大家好，这是一个ps2键盘实验， ps2clk;ps2data 是键盘的时钟，数据输入，dataout是经过下面程序一系列转化而成的键盘的扫描码，我不明白ps2clk，ps2data的内容是什么，是怎样转化为扫描码的，还请大家给我一个答案，在这里先谢谢各位啦！（红色部分尤其不懂）
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
---- Uncomment the following library declaration if instantiating
---- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;
entity key_board is
port( clr : in std_logic;
clk400 : in std_logic; --400KHZ
ps2clk : in std_logic;
ps2data : in std_logic;
dataout : out std_logic_vector(15 downto 0)
);
end key_board;
architecture Behavioral of key_board is
signal clk : std_logic:='0';
signal data : std_logic:='0';
signal shift1,shift2 : std_logic_vector(10 downto 0);
signal ps2c,ps2d : std_logic;
begin
ps2c<=ps2clk;
ps2d<=ps2data;
dataout<=shift1(8 downto 1) & shift2(8 downto 1);
process(clk400,clr)
variable tempclk : std_logic_vector(7 downto 0):=X"00";
variable tempdata: std_logic_vector(7 downto 0):=X"00";
begin
if(clr='0') then
tempclk:=X"00";
tempdata:=X"00";
clk<='0';
data<='0';
else if(clk400'event and clk400='1') then
tempclk(0):=ps2c;
tempclk(7 downto 1):=tempclk(6 downto 0);
tempdata(0):=ps2d;
tempdata(7 downto 1):=tempdata(6 downto 0);
end if;
end if;
if(tempclk="11111111") then
clk<='1';
else
if(tempclk="00000000") then
clk<='0';
end if;
end if;
if(tempdata="11111111") then
data<='1';
else
if(tempdata="00000000") then
data<='0';
end if;
end if;
end process;
process(clk,clr)
begin
if(clr='0')then
shift1<=(others => '0');
shift2<=(others => '0');
else if(clk'event and clk='0') then
shift1(10)<=data;
shift1(9 downto 0)<=shift1(10 downto 1);
shift2(10)<=shift1(0);
shift2(9 downto 0)<=shift2(10 downto 1);
-- shift1(0)<=data;
-- shift1(10 downto 1)<=shift1(9 downto 0);
-- shift2(0)<=shift1(10);
-- shift2(10 downto 1)<=shift2(9 downto 0);
end if;
end if;
end process;
end Behavioral; |
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