merge #1

2 files changed, 85 insertions, 5 deletions

diff --git a/src/dispshift.vhd b/src/dispshift.vhd
index 5669641..4c4093b 100644
--- a/src/dispshift.vhd
+++ b/src/dispshift.vhd
@@ -11,7 +11,29 @@ end dispshift;
 
 architecture Behavioral of dispshift is
 
-begin
-
+-- init as empty display
+signal sD: std_logic_vector(11 downto 0) := x"aaa";
+signal SLastValue: std_logic := '0';
 
+begin
+    process(CLK)
+    begin
+        if (rising_edge (clk)) then
+            -- set default values
+            SLastValue <= S;
+            sD <= sD;
+            
+            -- when S does go high update output
+            if (SLastValue = '0' and S = '1') then   
+                -- set data on output             
+                N3 <= sD(11 downto 8);
+                N2 <= sD(7 downto 4);
+                N1 <= sD(3 downto 0);
+                N0 <= D; 
+                
+                -- store new data
+                sD <= sD(7 downto 0) & D;
+            end if;
+        end if;    
+    end process;
 end Behavioral;
diff --git a/src/scancodefilter.vhd b/src/scancodefilter.vhd
index 518c3aa..dbdf7b7 100644
--- a/src/scancodefilter.vhd
+++ b/src/scancodefilter.vhd
@@ -1,6 +1,6 @@
 library ieee;
 use ieee.std_logic_1164.all;
---use ieee.numeric_std.all;
+use ieee.numeric_std.all;
 
 entity scancodefilter is port(
 	CLK: in std_logic; -- system clock
@@ -12,7 +12,65 @@ end scancodefilter;
 
 architecture Behavioral of scancodefilter is
 
-begin
-
+-- init as empty key
+--signal lastKey: std_logic_vector(3 downto 0) := x"a";
+signal lastNEW_DAT: std_logic := '0';
+signal DAT_OLD: std_logic_vector(7 downto 0); -- scancode preveouse input
 
+begin
+    process(CLK)
+    begin
+        if (rising_edge (clk)) then
+            -- always set data on output             
+            BCD <= x"a";
+            SHIFT <= '0';
+            lastNEW_DAT <= NEW_DAT;
+            DAT_OLD <= DAT_OLD;
+            
+            -- when NEW_DAT does go high
+            if ((lastNEW_DAT = '0') and (NEW_DAT = '1')) then    
+                -- set DAT_OLD
+                DAT_OLD <= DAT;
+                         
+                -- only is pervioause data is not release of key scancode and currend data
+                if (DAT_OLD /= x"F0" and DAT /= x"F0") then     
+                    case DAT is
+                        when x"45" =>
+                            BCD <= std_logic_vector(to_unsigned(0, BCD'length));
+                            SHIFT <= '1';
+                        when x"16" =>
+                            BCD <= std_logic_vector(to_unsigned(1, BCD'length));
+                            SHIFT <= '1';
+                        when x"1E" =>
+                            BCD <= std_logic_vector(to_unsigned(2, BCD'length));
+                            SHIFT <= '1';
+                        when x"26" =>
+                            BCD <= std_logic_vector(to_unsigned(3, BCD'length));
+                            SHIFT <= '1';
+                        when x"25" =>
+                            BCD <= std_logic_vector(to_unsigned(4, BCD'length));
+                            SHIFT <= '1';
+                        when x"2E" =>
+                            BCD <= std_logic_vector(to_unsigned(5, BCD'length));
+                            SHIFT <= '1';
+                        when x"36" =>
+                            BCD <= std_logic_vector(to_unsigned(6, BCD'length));
+                            SHIFT <= '1';
+                        when x"3D" =>
+                            BCD <= std_logic_vector(to_unsigned(7, BCD'length));
+                            SHIFT <= '1';
+                        when x"3E" =>
+                            BCD <= std_logic_vector(to_unsigned(8, BCD'length));
+                            SHIFT <= '1';
+                        when x"46" =>
+                            BCD <= std_logic_vector(to_unsigned(9, BCD'length));
+                            SHIFT <= '1';
+                        when others =>
+                            BCD <= x"b";
+                            SHIFT <= '1';
+                    end case;
+                end if;
+            end if;
+        end if;     
+    end process;
 end Behavioral;