Diff: main.cpp

Revision:

0:24ccc6d0c391

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Mar 09 11:56:33 2016 +0000
@@ -0,0 +1,41 @@
+#include "mbed.h"
+
+// This uses INTERRUPTS to detect a falling edge of the switch input
+// However, pressing and releasing the switch can result in spurious falling edges
+// which trigger the routine 
+
+//Declare functions
+void sw1FallingEdge();
+
+//Global Objects
+DigitalOut  red_led(D7);
+DigitalOut  green_led(D5);
+InterruptIn   sw1(D4);
+
+//Interrupt service routine for a rising edge (press)
+void sw1FallingEdge() {
+    red_led = !red_led;     //Toggle the LED
+}
+
+//Main - only has to initialise and sleep
+int main() {
+    //Initial logging message
+    puts("START");
+    red_led   = 0;
+    green_led = 1;
+    
+    //Configure interrupts, wait for first rising edge
+    sw1.fall(&sw1FallingEdge);
+    
+    //Main Polling Loop
+    while (true) {
+        
+        //Put CPU back to sleep
+        sleep();
+        
+        //You can ONLY reach this point if an ISR wakes the CPU
+        puts("ISR just woke the MPU");
+        
+    } //end while
+
+}