Diff: PS2ASCII.cpp

Revision:

0:3774ff2f9a59

diff -r 000000000000 -r 3774ff2f9a59 PS2ASCII.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PS2ASCII.cpp	Sun Jan 30 15:05:39 2011 +0000
@@ -0,0 +1,92 @@
+#include "PS2ASCII.h"
+
+//===================================
+//*Constructor*
+//===================================
+
+PS2ASCII::PS2ASCII(PinName data, PinName clk) : kbd(data,clk) ,_caps(false), _shift(false),  _E0flag(false) ,_numlock(false)
+{
+    
+}
+
+//===================================
+//Functions
+//===================================
+
+unsigned char PS2ASCII::getChar()
+{
+     while(1)
+     {
+         _E0flag = false;
+         unsigned char keypress = kbd.rd();                //code in
+        
+        if(keypress == 0xE0)                            //is it a special E0 key?
+        {
+            keypress = kbd.rd();                        //next byte in
+            if(keypress == NULL)                        //is it a break code?
+            {
+                keypress = kbd.rd();                    //if so chew it up and back to start
+                
+                continue;
+            }
+            
+            _E0flag = true;                                //tell us that it is an E0 function
+            return keypress;
+        }
+        
+        if((keypress == 0x12) || (keypress == 0x59))    //SHIFT pressed?
+        {
+            _shift = true;
+            continue;
+        }
+        
+        if(keypress == NULL)                            //gets rid of byte 1 of break code
+        {
+            keypress = kbd.rd();                        //byte 2 of break code in
+                
+            if((keypress == 0x12) || (keypress == 0x59))
+            {
+                _shift = false;
+            }
+            continue;
+        }
+        
+        switch (keypress) {
+            case 0x58:
+                _caps = !_caps;                            //CAPS LOCK key
+                continue;
+            case 0x80:
+                _numlock = !_numlock;
+                continue;
+            default:
+                break;
+        }
+        
+        unsigned char initial_keypress = keypress;
+        
+        if(_shift == true)                                //if SHIFT is pressed take shifted character
+        {
+            keypress = shift_on[keypress];
+        }
+            
+        if((_caps == true)&&(initial_keypress >= 97)&&(initial_keypress <= 127))
+        {
+            keypress = shift_on[keypress];                //if caps is on shift the letter up
+        }
+            
+        return(keypress);
+        
+    }
+}
+    
+bool PS2ASCII::E0flag()
+{
+    return _E0flag;
+}
+
+bool PS2ASCII::numlock()
+{
+    return _numlock;
+}
+     
+