键盘部分VHDL代码是这样的

huangxianxiao

-- Keyboard
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_ARITH.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY keyboard IS
PORT(
    CLK_1K:     IN     STD_LOGIC;     --系统原始时钟脉冲(1KHz)
    KEY_IN:     IN     STD_LOGIC_VECTOR(3 DOWNTO 0);         --按键输入
    CLK_SCAN,CC:     OUT     STD_LOGIC_VECTOR(3 DOWNTO 0);     --键盘扫描输出     KBY_OUT:     OUT     STD_LOGIC_VECTOR(9 DOWNTO 0));         --键盘数据输出
                           
END ENTITY KEYBOARD;
ARCHITECTURE ART OF KEYBOARD IS
COMPONENT DEBOUNCING IS
PORT(
    D_IN,CLK:IN     STD_LOGIC;
    D_OUT:     OUT     STD_LOGIC);
   
END COMPONENT DEBOUNCING;    --其中ＤＥＢＯＵＮＣＩＮＧ是消抖电路
   
SIGNAL CLK:STD_LOGIC;     --电路工作时钟脉冲
SIGNAL C_KEYBOARD:STD_LOGIC_VECTOR(1 DOWNTO 0);     --键扫信号“00-01-10-11”寄存器
SIGNAL C_DEBOUNCE:STD_LOGIC;     　　　　　　        --去抖动电路时钟
SIGNAL C:STD_LOGIC_VECTOR(3 DOWNTO 0);                --键盘输入去抖动后的寄存器
SIGNAL N,F:STD_LOGIC_VECTOR(3 DOWNTO 0);         --数字、功能按键译码值的寄存器
SIGNAL FN,FF: STD_LOGIC;                 --数字、功能按键标志值数字、功能按键
SIGNAL SEL: STD_LOGIC_VECTOR(3 DOWNTO 0);
BEGIN
KBY_OUT <= FF & FN & F & N;
--扫描信号发生器   
COUNTER: BLOCK IS
    SIGNAL Q: STD_LOGIC_VECTOR(9 DOWNTO 0);
    SIGNAL SEL: STD_LOGIC_VECTOR(3 DOWNTO 0);
    BEGIN
    PROCESS(CLK_1K,Q)
        BEGIN
        IF(CLK_1K'EVENT AND CLK_1K='1') THEN
            Q <= Q + 1;
        END IF;
        C_DEBOUNCE <= Q(2);
        C_KEYBOARD <= Q(9 DOWNTO 8);
        CLK <= Q(0);
    END PROCESS;
   
    SEL <=     "1110" WHEN C_KEYBOARD = 0 ELSE
            "1101" WHEN C_KEYBOARD = 1 ELSE
            "1011" WHEN C_KEYBOARD = 2 ELSE
            "0111" WHEN C_KEYBOARD = 3 ELSE
            "1111" ;
    CLK_SCAN <= SEL;
   
    END BLOCK COUNTER;
   
    --键盘去抖
DEBOUNUING :BLOCK IS
BEGIN
U1: DEBOUNCING PORT MAP (D_IN => NOT KEY_IN(0), CLK => C_DEBOUNCE, D_OUT => C(0));
U2: DEBOUNCING PORT MAP (D_IN => NOT KEY_IN(1), CLK => C_DEBOUNCE, D_OUT => C(1));
U3: DEBOUNCING PORT MAP (D_IN => NOT KEY_IN(2), CLK => C_DEBOUNCE, D_OUT => C(2));
U4: DEBOUNCING PORT MAP (D_IN => NOT KEY_IN(3), CLK => C_DEBOUNCE, D_OUT => C(3));
CC <= C;
END BLOCK DEBOUNUING;
   
    --键盘译码
KEY_DECODER: BLOCK
SIGNAL Z: STD_LOGIC_VECTOR(5 DOWNTO 0);             --按键位置
BEGIN
PROCESS(CLK,C_KEYBOARD,C)
BEGIN
Z <= C_KEYBOARD & C;                 --读入的编码与扫描结果拼接
IF CLK'EVENT AND CLK='1' THEN
CASE Z IS
        WHEN "111011" => N <= "0000";         --按键 '0'
        WHEN "000111" => N <= "0001";         --按键 '1'
        WHEN "001011" => N <= "0010";         --按键 '2'
        WHEN "001101" => N <= "0011";         --按键 '3'
        WHEN "010111" => N <= "0100";         --按键 '4'
        WHEN "011011" => N <= "0101";         --按键 '5'
        WHEN "011101" => N <= "0110";         --按键 '6'
        WHEN "100111" => N <= "0111";         --按键 '7'
        WHEN "101011" => N <= "1000";         --按键 '8'
        WHEN "101101" => N <= "1001";         --按键 '9'
        WHEN OTHERS    => N <= "1111";
        END CASE;
    END IF;
IF CLK'EVENT AND CLK = '1' THEN
    CASE Z IS
    WHEN "110111" => F <= "0001";         --按键 '*'
    WHEN "111101" => F <= "0010";         --按键 '#'
    WHEN "001110" => F <= "0011";         --按键 'F1'
    WHEN "011110" => F <= "0100";         --按键 'F2'
    WHEN "101110" => F <= "0101";         --按键 'F3'
    WHEN "111110" => F <= "0110";         --按键 'F4'
    WHEN OTHERS    => F <= "1111";
    END CASE;
END IF;
END PROCESS;
    FN <= NOT(N(3) AND N(2) AND N(1) AND N(0));
    FF <= NOT(F(3) AND F(2) AND F(1) AND F(0));
END BLOCK KEY_DECODER;
END ARCHITECTURE ART;

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