allgemein: konstanten verwenden

[hwmod.git] / src / gen_pkg.vhd

diff --git a/src/gen_pkg.vhd b/src/gen_pkg.vhd
index e5c692e3f1ca74413eb89590fddcd87fce2e850c..dfe664c1fb05b077a27ef2e4ae84de0cf9bb117c 100644 (file)
--- a/src/gen_pkg.vhd
+++ b/src/gen_pkg.vhd
@@ -1,6 +1,7 @@
 library ieee;
 use ieee.std_logic_1164.all;
 use ieee.numeric_std.all;
+use work.math_pkg.all;
 
 package gen_pkg is
        subtype alu_ops is std_logic_vector(2 downto 0);
@@ -13,34 +14,113 @@ package gen_pkg is
 
        constant CBITS : integer := 32;
        subtype csigned is signed((CBITS-1) downto 0);
-       --TODO: bei CBITS-1 gibts einen overflow :/
-       subtype cinteger is integer range -(2**(CBITS-2)) to ((2**(CBITS-2))-1);
+       subtype divinteger is unsigned(4 downto 0);
+       -- integer ist 32bit (31bit + sign)
+       subtype cinteger is integer;
 
+
+       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 hstring is string(1 to HSPALTE_MAX+1);
+       subtype hstr_int is integer range 0 to HSPALTE_MAX+1;
+
+       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!
 
-       function find_msb(a : csigned) return natural;
-       procedure icwait(signal clk_i : IN std_logic; cycles: Natural);
+       -- 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 natural is
-               variable r : natural := 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;