yuhang zhu / Mbed 2 deprecated ADAM_menu

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Dependencies:   mbed

Diff: main.cpp

Revision:
21:4d6b26eecdac
Parent:
18:452b5da21cfd
Child:
23:0b6901c9302c
--- a/main.cpp	Fri Jul 19 21:25:24 2013 +0000
+++ b/main.cpp	Sat Jul 20 16:20:14 2013 +0000
@@ -106,11 +106,14 @@
                            
                         break;  
                     }
-                    else if(recv == 8)   //backspace is pressed, delete one character both on screen and line buffer
+                    else if(recv == 8 || recv == 127)   //backspace is pressed, delete one character both on screen and line buffer
                     {
-                        pc.putc(8);
-                        pc.putc(32);
-                        pc.putc(8);
+                        if(line_length > 0)  //delete one char on screen
+                        {
+                            pc.putc(8);
+                            pc.putc(32);
+                            pc.putc(8);
+                        }
                         
                         if(line_length <= 3 && line_length>=1)   
                         {
@@ -120,7 +123,7 @@
                         if(line_length > 0)
                             line_length --;
                     }
-                    else        //other character is pressed, record that in line buffer
+                    else if(recv == '.' || recv == '-' || (recv >= '0' && recv <= '9') )   //the line buffer accepts -, ., 0-9 only
                     {
                         pc.putc(recv);
                         line_length ++;