-- integer ist 32bit (31bit + sign)
subtype cinteger is integer;
- -- 50 zeilen * 71 zeichen * 2 (berechnung + ergebnis) = 7100 bytes
- 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);
+
+ 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 72);
- 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 : std_logic_vector) return std_logic_vector;
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_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_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_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 : 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
- -- http://www.velocityreviews.com/forums/showpost.php?p=137148&postcount=5
- function find_msb(a : std_logic_vector) return std_logic_vector is
- function bits_to_fit(n : positive) return natural is
- variable nn, bits : natural := 0;
- begin
- nn := n;
- while nn > 0 loop
- bits := bits + 1;
- nn := nn/2;
- end loop;
- return bits;
- end;
-
- function or_all(p : std_logic_vector) return std_logic is
- variable r : std_logic;
- begin
- r := '0';
- for i in p'range loop
- r := r or p(i);
- end loop;
- return r;
- end;
-
- constant wN : positive := bits_to_fit(a'length - 1);
- constant wP : positive := 2 ** wN;
- variable pv : std_logic_vector(wP-1 downto 0);
- variable n : std_logic_vector(wN downto 1);
- begin
- if a'length <= 2 then
- n(n'right) := a(a'left);
- else
- pv(a'length-1 downto 0) := a;
- if or_all(pv(wP-1 downto wP/2)) = '1' then
- n := '1' & find_msb((pv(wP-1 downto wP/2)));
- else
- n := '0' & find_msb((pv(wP/2-1 downto 0)));
- end if;
- end if;
- return n;
- end function find_msb;
- -- -- alternativ: eleganter, braucht aber mehr logic cells
- -- for i in (CBITS-1) downto 0 loop
- -- exit when a(i) = '1';
- -- r := r+1;
- -- end loop;
- -- return (CBITS - r);
-
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;
projects / hwmod.git / blobdiff