Diff: main.cpp

Revision:

1:e1478ad47f58

Parent:

0:e7ca1ba9745c

--- a/main.cpp	Thu Jan 29 21:09:01 2015 +0000
+++ b/main.cpp	Sun Feb 08 15:44:04 2015 +0000
@@ -1,33 +1,48 @@
+//Part 3
+//This function is used to simply identify whether a specific
+//input from a button is a dot or dash based on the length of
+//time the button is pressed
+
 #include "mbed.h"
 
+//Initialize Interrupt
 InterruptIn pound(p25);
+//Initialize Digital Out
 DigitalOut myled(LED1);
+//Initialize Timers
 Timer t1;
 Timer t2;
 
+//Serial Interface for Debugging
 Serial pc(USBTX, USBRX);
 
+//Function to be called when button is pressed
 void pPress () {
-        t2.stop();
-        if(t2.read_ms() > 400)
-            pc.printf(" ");           
-        t1.start();
-        myled = 1;
+        t2.stop();            //stop space timer
+        if(t2.read_ms() > 400)//if the length is greater than 400ms
+            pc.printf(" ");   //space if added         
+        t1.start();           //start dot/dash timer
+        myled = 1;            //turn on led for debugging
     }
+    
+//Function Called when button is released
 void pRelease() {
-        t1.stop();
-        if(t1.read_ms() > 30 && t1.read_ms() <= 200)
-            pc.printf(".");
+        t1.stop();           //stop dot/dash timer
+        if(t1.read_ms() > 30 && t1.read_ms() <= 200) 
+            pc.printf(".");  //dot if length less than 200ms
         else if (t1.read_ms() > 200)
-            pc.printf("-");
+            pc.printf("-");  //dash if length greater than 200ms
         myled = 0;
-        
+        //reset both timers
         t1.reset();
         t2.reset();
+        //start space timer
         t2.start();
     }
+//mainfunction
 int main() {
     myled = 0;
+    //Initialize Interrupts for rising/falling edge
     pound.rise(&pPress);
     pound.fall(&pRelease);
     t2.start();