end entity display;
architecture beh of display is
- type DISPLAY_STATE is (SIDLE, S_NEW_RESULT, S_NEW_INPUT, S_COUNTUP, S_GETCH,
+ type DISPLAY_STATE is (S_INIT, SIDLE, S_NEW_RESULT, S_NEW_INPUT, S_COUNTUP, S_GETCH,
S_CR1, S_NL1, S_PUTCH1, S_PUTCH2, S_WAIT, S_NOP1);
signal state_int, state_next : DISPLAY_STATE;
signal d_zeile_int, d_zeile_next : hzeile;
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(2 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;
-- next state
process(state_int, d_new_result, d_new_eingabe, d_done, free, d_spalte_int,
- d_char)
+ d_char, istate_int)
begin
state_next <= state_int;
+ istate_next <= istate_int;
case state_int is
+ when S_INIT =>
+ state_next <= SIDLE;
when SIDLE =>
if d_new_eingabe = '1' then
state_next <= S_NEW_INPUT;
state_next <= S_COUNTUP;
when S_CR1 =>
if free = '0' then
- state_next <= S_NL1;
+ state_next <= S_WAIT;
+ istate_next <= b"000"; -- => danach S_NL1
end if;
when S_NL1 =>
if free = '0' then
- state_next <= S_COUNTUP;
+ state_next <= S_WAIT;
+ istate_next <= b"111";
end if;
when S_COUNTUP =>
state_next <= S_GETCH;
when S_GETCH =>
- if free = '1' and d_done = '1' then
+ 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_PUTCH1 =>
when S_PUTCH2 =>
if free = '0' or (free = '1' and d_char = x"00") then
state_next <= S_WAIT;
+ istate_next <= b"111";
end if;
when S_WAIT =>
if free = '1' and d_done = '0' then
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"000" => state_next <= S_NL1;
+ when others => state_next <= SIDLE;
+ end case;
end if;
end case;
end process;
command_data_next <= command_data_int;
case state_int is
+ when S_INIT =>
+ d_spalte_next <= (others => '0');
+ d_zeile_next <= (others => '0');
when SIDLE =>
null;
when S_NEW_INPUT =>
- d_spalte_next <= (others => '0');
+ null;
when S_NEW_RESULT =>
d_spalte_next <= (others => '0');
case d_zeile_int is