repo2/chameleon2/c64.patch
| 872 | markw | Index: ../chameleon/chameleon_c64_joykeyb.vhd
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===================================================================
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--- ../chameleon/chameleon_c64_joykeyb.vhd (revision 126)
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+++ ../chameleon/chameleon_c64_joykeyb.vhd (revision 871)
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@@ -85,8 +85,13 @@
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signal cnt : unsigned(3 downto 0) := (others => '0');
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signal col : integer range 0 to 7 := 0;
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signal keys_reg : unsigned(63 downto 0) := (others => '1');
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+ signal last_keys_reg : unsigned(63 downto 0) := (others => '1');
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+ signal approved_keys_reg : unsigned(63 downto 0) := (others => '1');
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+ signal joystick1_reg : unsigned(4 downto 0);
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+ signal joystick1_prev_reg : unsigned(4 downto 0);
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+ signal joystick2_prev_reg : unsigned(4 downto 0);
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begin
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- keys <= keys_reg;
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+ keys <= approved_keys_reg;
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req <= req_reg;
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process(clk)
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@@ -193,6 +198,8 @@
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a <= X"DC00";
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req_reg <= not req_reg;
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joystick1 <= d(4 downto 0);
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+ joystick1_prev_reg <= joystick1_reg;
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+ joystick1_reg <= d(4 downto 0);
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state <= STORE_JOY2;
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when STORE_JOY2 =>
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joystick2 <= d(4 downto 0);
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@@ -200,6 +207,12 @@
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if enable_4player then
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state <= READ_JOY34;
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end if;
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+ last_keys_reg <= keys_reg;
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+ if ((joystick1_reg and d(4 downto 0) and joystick1_prev_reg and joystick2_prev_reg) = "11111" and last_keys_reg = keys_reg) then
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+ approved_keys_reg <= keys_reg;
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+ end if;
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+ joystick2_prev_reg <= d(4 downto 0);
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+
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when READ_JOY34 =>
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-- read user port for joystick 3 or 4
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we <= '0';
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