
+    LowPower.disablePinISC(unusedPins[index]);
+  }
+  
+  /* LED is connected to D7 */
+  pinMode(LED_BUILTIN, OUTPUT);
+  pinMode(2, INPUT_PULLUP);
+  digitalWrite(LED_BUILTIN, LOW);
+  
+  /* Only asynchronous input pin can be used as wake up source during power */
+  /* down. Pin D2, D6, D14, D16, D18, D22 on 32-pin ATMega4808 */
+  attachInterrupt(2, wakeUp, LOW);
+}
+
+void loop() 
+{
+  LowPower.powerDown();
+  if (awake)
+  {
+    awake = false;
+    digitalWrite(LED_BUILTIN, CHANGE);
+  }
+}
+
+void wakeUp(void)
+{
+  awake = true;	
+}