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-rw-r--r--examples/exti-interrupt.cpp51
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diff --git a/examples/exti-interrupt.cpp b/examples/exti-interrupt.cpp
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+// Toggles the built-in LED when the built in button
+// on the Maple is pushed in. This uses the attachInterrupt function to
+// setup the interrupt handler for the button being pressed.
+//
+// More about attachInterrupt:
+// http://leaflabs.com/docs/lang/api/attachinterrupt.html
+//
+
+#include <wirish/wirish.h>
+
+// LED is off by default
+bool isLEDOn = false;
+
+// Interrupt handler takes in nothing and returns nothing.
+void interruptHandler()
+{
+ // Set LED
+ isLEDOn = !isLEDOn;
+ digitalWrite(BOARD_LED_PIN, isLEDOn);
+
+ // Delay slightly for switch debouncing.
+ delay(20);
+}
+
+// Setup pin modes and the interrupt handler
+void setup() {
+ pinMode(BOARD_BUTTON_PIN, INPUT);
+ pinMode(BOARD_LED_PIN, OUTPUT);
+
+ attachInterrupt(BOARD_BUTTON_PIN, interruptHandler, RISING);
+}
+
+// Loop. Does nothing in this example.
+void loop() {
+
+}
+
+// Force init to be called *first*, i.e. before static object allocation.
+// Otherwise, statically allocated objects that need libmaple may fail.
+__attribute__((constructor)) void premain() {
+ init();
+}
+
+int main(void) {
+ setup();
+
+ while (true) {
+ loop();
+ }
+ return 0;
+}