display: fuer istate wird nun auch ein enum verwendet

[hwmod.git] / src / gen_pkg.vhd

diff --git a/src/gen_pkg.vhd b/src/gen_pkg.vhd
index d97b94350ac47ac3d0dc1492805ea44497df84cb..11a40b1339e1dd543712af78f2486a0eb3ce8b18 100644 (file)
--- a/src/gen_pkg.vhd
+++ b/src/gen_pkg.vhd
@@ -29,40 +29,43 @@ package gen_pkg is
 
        procedure icwait(signal clk_i : IN std_logic; cycles: natural);
 
+       function ascii2sc (x : hbyte) return hbyte;
+       function valid_char (x : hbyte) return boolean;
+
        -- http://www.marjorie.de/ps2/scancode-set2.htm
-       constant SC_KP_0 : std_logic_vector(7 downto 0) := x"70";
-       constant SC_KP_1 : std_logic_vector(7 downto 0) := x"69";
-       constant SC_KP_2 : std_logic_vector(7 downto 0) := x"72";
-       constant SC_KP_3 : std_logic_vector(7 downto 0) := x"7a";
-       constant SC_KP_4 : std_logic_vector(7 downto 0) := x"6b";
-       constant SC_KP_5 : std_logic_vector(7 downto 0) := x"73";
-       constant SC_KP_6 : std_logic_vector(7 downto 0) := x"74";
-       constant SC_KP_7 : std_logic_vector(7 downto 0) := x"6c";
-       constant SC_KP_8 : std_logic_vector(7 downto 0) := x"75";
-       constant SC_KP_9 : std_logic_vector(7 downto 0) := x"7d";
+       constant SC_KP_0 : hbyte := x"70";
+       constant SC_KP_1 : hbyte := x"69";
+       constant SC_KP_2 : hbyte := x"72";
+       constant SC_KP_3 : hbyte := x"7a";
+       constant SC_KP_4 : hbyte := x"6b";
+       constant SC_KP_5 : hbyte := x"73";
+       constant SC_KP_6 : hbyte := x"74";
+       constant SC_KP_7 : hbyte := x"6c";
+       constant SC_KP_8 : hbyte := x"75";
+       constant SC_KP_9 : hbyte := x"7d";
 
-       constant SC_0 : std_logic_vector(7 downto 0) := x"45";
-       constant SC_1 : std_logic_vector(7 downto 0) := x"16";
-       constant SC_2 : std_logic_vector(7 downto 0) := x"1e";
-       constant SC_3 : std_logic_vector(7 downto 0) := x"26";
-       constant SC_4 : std_logic_vector(7 downto 0) := x"25";
-       constant SC_5 : std_logic_vector(7 downto 0) := x"2e";
-       constant SC_6 : std_logic_vector(7 downto 0) := x"36";
-       constant SC_7 : std_logic_vector(7 downto 0) := x"3d";
-       constant SC_8 : std_logic_vector(7 downto 0) := x"3e";
-       constant SC_9 : std_logic_vector(7 downto 0) := x"46";
+       constant SC_0 : hbyte := x"45";
+       constant SC_1 : hbyte := x"16";
+       constant SC_2 : hbyte := x"1e";
+       constant SC_3 : hbyte := x"26";
+       constant SC_4 : hbyte := x"25";
+       constant SC_5 : hbyte := x"2e";
+       constant SC_6 : hbyte := x"36";
+       constant SC_7 : hbyte := x"3d";
+       constant SC_8 : hbyte := x"3e";
+       constant SC_9 : hbyte := x"46";
 
-       constant SC_KP_PLUS : std_logic_vector(7 downto 0) := x"79";
-       constant SC_KP_MINUS : std_logic_vector(7 downto 0) := x"7b";
-       constant SC_KP_MUL : std_logic_vector(7 downto 0) := x"7c";
-       constant SC_KP_DIV : std_logic_vector(7 downto 0) := x"4a"; -- inkl. 0xe0!
+       constant SC_KP_PLUS : hbyte := x"79";
+       constant SC_KP_MINUS : hbyte := x"7b";
+       constant SC_KP_MUL : hbyte := x"7c";
+       constant SC_KP_DIV : hbyte := x"4a"; -- inkl. 0xe0!
 
        -- fuer deutsches layout, alle anderen zeichen sind unguenstig belegt
-       constant SC_PLUS : std_logic_vector(7 downto 0) := x"5b";
+       constant SC_PLUS : hbyte := x"5b";
 
-       constant SC_ENTER : std_logic_vector(7 downto 0) := x"5a";
-       constant SC_BKSP : std_logic_vector(7 downto 0) := x"66";
-       constant SC_SPACE : std_logic_vector(7 downto 0) := x"29";
+       constant SC_ENTER : hbyte := x"5a";
+       constant SC_BKSP : hbyte := x"66";
+       constant SC_SPACE : hbyte := x"29";
 end package gen_pkg;
 
 package body gen_pkg is
@@ -72,4 +75,46 @@ package body gen_pkg is
                        wait until clk_i= '0' and clk_i'event;
                end loop;
        end;
+
+       function ascii2sc (x : hbyte) return hbyte is
+               variable y : hbyte;
+       begin
+               case x is
+                       when x"30" => y := SC_KP_0;
+                       when x"31" => y := SC_KP_1;
+                       when x"32" => y := SC_KP_2;
+                       when x"33" => y := SC_KP_3;
+                       when x"34" => y := SC_KP_4;
+                       when x"35" => y := SC_KP_5;
+                       when x"36" => y := SC_KP_6;
+                       when x"37" => y := SC_KP_7;
+                       when x"38" => y := SC_KP_8;
+                       when x"39" => y := SC_KP_9;
+                       when x"2b" => y := SC_KP_PLUS;
+                       when x"2d" => y := SC_KP_MINUS;
+                       when x"2a" => y := SC_KP_MUL;
+                       when x"2f" => y := SC_KP_DIV;
+                       when x"20" => y := SC_SPACE;
+                       when x"1c" => y := SC_ENTER;
+                       when x"0e" => y := SC_BKSP;
+                       when others => y := x"41";
+               end case;
+               return y;
+       end function;
+
+       function valid_char (x : hbyte) return boolean is
+               variable y : boolean;
+       begin
+               case x is
+                       when SC_KP_0 | SC_KP_1 | SC_KP_2 | SC_KP_3 |
+                               SC_KP_4 | SC_KP_5 | SC_KP_6 | SC_KP_7 |
+                               SC_KP_8 | SC_KP_9 | SC_KP_PLUS |
+                               SC_KP_MINUS | SC_KP_MUL |
+                               SC_KP_DIV | SC_SPACE |
+                               SC_BKSP | SC_ENTER =>
+                                       y := true;
+                       when others => y := false;
+               end case;
+               return y;
+       end function;
 end package body gen_pkg;