-- History
d_new_eingabe : in std_logic;
d_new_result : in std_logic;
+ d_new_bs : in std_logic;
d_zeile : out hzeile;
d_spalte : out hspalte;
d_get : out std_logic;
end entity display;
architecture beh of display is
- type DISPLAY_STATE is (SIDLE, S_NEW_RESULT, S_NEW_INPUT, S_COUNTUP, S_GETCH,
- S_PUTCH, S_WAIT, S_NOP1);
+ type DISPLAY_STATE is (SIDLE, S_NEW_BS, S_BACK, S_BLANK, S_NEW_RESULT,
+ S_ZEILEUP, S_NEW_INPUT, S_COUNTUP, S_GETCH, S_CR1, S_NL1, S_PUTCH1,
+ S_PUTCH2, S_WAIT, S_NOP1, S_READ_RESULT_0, S_READ_RESULT_1,
+ S_READ_RESULT_2, S_INIT, S_PS1_0, S_PS1_1, S_PS1_2, S_PS1_3, S_PS1_4,
+ S_PS1_5);
signal state_int, state_next : DISPLAY_STATE;
signal d_zeile_int, d_zeile_next : hzeile;
signal d_spalte_int, d_spalte_next : hspalte;
signal d_get_int, d_get_next : std_logic;
signal command_int, command_next : std_logic_vector(7 downto 0);
signal command_data_int, command_data_next : std_logic_vector(31 downto 0);
+ signal istate_next, istate_int : signed(4 downto 0);
begin
d_zeile <= d_zeile_int;
d_spalte <= d_spalte_int;
begin
if sys_res_n = '0' then
-- internal
- state_int <= SIDLE;
+ state_int <= S_INIT;
+ istate_int <= (others => '0');
-- out
d_zeile_int <= (others => '0');
d_spalte_int <= (others => '0');
elsif rising_edge(sys_clk) then
-- internal
state_int <= state_next;
+ istate_int <= istate_next;
-- out
d_zeile_int <= d_zeile_next;
d_spalte_int <= d_spalte_next;
end process;
-- next state
- process(state_int, d_new_result, d_new_eingabe, d_done, free, d_spalte_int,
- d_char)
+ process(state_int, d_new_result, d_new_eingabe, d_new_bs, d_done, free,
+ d_spalte_int, d_char, istate_int)
begin
state_next <= state_int;
+ istate_next <= istate_int;
case state_int is
+ when S_INIT =>
+ state_next <= S_PS1_0;
+
+ when S_PS1_0 =>
+ istate_next <= b"01001";
+ state_next <= S_WAIT;
+ when S_PS1_1 =>
+ istate_next <= b"01010";
+ state_next <= S_WAIT;
+ when S_PS1_2 =>
+ istate_next <= b"01011";
+ state_next <= S_WAIT;
+ when S_PS1_3 =>
+ istate_next <= b"01100";
+ state_next <= S_WAIT;
+ when S_PS1_4 =>
+ istate_next <= b"01101";
+ state_next <= S_WAIT;
+ when S_PS1_5 =>
+ istate_next <= b"00111";
+ state_next <= S_WAIT;
+
when SIDLE =>
- if d_new_eingabe = '1' then
+ istate_next <= b"00111"; -- default: immer wieder ins SIDLE;
+ if d_new_bs = '1' then
+ state_next <= S_NEW_BS;
+ elsif d_new_eingabe = '1' then
state_next <= S_NEW_INPUT;
end if;
if d_new_result = '1' then
state_next <= S_NEW_RESULT;
end if;
- when S_NEW_RESULT | S_NEW_INPUT =>
+
+ when S_NEW_RESULT =>
+ state_next <= S_ZEILEUP;
+ when S_NEW_INPUT =>
state_next <= S_COUNTUP;
+
+ when S_NEW_BS =>
+ state_next <= S_BACK;
+ when S_BACK =>
+ if free = '0' then
+ state_next <= S_WAIT;
+ case istate_int is
+ when b"00111" => istate_next <= b"00001"; -- => danach S_BLANK und wieder hierher
+ when others => istate_next <= b"00111"; -- => danach SIDLE
+ end case;
+ end if;
+ when S_BLANK =>
+ if free = '0' then
+ state_next <= S_WAIT;
+ istate_next <= b"00010"; -- => danach S_BACK
+ end if;
+
+ when S_ZEILEUP =>
+ case istate_int is
+ when b"00011" =>
+ state_next <= S_WAIT;
+ istate_next <= b"01000"; -- => danach S_PS1
+ when others => state_next <= S_CR1;
+ end case;
+
+ when S_CR1 =>
+ if free = '0' then
+ state_next <= S_WAIT;
+ case istate_int is
+ when b"00110" => istate_next <= b"00101"; -- => danach S_NL1, S_ZEILEUP, S_PS1, SIDLE
+ when others => istate_next <= b"00000"; -- => danach S_NL1 und S_COUNTUP
+ end case;
+ end if;
+ when S_NL1 =>
+ if free = '0' then
+ state_next <= S_WAIT;
+ case istate_int is
+ when b"00101" => istate_next <= b"00011"; -- => danach S_ZEILEUP, PS1
+ when others => istate_next <= b"10000"; -- => danach S_READ_RESULT_0
+ end case;
+ end if;
+
+ when S_READ_RESULT_0 =>
+ istate_next <= b"10001";
+ state_next <= S_WAIT;
+ when S_READ_RESULT_1 =>
+ istate_next <= b"10010";
+ state_next <= S_WAIT;
+ when S_READ_RESULT_2 =>
+ if unsigned(d_spalte_int) /= 70 then
+ state_next <= S_COUNTUP;
+ istate_next <= b"10010"; -- => wieder nach S_READ_RESULT_2
+ else
+ state_next <= S_WAIT;
+ istate_next <= b"00110"; -- => danach S_CR1 und d_spalte_next clearen und d_zeile_next inkrementieren
+ end if;
+
when S_COUNTUP =>
state_next <= S_GETCH;
when S_GETCH =>
- if free = '1' and d_done = '1' then
- state_next <= S_PUTCH;
+ if free = '1' and d_done = '1' and d_new_result = '0' and d_new_eingabe = '0' then
+ state_next <= S_PUTCH1;
end if;
- when S_PUTCH =>
+ when S_PUTCH1 =>
+ state_next <= S_PUTCH2;
+ when S_PUTCH2 =>
if free = '0' or (free = '1' and d_char = x"00") then
state_next <= S_WAIT;
end if;
end if;
when S_NOP1 =>
if free = '1' then
- if unsigned(d_spalte_int) = 71 then
- state_next <= SIDLE;
- else
- state_next <= S_COUNTUP;
- end if;
+ case istate_int is
+ when b"00000" => state_next <= S_NL1;
+ when b"00001" => state_next <= S_BLANK;
+ when b"00010" => state_next <= S_BACK;
+ when b"00011" => state_next <= S_ZEILEUP;
+ when b"00110" => state_next <= S_CR1;
+ when b"00101" => state_next <= S_NL1;
+
+ when b"10000" => state_next <= S_READ_RESULT_0;
+ when b"10001" => state_next <= S_READ_RESULT_1;
+ when b"10010" => state_next <= S_READ_RESULT_2;
+
+ when b"01000" => state_next <= S_PS1_0;
+ when b"01001" => state_next <= S_PS1_1;
+ when b"01010" => state_next <= S_PS1_2;
+ when b"01011" => state_next <= S_PS1_3;
+ when b"01100" => state_next <= S_PS1_4;
+ when b"01101" => state_next <= S_PS1_5;
+ when others => state_next <= SIDLE;
+ end case;
end if;
end case;
end process;
-- out
process(state_int, d_zeile_int, d_spalte_int, d_get_int, command_int,
command_data_int, d_char)
+ function zeile2char(i : std_logic_vector; stelle : natural) return hbyte is
+ subtype zeilnum is string(1 to 2);
+ type zeilnum_arr is array (natural range 0 to 49) of zeilnum;
+ constant zn : zeilnum_arr := (
+ 0 => "00", 1 => "01", 2 => "02", 3 => "03", 4 => "04",
+ 5 => "05", 6 => "06", 7 => "07", 8 => "08", 9 => "09",
+ 10 => "10", 11 => "11", 12 => "12", 13 => "13", 14 => "14",
+ 15 => "15", 16 => "16", 17 => "17", 18 => "18", 19 => "19",
+ 20 => "20", 21 => "21", 22 => "22", 23 => "23", 24 => "24",
+ 25 => "25", 26 => "26", 27 => "27", 28 => "28", 29 => "29",
+ 30 => "30", 31 => "31", 32 => "32", 33 => "33", 34 => "34",
+ 35 => "35", 36 => "36", 37 => "37", 38 => "38", 39 => "39",
+ 40 => "40", 41 => "41", 42 => "42", 43 => "43", 44 => "44",
+ 45 => "45", 46 => "46", 47 => "47", 48 => "48", 49 => "49",
+ others => "xy");
+ variable t : signed(hzeile'length downto 0);
+ begin
+ t := signed('0' & i);
+ t := t / 2;
+ return hbyte(to_unsigned(character'pos(zn(to_integer(t))(stelle)),8));
+ end;
begin
d_zeile_next <= d_zeile_int;
d_spalte_next <= d_spalte_int;
command_data_next <= command_data_int;
case state_int is
- when SIDLE =>
- null;
- when S_NEW_INPUT =>
- d_spalte_next <= (others => '0');
- when S_NEW_RESULT =>
+ when S_INIT => null;
+
+ when S_PS1_0 =>
+ command_next <= COMMAND_SET_CHAR;
+ command_data_next <= x"0000ff" & x"28"; -- '('
+ when S_PS1_1 =>
+ command_next <= COMMAND_SET_CHAR;
+ command_data_next <= x"00ff00" & zeile2char(d_zeile_int,1); -- 'x'
+ when S_PS1_2 =>
+ command_next <= COMMAND_SET_CHAR;
+ command_data_next <= x"00ff00" & zeile2char(d_zeile_int,2); -- 'y'
+ when S_PS1_3 =>
+ command_next <= COMMAND_SET_CHAR;
+ command_data_next <= x"0000ff" & x"29"; -- ')'
+ when S_PS1_4 =>
+ command_next <= COMMAND_SET_CHAR;
+ command_data_next <= x"00ffff" & x"24"; -- '$'
+ when S_PS1_5 =>
+ command_next <= COMMAND_SET_CHAR;
+ command_data_next <= x"ffffff" & x"20"; -- ' '
+
+ when SIDLE => null;
+ when S_NEW_RESULT => null;
+ when S_NEW_INPUT => null;
+
+ when S_NEW_BS =>
+ -- underflow check schon im history modul
+ d_spalte_next <= std_logic_vector(unsigned(d_spalte_int) - 1);
+ when S_BACK =>
+ -- einen schritt zurueck, +6 wegen $PS1
+ command_next <= COMMAND_SET_CURSOR_COLUMN;
+ command_data_next <= x"ffffff" & '0' & std_logic_vector(unsigned(d_spalte_int) + 6);
+ when S_BLANK =>
+ command_next <= COMMAND_SET_CHAR;
+ command_data_next <= x"ffffff" & x"20"; -- white space
+
+ when S_ZEILEUP =>
d_spalte_next <= (others => '0');
case d_zeile_int is
- when "11111" => d_zeile_next <= "00000";
+ -- 49 * 2 + 1
+ when "1100010" => d_zeile_next <= (others => '0');
when others => d_zeile_next <= std_logic_vector(unsigned(d_zeile_int) + 1);
end case;
+
+ when S_CR1 =>
+ command_next <= COMMAND_SET_CHAR;
+ command_data_next <= x"ffffff" & x"0d"; -- carrige return
+ when S_NL1 =>
+ command_next <= COMMAND_SET_CHAR;
+ command_data_next <= x"ffffff" & x"0a"; -- newline
+
+ when S_READ_RESULT_0 =>
+ command_next <= COMMAND_SET_CHAR;
+ command_data_next <= x"ff0000" & x"3e"; -- '>'
+ when S_READ_RESULT_1 =>
+ command_next <= COMMAND_SET_CHAR;
+ command_data_next <= x"ffffff" & x"20"; -- ' '
+ when S_READ_RESULT_2 => null;
+
when S_COUNTUP =>
d_get_next <= '1';
d_spalte_next <= std_logic_vector(unsigned(d_spalte_int) + 1);
when S_GETCH =>
d_get_next <= '1';
- when S_PUTCH =>
+ when S_PUTCH1 =>
if d_char /= x"00" then
command_next <= COMMAND_SET_CHAR;
command_data_next <= x"ffffff" & std_logic_vector(d_char);
end if;
+ when S_PUTCH2 => null;
when S_WAIT | S_NOP1 =>
command_next <= COMMAND_NOP;
command_data_next <= x"00000000";
projects / hwmod.git / blobdiff