Diff: main.cpp

Revision:

0:57de85b71119

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Mar 09 12:46:57 2016 +0000
@@ -0,0 +1,57 @@
+#include "mbed.h"
+
+//A slight improvement - however, the pressing of the switch still registers
+//spurious falling edges!
+
+void sw1TimeOutHandler();
+void sw1FallingEdge();
+
+
+#define EDGE_RISEN 1
+#define EDGE_FALLEN 0
+
+//Global Objects
+DigitalOut  red_led(D7);
+DigitalOut  green_led(D5);
+InterruptIn   sw1(D4);
+InterruptIn   sw2(D3);
+
+Timeout sw1TimeOut;             //Used to prevent switch bounce
+
+//Interrupt service routine for handling the timeout
+void sw1TimeOutHandler() {
+    sw1TimeOut.detach();        //Stop the timeout counter firing
+    sw1.fall(&sw1FallingEdge);  //Now wait for a falling edge
+}
+
+//Interrupt service routive for SW1 falling edge (release)
+void sw1FallingEdge() {
+    sw1.fall(NULL);                             //Disable this interrupt
+    red_led = !red_led;                         //Toggle LED    
+    sw1TimeOut.attach(&sw1TimeOutHandler, 0.2); //Start timeout counter    
+}
+
+//Main - only has to initialise and sleep
+int main() {
+    //Initial logging message
+    puts("START");
+    
+    //Initial state
+    red_led    = 0; //Set RED LED to OFF
+    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
+
+}