X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=src%2Fgen_pkg.vhd;h=dfe664c1fb05b077a27ef2e4ae84de0cf9bb117c;hb=b42b2b9d669e1d12db43c70704b4657901d1ab02;hp=1fd0404bb2b1a07c64b083f73499b1cddb1eb068;hpb=584190162f6e4df9bbedb74cde4c1d5d8670feb8;p=hwmod.git

diff --git a/src/gen_pkg.vhd b/src/gen_pkg.vhd
index 1fd0404..dfe664c 100644
--- a/src/gen_pkg.vhd
+++ b/src/gen_pkg.vhd
@@ -14,41 +14,113 @@ package gen_pkg is
 
 	constant CBITS : integer := 32;
 	subtype csigned is signed((CBITS-1) downto 0);
-	subtype divinteger is integer range -33 to 33;
+	subtype divinteger is unsigned(4 downto 0);
 	-- integer ist 32bit (31bit + sign)
 	subtype cinteger is integer;
 
-	-- vorerst: 2 * 71
-	constant H_RAM_SIZE : integer := 142;
-	-- danach: 50 * 71 * 2 = 7100
-	-- constant H_RAM_SIZE : integer := 7100;
-	constant H_RAM_WIDTH : integer := log2c(H_RAM_SIZE);
+
+	constant HSPALTE_MAX : integer := 71;
 	subtype hspalte is std_logic_vector(6 downto 0);
-	subtype hzeile is std_logic_vector(4 downto 0);
+
+	constant HZEILE_MAX : integer := 100;
+	subtype hzeile is std_logic_vector(6 downto 0);
+
+	-- 50 zeilen * 71 zeichen * 2 (berechnung + ergebnis) = 7100 bytes
+	constant H_RAM_SIZE : integer := HZEILE_MAX * HSPALTE_MAX;
+	constant H_RAM_WIDTH : integer := log2c(H_RAM_SIZE);
+
 	subtype hbyte is std_logic_vector(7 downto 0);
-	subtype hstring is string(1 to 71);
-	subtype hstr_int is integer range 0 to 72;
+	subtype hstring is string(1 to HSPALTE_MAX+1);
+	subtype hstr_int is integer range 0 to HSPALTE_MAX+1;
 
-	function find_msb(a : csigned) return divinteger;
 	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 : 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 : 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 : 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 : hbyte := x"5b";
+
+	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
-	function find_msb(a : csigned) return divinteger is
-		variable r : divinteger := 0;
-	begin
-		for i in (CBITS-1) downto 0 loop
-			exit when a(i) = '1';
-			r := r+1;
-		end loop;
-		return (CBITS - r);
-	end function find_msb;
-
 	procedure icwait(signal clk_i : IN std_logic; cycles: Natural) is
 	begin
 		for i in 1 to cycles loop
 			wait until clk_i= '0' and clk_i'event;
 		end loop;
 	end;
-end package body gen_pkg;
 
+	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;