X-Git-Url: http://wien.tomnetworks.com/gitweb/?p=hwmod.git;a=blobdiff_plain;f=src%2Fgen_pkg.vhd;h=11a40b1339e1dd543712af78f2486a0eb3ce8b18;hp=d97b94350ac47ac3d0dc1492805ea44497df84cb;hb=84b6ef65190dbb25538b87572d2b2312ee447107;hpb=7a3f1551c488889bd3cdf070448c114a5c80e1a9

diff --git a/src/gen_pkg.vhd b/src/gen_pkg.vhd
index d97b943..11a40b1 100644
--- 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;