First working version with beh simulation

[hwmod.git] / src / pc_communication.vhd

diff --git a/src/pc_communication.vhd b/src/pc_communication.vhd
index 06884f00a28e858ad72b76972c9e7b63ecd50c21..44e43cdfc0ad6616cc52295ef3d1b299eb635348 100644 (file)
--- a/src/pc_communication.vhd
+++ b/src/pc_communication.vhd
@@ -32,8 +32,8 @@ end entity pc_communication;
 architecture beh of pc_communication is
        signal push_history, push_history_next : std_logic;
 
-       signal spalte, spalte_next : integer range 0 to 71;
-       signal zeile , zeile_next : integer range 0 to 71;
+       signal spalte, spalte_next : integer range 1 to 73;
+       signal zeile , zeile_next : integer range 1 to 73;
        signal spalte_up, spalte_up_next : std_logic;
        signal get, get_next : std_logic;
        signal new_i, new_i_next : std_logic;
@@ -61,8 +61,8 @@ begin
                if sys_res_n = '0' then
                        state <= IDLE;
                        push_history <= '0';
-                       spalte <= 0;
-                       zeile <= 0;
+                       spalte <= 1;
+                       zeile <= 1;
                        get <= '0';
                        new_i <= '0';
                        tx_data <= "00000000";
@@ -86,11 +86,18 @@ begin
        process (spalte_up, spalte, zeile)
        begin
                if (spalte_up = '1') then
-                       if (spalte > 71) then
-                               spalte_next <= 0;
-                               zeile_next <= zeile + 1;
+                       if (spalte > 72) then
+                               if zeile + 1 > 50 then 
+                                       spalte_next <= 1;
+                                       zeile_next <= 1;
+                                       --done <= '1'; lets assume this false
+                                       assert false severity failure;
+                               else
+                                       spalte_next <= 1;
+                                       zeile_next <= zeile + 1;
+                               end if;
                        else
-                               spalte_next <= spalte + 1;
+                               spalte_next <= spalte + 1; --overflow here!
                                zeile_next <= zeile;
                        end if;
                else