Diff: main.cpp

Revision:

0:cc87c48aa43c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Sep 20 14:06:28 2011 +0000
@@ -0,0 +1,46 @@
+#include "mbed.h"
+#include "PinDetect.h"
+// must import Cookbook PinDetct library into project
+// URL: http://mbed.org/users/AjK/libraries/PinDetect/lkyxpw
+
+DigitalOut myled(LED1);
+DigitalOut myled2(LED2);
+DigitalOut myled3(LED3);
+DigitalOut myled4(LED4);
+
+PinDetect pb(p8);
+// SPST Pushbutton debounced count demo using interrupts and callback
+// no external PullUp resistor needed
+// Pushbutton from P8 to GND.
+// A pb hit generates an interrupt and activates the callback function
+// after the switch is debounced
+
+// Global count variable
+int volatile count=0;
+
+// Callback routine is interrupt activated by a debounced pb hit
+void pb_hit_callback (void) {
+    count++;
+    myled4 = count & 0x01;
+    myled3 = (count & 0x02)>>1;
+    myled2 = (count & 0x04)>>2;
+}
+int main() {
+
+    // Use internal pullup for pushbutton
+    pb.mode(PullUp);
+    // Delay for initial pullup to take effect
+    wait(.01);
+    // Setup Interrupt callback function for a pb hit
+    pb.attach_deasserted(&pb_hit_callback);
+    // Start sampling pb input using interrupts
+    pb.setSampleFrequency();
+
+    //Blink myled in main routine forever while responding to pb changes
+    // via interrupts that activate the callback counter function
+    while (1) {
+        myled = !myled;
+        wait(.5);
+    }
+
+}
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