Improve exampls to handle Space and both Enter keys

Add correct handling of Caps and Num Lock when used with shift

Author: techpaul

examples/KeyToLCD/KeyToLCD.ino

@@ -106,49 +106,29 @@
 
 /* Keyboard constants  Change to suit your Arduino
    define pins used for data and clock from keyboard */
-//#define DATAPIN 4
-//#define IRQPIN  3
-#if defined(ARDUINO_ARCH_AVR)
-#define DATAPIN 19
-#define IRQPIN  18
-#elif defined(ARDUINO_ARCH_SAM)
-#define DATAPIN 14
-#define IRQPIN  15
-#endif
+#define DATAPIN 4
+#define IRQPIN  3
 
-/* LCD pins definitions to match your LCD */
-#if 0
+/* LCD pins definitions to match your LCD 4 bit mode */
 #define RS  12
 #define ENA 11
-//#define RW  0
-#define D7   7
+#define RW  10
+#define D7   9
 #define D6   8
-#define D5   9
-#define D4  10
-#endif
-#if defined(ARDUINO_ARCH_AVR)
-#define RS  33
-#define ENA 31
-#define RW  35
-#define D7  29
-#define D6  28
-#define D5  27
-#define D4  26
-#elif defined(ARDUINO_ARCH_SAM)
-#define RS  38
-#define ENA 40
-#define RW  41
-#define D7  47
-#define D6  46
-#define D5  49
-#define D4  48
-#endif
+#define D5   7
+#define D4   6
 
 /* LCD Constants to match your display */
 /* Columns in display */
 #define MAX_COL 16
 /* Rows in display */
-#define MAX_ROW 2
+#define MAX_ROW  2
+
+/* LCD Constants to match your display */
+/* Columns in display */
+#define MAX_COL 20
+/* Rows in display */
+#define MAX_ROW 4
 
 /* current cursor position */
 signed char cols = 0;
@@ -158,10 +138,11 @@ signed char rows = 0;
 /* Key codes and strings for keys producing a string */
 /* three arrays in same order ( keycode, string to display, length of string ) */
 #if defined(ARDUINO_ARCH_AVR)
-const uint8_t codes[] PROGMEM = { PS2_KEY_TAB, PS2_KEY_ESC, PS2_KEY_DELETE,
+const uint8_t codes[] PROGMEM = { PS2_KEY_SPACE, PS2_KEY_TAB, PS2_KEY_ESC, PS2_KEY_DELETE,
                                    PS2_KEY_F1, PS2_KEY_F2, PS2_KEY_F3, PS2_KEY_F4,
                                    PS2_KEY_F5, PS2_KEY_F6, PS2_KEY_F7, PS2_KEY_F8,
                                    PS2_KEY_F9, PS2_KEY_F10, PS2_KEY_F11, PS2_KEY_F12 };
+const char spacestr[] PROGMEM  = " ";
 const char tabstr[] PROGMEM  = "[Tab]";
 const char escstr[] PROGMEM  = "[ESC]";
 const char delstr[] PROGMEM  = "[Del]";
@@ -178,20 +159,25 @@ const char f10str[] PROGMEM  = "[F10]";
 const char f11str[] PROGMEM  = "[F11]";
 const char f12str[] PROGMEM  = "[F12]";
 
-const int8_t sizes[] PROGMEM = { 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5 };
+// Due to AVR Harvard architecture array of string pointers to actual strings
 const char *const keys[] PROGMEM =  {
-                                tabstr, escstr, delstr, f1str, f2str, f3str,
-                                f4str, f5str, f6str, f7str, f8str,
+                                spacestr, tabstr, escstr, delstr, f1str, f2str,
+                                f3str, f4str, f5str, f6str, f7str, f8str,
                                 f9str, f10str, f11str, f12str };
+const int8_t sizes[] PROGMEM = { 1, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5 };
 char buffer[ 8 ];
+
 #elif defined(ARDUINO_ARCH_SAM)
-const uint8_t codes[] = { PS2_KEY_TAB, PS2_KEY_ESC, PS2_KEY_DELETE, PS2_KEY_F1, PS2_KEY_F2,
-                          PS2_KEY_F3, PS2_KEY_F4, PS2_KEY_F5, PS2_KEY_F6, PS2_KEY_F7,
-                          PS2_KEY_F8, PS2_KEY_F9, PS2_KEY_F10, PS2_KEY_F11, PS2_KEY_F12 };
-const char *const keys[]  =  { "[Tab]", "[ESC]", "[Del]", "[F1]", "[F2]", "[F3]",
+const uint8_t codes[] = { PS2_KEY_SPACE, PS2_KEY_TAB, PS2_KEY_ESC,
+                          PS2_KEY_DELETE, PS2_KEY_F1, PS2_KEY_F2, PS2_KEY_F3,
+                          PS2_KEY_F4, PS2_KEY_F5, PS2_KEY_F6, PS2_KEY_F7,
+                          PS2_KEY_F8, PS2_KEY_F9, PS2_KEY_F10, PS2_KEY_F11,
+                          PS2_KEY_F12 };
+const char *const keys[]  =  { " ", "[Tab]", "[ESC]", "[Del]", "[F1]", "[F2]", "[F3]",
                                "[F4]", "[F5]", "[F6]", "[F7]", "[F8]",
                                "[F9]", "[F10]", "[F11]", "[F12]" };
-const int8_t sizes[]  = { 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5 };
+const int8_t sizes[]  = { 1, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5 };
+
 #else
   #error “This library only supports boards with an AVR or SAM processor.”
 #endif

src/PS2KeyMap.cpp

@@ -296,9 +296,12 @@ else
   // Remainder convert printable to US-ASCII
   if( !( code & PS2_FUNCTION ) )
     {  // Some codes are straight return values We deal with ones that need work
-       // When A-Z not shifted create lower case a - z
+    // When A-Z not shifted create lower case a - z
     if( temp >= PS2_KEY_A && temp <= PS2_KEY_Z )
       {
+      // Deal with Caps Lock by inverting PS2_SHIFT and remove caps lock
+      if( ( code & PS2_CAPS ) )
+        code ^= ( PS2_SHIFT + PS2_CAPS );
       if( !( code & PS2_SHIFT ) )
         code |= 0x20;
       // When shifted pass through code as received as the codes are A - Z