Diff: PS2ASCII.cpp

Revision:

0:ea6fa42df9ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PS2ASCII.cpp	Sat Jun 02 09:31:29 2018 +0000
@@ -0,0 +1,132 @@
+#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 == 0xF0)                        //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 == 0xF0)                            //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
+                kbd.wr(0xED);
+                if (_caps && _numlock)
+                    kbd.wr(0x06);
+                else if (_caps && !_numlock)
+                    kbd.wr(0x04);
+                else if (!_caps && _numlock)
+                    kbd.wr(0x02);
+                else
+                    kbd.wr(0x00);                                
+                continue;
+            case 0x77:
+                _numlock = !_numlock;
+                kbd.wr(0xED);
+                if (_caps && _numlock)
+                    kbd.wr(0x06);
+                else if (_caps && !_numlock)
+                    kbd.wr(0x04);
+                else if (!_caps && _numlock)
+                    kbd.wr(0x02);
+                else
+                    kbd.wr(0x00); 
+                continue;
+            default:
+                break;
+        }
+        
+// We do not need shift and caps lock in our project, since we do not use uppercase letters.        
+        
+//        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);    
+              
+    }
+}
+
+unsigned char PS2ASCII::getASCII(unsigned char keypress) {
+    unsigned char character = ps2CharMap[keypress];
+    
+    if (!_E0flag && !_numlock) {
+            if (keypress == 0x70 || keypress == 0x69 || keypress == 0x72 || keypress == 0x7A ||
+                keypress == 0x6B || keypress == 0x73 || keypress == 0x74 || keypress == 0x6C ||
+                keypress == 0x75 || keypress == 0x7D)
+                character = ' ';
+                 
+        }
+        
+    return character;
+}
+    
+bool PS2ASCII::E0flag()
+{
+    return _E0flag;
+}
+
+bool PS2ASCII::numlock()
+{
+    return _numlock;
+}
+     
+bool PS2ASCII::caps() {
+    return _caps;
+}
+
+bool PS2ASCII::shift() {
+    return _shift;     
+}
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