Merge branch 'callback_interrupt_handlers'

1 files changed, 50 insertions, 0 deletions

diff --git a/examples/exti-interrupt.cpp b/examples/exti-interrupt.cpp
new file mode 100644
index 0000000..89382d7
--- /dev/null
+++ b/examples/exti-interrupt.cpp
@@ -0,0 +1,50 @@
+// 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;
+}