Revision 1:d090a3a87d87, committed 2013-07-17

Comitter:

jakowisp

Date:

Wed Jul 17 01:49:17 2013 +0000

Parent:

0:717993c337df

Commit message:

Usb Device: Interface, Architecture, protocols and programing.; Homework #1

Changed in this revision

--- a/main.cpp	Mon Feb 11 17:29:01 2013 +0000
+++ b/main.cpp	Wed Jul 17 01:49:17 2013 +0000
@@ -1,12 +1,72 @@
+//Load mbed basic function header
 #include "mbed.h"
+
+//Define the LEDs as a BUS 
+BusOut myleds(LED1, LED2, LED3, LED4);
+DigitalIn updown(p14);
+
+//Define a global count variable
+int cnt=0;
+bool direction=false;
+
  
-BusOut myleds(LED1, LED2, LED3, LED4);
- 
+//Define a generic increment by X function. The functions to increment is passed as a pointer.  The increment amount is passed by value to the function
+void IncrementValueByX(int *value, int x) {
+    *value+=x;
+} 
+
+//Define a generic  wait function using the milliseconds, wait time is passed by value.
+void WaitForTimeInMilliSeconds(int mseconds) {
+    wait_ms(mseconds);
+}
+
+//Define a generic function to assign a nibble to a bus. The BUS is passed by reference and the value is passed 
+//   by value.
+void SetNibbleBusOut(BusOut *nibble,int value) {
+       nibble->write(value & 0xF);
+}
+
+//Determine if a button has been released
+bool CheckButtonRelease(int *buttonState,DigitalIn *inputPin) {
+    int currentButton;
+    bool retValue;
+     
+     currentButton=inputPin->read();
+     if( *buttonState != currentButton && currentButton == 0) {
+        retValue=true;
+     } else {
+        retValue=false;
+     }
+     *buttonState=currentButton; 
+     return retValue;
+}
+
+//Invert a boolean based on a boolean value.
+void InvertBoolBasedonValue(bool *direction, int buttonRelease){
+   if(buttonRelease)
+      *direction= !*direction;
+}
+
+//Change a boolean value based on button release
+void ChangeDirectionOnButtonRelease(bool *direction, DigitalIn *inputPin){
+    bool buttonRelease=0;
+    static int buttonState;
+    
+    buttonRelease=CheckButtonRelease(&buttonState,inputPin);
+    InvertBoolBasedonValue(direction,buttonRelease);
+}
+
+
+//Main loop
 int main() {
-    while(1) {
-        for(int i=0; i<16; i++) {
-            myleds = i;
-            wait(0.25);
-        }
+    while(true) {
+            ChangeDirectionOnButtonRelease(&direction,&updown);       
+            if(direction) {
+               IncrementValueByX(&cnt,1);
+            } else {
+               IncrementValueByX(&cnt,-1);
+            }
+            SetNibbleBusOut(&myleds,cnt);
+            WaitForTimeInMilliSeconds(1000);
     }
-}
\ No newline at end of file
+}