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arduino-cli/libraries/PinChangeInterrupt/examples/PinChangeInterrupt_LowLevel/PinChangeInterrupt_LowLevel.ino

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+/*
+ Copyright (c) 2014-2015 NicoHood
+ See the readme for credit to other people.
+
+ PinChangeInterrupt_LowLevel
+ Demonstrates how to use the library without the API
+
+ Make sure to comment "//#define PCINT_API" in the settings file.
+
+ To maximize speed and size also uncomment all not used pins above.
+ Then you could also uncomment "#define PCINT_COMPILE_ENABLED_ISR"
+ to get away the .a linkage overhead.
+
+ Connect a button/cable to pin 7 and ground (Uno).
+ Strong overwritten callback functions are called when an interrupt occurs.
+ The Led state will change if the pin state does.
+
+ PinChangeInterrupts are different than normal Interrupts.
+ See readme for more information.
+ Dont use Serial or delay inside interrupts!
+ This library is not compatible with SoftSerial.
+
+ The following pins are usable for PinChangeInterrupt:
+ Arduino Uno/Nano/Mini: All pins are usable
+ Arduino Mega: 10, 11, 12, 13, 50, 51, 52, 53, A8 (62), A9 (63), A10 (64),
+               A11 (65), A12 (66), A13 (67), A14 (68), A15 (69)
+ Arduino Leonardo/Micro: 8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI)
+ HoodLoader2: All (broken out 1-7) pins are usable
+ Attiny 24/44/84: All pins are usable
+ Attiny 25/45/85: All pins are usable
+ Attiny 13: All pins are usable
+ Attiny 441/841: All pins are usable
+ ATmega644P/ATmega1284P: All pins are usable
+ */
+
+#include "PinChangeInterrupt.h"
+
+// choose a valid PinChangeInterrupt pin of your Arduino board
+// manually defined pcint number
+#define pinBlink 7
+#define interruptBlink 23
+
+void setup()
+{
+  // set pin to input with a pullup, led to output
+  pinMode(pinBlink, INPUT_PULLUP);
+  pinMode(LED_BUILTIN, OUTPUT);
+
+  // attach the new PinChangeInterrupts and enable event functions below
+  attachPinChangeInterrupt(interruptBlink, CHANGE);
+}
+
+void PinChangeInterruptEvent(interruptBlink)(void) {
+  // switch Led state
+  digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
+}
+
+void loop() {
+  // nothing to do here
+}