display/history: unnoetiges weg, kthx

[hwmod.git] / src / display.vhd

diff --git a/src/display.vhd b/src/display.vhd
index d01b1150a45716f6fc9d8785531f9a65975f4f7d..ed8cac9a8e755afa053b2438b4a9e77982778b28 100644 (file)
--- a/src/display.vhd
+++ b/src/display.vhd
@@ -34,6 +34,7 @@ architecture beh of display is
        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;
@@ -46,6 +47,7 @@ begin
                if sys_res_n = '0' then
                        -- internal
                        state_int <= SIDLE;
+                       istate_int <= (others => '0');
                        -- out
                        d_zeile_int <= (others => '0');
                        d_spalte_int <= (others => '0');
@@ -55,6 +57,7 @@ begin
                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;
@@ -66,12 +69,14 @@ begin
 
        -- 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 SIDLE =>
+                               istate_next <= b"111"; -- default: immer wieder ins SIDLE;
                                if d_new_eingabe = '1' then
                                        state_next <= S_NEW_INPUT;
                                end if;
@@ -84,16 +89,18 @@ begin
                                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"; -- => wieder nach SIDLE
                                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 =>
@@ -108,11 +115,10 @@ begin
                                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;
@@ -131,7 +137,7 @@ begin
                        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