Diff: main.cpp

Revision:

1:82e1e022a6d5

Parent:

0:288c00e3c1ae

--- a/main.cpp	Thu Jan 29 22:45:45 2015 +0000
+++ b/main.cpp	Sun Feb 08 16:00:09 2015 +0000
@@ -1,58 +1,71 @@
+//Part 4
+//This code is similar to part 3 but displays the dot
+//or dash on a seven segment display. Again dot or 
+//dash is determined by length of input by user
+
 #include "mbed.h"
 
+//Initialize Interrupt
 InterruptIn pound(p25);
+//Initialize Digital I/O
 DigitalOut myled(LED1);
 DigitalOut dot(p20);
 DigitalOut dash(p19);
-
+//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) {
-            dot = 1;
-            dash= 1;
-            pc.printf(" ");
-        }           
-        t1.start();
-        myled = 1;
-        
+        t2.stop();            //stop space timer
+        if(t2.read_ms() > 400)//if the length is greater than 400ms
+         dot = 1;             //turn of dot
+         dash= 1;             //turn of dash
+         pc.printf(" ");      //space is added         
+        t1.start();           //start dot/dash timer
+        myled = 1;            //turn on led for debugging
     }
+    
+//Function to be called when button is released
 void pRelease() {
-        t1.stop();
+        t1.stop();          //stop dot/dash timer
         if(t1.read_ms() > 30 && t1.read_ms() <= 200){
-            dot = 0;
+            dot = 0;        //turn on dot 
             pc.printf(".");
         }
         else if (t1.read_ms() > 200) {
-            //dash= 0;
-            pc.printf("-");
+            pc.printf("-");   //register dash don't turn on because already on
         }
+        //delay for stability
         wait(0.1);
+        
+        //reset timers
         t1.reset();
         t2.reset();
         
-        dot = 1;
-        //dash = 1;
-        myled = 0;
-        
+        dot = 1;              //turn dot off
+        dash = 1;             //turn dash off
+        myled = 0;            //turn off led
+        //start space timer
         t2.start();
     }
 int main() {
+    //Int State for LEDs
     dot=1;
     dash=1;
     myled = 0;
+    //Initialize Inturrupt funct rise/fall edge
     pound.rise(&pPress);
     pound.fall(&pRelease);
-    t2.start();
+    t2.start();     //start space timer
     while(1) {
-        if(t1.read_ms()> 200) {
-            dash = 0;
-            wait(0.1);
-            dash = 1;
+        if(t1.read_ms()> 200) { //if this is true then button is depressed still 
+            dash = 0;           //dash is registered
+            wait(0.1);          //wait short duration for stability
+            dash = 1;           //turn off then back on if still depressed
             }
     }
 }
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