src/display.vhd

   1 library ieee;
   2 use ieee.std_logic_1164.all;
   3 use ieee.numeric_std.all;
   4 use work.gen_pkg.all;
   5 use work.textmode_vga_component_pkg.all;
   6 use work.textmode_vga_pkg.all;
   7 use work.textmode_vga_platform_dependent_pkg.all;
   8
   9 entity display is
  10         port (
  11                 sys_clk : in std_logic;
  12                 sys_res_n : in std_logic;
  13                 -- History
  14                 d_new_eingabe : in std_logic;
  15                 d_new_result : in std_logic;
  16                 d_new_bs : in std_logic;
  17                 d_zeile : out hzeile;
  18                 d_spalte : out hspalte;
  19                 d_get : out std_logic;
  20                 d_done : in std_logic;
  21                 d_char : in hbyte;
  22                 -- VGA
  23                 command : out std_logic_vector(7 downto 0);
  24                 command_data : out std_logic_vector(31 downto 0);
  25                 free : in std_logic
  26         );
  27 end entity display;
  28
  29 architecture beh of display is
  30         type DISPLAY_STATE is (SIDLE, S_NEW_BS, S_BACK, S_BLANK, S_NEW_RESULT,
  31                 S_ZEILEUP, S_NEW_INPUT, S_COUNTUP, S_GETCH, S_CR1, S_NL1, S_PUTCH1,
  32                 S_PUTCH2, S_WAIT, S_NOP1, S_READ_RESULT_0, S_READ_RESULT_1,
  33                 S_READ_RESULT_2, S_INIT, S_PS1_0, S_PS1_1, S_PS1_2, S_PS1_3, S_PS1_4,
  34                 S_PS1_5);
  35         signal state_int, state_next : DISPLAY_STATE;
  36         signal d_zeile_int, d_zeile_next : hzeile;
  37         signal d_spalte_int, d_spalte_next : hspalte;
  38         signal d_get_int, d_get_next : std_logic;
  39         signal command_int, command_next : std_logic_vector(7 downto 0);
  40         signal command_data_int, command_data_next : std_logic_vector(31 downto 0);
  41         signal istate_next, istate_int : signed(4 downto 0);
  42 begin
  43         d_zeile <= d_zeile_int;
  44         d_spalte <= d_spalte_int;
  45         d_get <= d_get_int;
  46         command <= command_int;
  47         command_data <= command_data_int;
  48
  49         process(sys_clk, sys_res_n)
  50         begin
  51                 if sys_res_n = '0' then
  52                         -- internal
  53                         state_int <= S_INIT;
  54                         istate_int <= (others => '0');
  55                         -- out
  56                         d_zeile_int <= (others => '0');
  57                         d_spalte_int <= (others => '0');
  58                         d_get_int <= '0';
  59                         command_int <= COMMAND_NOP;
  60                         command_data_int <= (others => '0');
  61                 elsif rising_edge(sys_clk) then
  62                         -- internal
  63                         state_int <= state_next;
  64                         istate_int <= istate_next;
  65                         -- out
  66                         d_zeile_int <= d_zeile_next;
  67                         d_spalte_int <= d_spalte_next;
  68                         d_get_int <= d_get_next;
  69                         command_int <= command_next;
  70                         command_data_int <= command_data_next;
  71                 end if;
  72         end process;
  73
  74         -- next state
  75         process(state_int, d_new_result, d_new_eingabe, d_new_bs, d_done, free,
  76                 d_spalte_int, d_char, istate_int)
  77         begin
  78                 state_next <= state_int;
  79                 istate_next <= istate_int;
  80
  81                 case state_int is
  82                         when S_INIT =>
  83                                 state_next <= S_PS1_0;
  84
  85                         when S_PS1_0 =>
  86                                 istate_next <= b"01001";
  87                                 state_next <= S_WAIT;
  88                         when S_PS1_1 =>
  89                                 istate_next <= b"01010";
  90                                 state_next <= S_WAIT;
  91                         when S_PS1_2 =>
  92                                 istate_next <= b"01011";
  93                                 state_next <= S_WAIT;
  94                         when S_PS1_3 =>
  95                                 istate_next <= b"01100";
  96                                 state_next <= S_WAIT;
  97                         when S_PS1_4 =>
  98                                 istate_next <= b"01101";
  99                                 state_next <= S_WAIT;
 100                         when S_PS1_5 =>
 101                                 istate_next <= b"00111";
 102                                 state_next <= S_WAIT;
 103
 104                         when SIDLE =>
 105                                 istate_next <= b"00111"; -- default: immer wieder ins SIDLE;
 106                                 if d_new_bs = '1' then
 107                                         state_next <= S_NEW_BS;
 108                                 elsif d_new_eingabe = '1' then
 109                                         state_next <= S_NEW_INPUT;
 110                                 end if;
 111                                 if d_new_result = '1' then
 112                                         state_next <= S_NEW_RESULT;
 113                                 end if;
 114
 115                         when S_NEW_RESULT =>
 116                                 state_next <= S_ZEILEUP;
 117                         when S_NEW_INPUT =>
 118                                 state_next <= S_COUNTUP;
 119
 120                         when S_NEW_BS =>
 121                                 state_next <= S_BACK;
 122                         when S_BACK =>
 123                                 if free = '0' then
 124                                         state_next <= S_WAIT;
 125                                         case istate_int is
 126                                                 when b"00111" => istate_next <= b"00001"; -- => danach S_BLANK und wieder hierher
 127                                                 when others => istate_next <= b"00111"; -- => danach SIDLE
 128                                         end case;
 129                                 end if;
 130                         when S_BLANK =>
 131                                 if free = '0' then
 132                                         state_next <= S_WAIT;
 133                                         istate_next <= b"00010"; -- => danach S_BACK
 134                                 end if;
 135
 136                         when S_ZEILEUP =>
 137                                 case istate_int is
 138                                         when b"00011" =>
 139                                                 state_next <= S_WAIT;
 140                                                 istate_next <= b"01000"; -- => danach S_PS1
 141                                         when others => state_next <= S_CR1;
 142                                 end case;
 143
 144                         when S_CR1 =>
 145                                 if free = '0' then
 146                                         state_next <= S_WAIT;
 147                                         case istate_int is
 148                                                 when b"00110" => istate_next <= b"00101"; -- => danach S_NL1, S_ZEILEUP, S_PS1, SIDLE
 149                                                 when others => istate_next <= b"00000"; -- => danach S_NL1 und S_COUNTUP
 150                                         end case;
 151                                 end if;
 152                         when S_NL1 =>
 153                                 if free = '0' then
 154                                         state_next <= S_WAIT;
 155                                         case istate_int is
 156                                                 when b"00101" => istate_next <= b"00011"; -- => danach S_ZEILEUP, PS1
 157                                                 when others => istate_next <= b"10000"; -- => danach S_READ_RESULT_0
 158                                         end case;
 159                                 end if;
 160
 161                         when S_READ_RESULT_0 =>
 162                                 istate_next <= b"10001";
 163                                 state_next <= S_WAIT;
 164                         when S_READ_RESULT_1 =>
 165                                 istate_next <= b"10010";
 166                                 state_next <= S_WAIT;
 167                         when S_READ_RESULT_2 =>
 168                                 if unsigned(d_spalte_int) /= 70 then
 169                                         state_next <= S_COUNTUP;
 170                                         istate_next <= b"10010"; -- => wieder nach S_READ_RESULT_2
 171                                 else
 172                                         state_next <= S_WAIT;
 173                                         istate_next <= b"00110"; -- => danach S_CR1 und d_spalte_next clearen und d_zeile_next inkrementieren
 174                                 end if;
 175
 176                         when S_COUNTUP =>
 177                                 state_next <= S_GETCH;
 178                         when S_GETCH =>
 179                                 if free = '1' and d_done = '1' and d_new_result = '0' and d_new_eingabe = '0' then
 180                                         state_next <= S_PUTCH1;
 181                                 end if;
 182                         when S_PUTCH1 =>
 183                                 state_next <= S_PUTCH2;
 184                         when S_PUTCH2 =>
 185                                 if free = '0' or (free = '1' and d_char = x"00") then
 186                                         state_next <= S_WAIT;
 187                                 end if;
 188                         when S_WAIT =>
 189                                 if free = '1' and d_done = '0' then
 190                                         state_next <= S_NOP1;
 191                                 end if;
 192                         when S_NOP1 =>
 193                                 if free = '1' then
 194                                         case istate_int is
 195                                                 when b"00000" => state_next <= S_NL1;
 196                                                 when b"00001" => state_next <= S_BLANK;
 197                                                 when b"00010" => state_next <= S_BACK;
 198                                                 when b"00011" => state_next <= S_ZEILEUP;
 199                                                 when b"00110" => state_next <= S_CR1;
 200                                                 when b"00101" => state_next <= S_NL1;
 201
 202                                                 when b"10000" => state_next <= S_READ_RESULT_0;
 203                                                 when b"10001" => state_next <= S_READ_RESULT_1;
 204                                                 when b"10010" => state_next <= S_READ_RESULT_2;
 205
 206                                                 when b"01000" => state_next <= S_PS1_0;
 207                                                 when b"01001" => state_next <= S_PS1_1;
 208                                                 when b"01010" => state_next <= S_PS1_2;
 209                                                 when b"01011" => state_next <= S_PS1_3;
 210                                                 when b"01100" => state_next <= S_PS1_4;
 211                                                 when b"01101" => state_next <= S_PS1_5;
 212                                                 when others => state_next <= SIDLE;
 213                                         end case;
 214                                 end if;
 215                 end case;
 216         end process;
 217
 218         -- out
 219         process(state_int, d_zeile_int, d_spalte_int, d_get_int, command_int,
 220                 command_data_int, d_char)
 221         begin
 222                 d_zeile_next <= d_zeile_int;
 223                 d_spalte_next <= d_spalte_int;
 224                 d_get_next <= '0';
 225                 command_next <= command_int;
 226                 command_data_next <= command_data_int;
 227
 228                 case state_int is
 229                         when S_INIT => null;
 230
 231                         -- TODO: coole farben
 232                         when S_PS1_0 =>
 233                                 command_next <= COMMAND_SET_CHAR;
 234                                 command_data_next <= x"ffffff" & x"28"; -- '('
 235                         when S_PS1_1 =>
 236                                 command_next <= COMMAND_SET_CHAR;
 237                                 -- d_zeile/2, zehnerstelle
 238                                 command_data_next <= x"ffffff" & x"78"; -- 'x'
 239                         when S_PS1_2 =>
 240                                 command_next <= COMMAND_SET_CHAR;
 241                                 -- d_zeile/2, einerstelle
 242                                 command_data_next <= x"ffffff" & x"79"; -- 'y'
 243                         when S_PS1_3 =>
 244                                 command_next <= COMMAND_SET_CHAR;
 245                                 command_data_next <= x"ffffff" & x"29"; -- ')'
 246                         when S_PS1_4 =>
 247                                 command_next <= COMMAND_SET_CHAR;
 248                                 command_data_next <= x"ffffff" & x"24"; -- '$'
 249                         when S_PS1_5 =>
 250                                 command_next <= COMMAND_SET_CHAR;
 251                                 command_data_next <= x"ffffff" & x"20"; -- ' '
 252
 253                         when SIDLE => null;
 254                         when S_NEW_RESULT => null;
 255                         when S_NEW_INPUT => null;
 256
 257                         when S_NEW_BS =>
 258                                 -- underflow check schon im history modul
 259                                 d_spalte_next <= std_logic_vector(unsigned(d_spalte_int) - 1);
 260                         when S_BACK =>
 261                                 -- einen schritt zurueck, +6 wegen $PS1
 262                                 command_next <= COMMAND_SET_CURSOR_COLUMN;
 263                                 command_data_next <= x"ffffff" & '0' & std_logic_vector(unsigned(d_spalte_int) + 6);
 264                         when S_BLANK =>
 265                                 command_next <= COMMAND_SET_CHAR;
 266                                 command_data_next <= x"ffffff" & x"20"; -- white space
 267
 268                         when S_ZEILEUP =>
 269                                 d_spalte_next <= (others => '0');
 270                                 case d_zeile_int is
 271                                         -- 49 * 2 + 1
 272                                         when "1100010" => d_zeile_next <= (others => '0');
 273                                         when others => d_zeile_next <= std_logic_vector(unsigned(d_zeile_int) + 1);
 274                                 end case;
 275
 276                         when S_CR1 =>
 277                                 command_next <= COMMAND_SET_CHAR;
 278                                 command_data_next <= x"ffffff" & x"0d"; -- carrige return
 279                         when S_NL1 =>
 280                                 command_next <= COMMAND_SET_CHAR;
 281                                 command_data_next <= x"ffffff" & x"0a"; -- newline
 282
 283                         -- TODO: coole farben
 284                         when S_READ_RESULT_0 =>
 285                                 command_next <= COMMAND_SET_CHAR;
 286                                 command_data_next <= x"ffffff" & x"3e"; -- '>'
 287                         when S_READ_RESULT_1 =>
 288                                 command_next <= COMMAND_SET_CHAR;
 289                                 command_data_next <= x"ffffff" & x"20"; -- ' '
 290                         when S_READ_RESULT_2 => null;
 291
 292                         when S_COUNTUP =>
 293                                 d_get_next <= '1';
 294                                 d_spalte_next <= std_logic_vector(unsigned(d_spalte_int) + 1);
 295                         when S_GETCH =>
 296                                 d_get_next <= '1';
 297                         when S_PUTCH1 =>
 298                                 if d_char /= x"00" then
 299                                         command_next <= COMMAND_SET_CHAR;
 300                                         command_data_next <= x"ffffff" & std_logic_vector(d_char);
 301                                 end if;
 302                         when S_PUTCH2 => null;
 303                         when S_WAIT | S_NOP1 =>
 304                                 command_next <= COMMAND_NOP;
 305                                 command_data_next <= x"00000000";
 306                 end case;
 307         end process;
 308 end architecture beh;