各位答人，小弟初学乍练，想求一个计数显示电路（VHDL），键盘接口显示电路（VHDL）。
计数显示电路部分可逆计数电路（10进制）计数最大值256即可，显示电路用三个数码管。最高频率4M；
键盘接口显示电路部分3乘4键盘，0-9和两个功能键（清零，计数）。显示电路三位数码管分别致入。
如果哪位大哥肯帮忙，十分感谢。我的邮箱：BRIGHT_FW@yahoo.com.cn
我做了两个程序，但都是component调用有问题。
键盘接口显示电路：
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
library altera;
use altera.maxplus2.all;
entity debouncing is
port
(
d_in,clk :in std_logic;
dd1,dd0,qq1,qq0 ut std_logic;
d_out,d_out1ut std_logic
);
end debounce;
architecture a of debounce is
signal vcc,inv_d:std_logic;
signal d1,d0:std_logic;
begin
vcc<='t',
inv_d<=not d_in;
dff1:dff port map (d=>vcc,q=>q0,clk=>clk,clrn=>inv_d,prn=>vcc);
dff2:dff port map (d=>vcc,q=>q1,clk=>clk,clrn=>inv_d,prn=>vcc);
process(clk)
begin
if clk'event and clk='1' thn
d0<=not q1;
d1<=d0;
end if;
end process;
d_out<=not(d1 and not d0);
end a;
ibrary ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
library altera;
use altera.maxplus2.all;
entity keyboard is
port
(
clk_4m:in std_logic; --系统原始时钟脉冲
key_in:in std_logic_vector(2 downto 0); --按键输入
clk_scanut std_logic_vector(3 downto 0); --扫描序列
out_numbut std_logic_vector(3 downto 0); --数字输出
out_funcut std_logic_vector(3 downto 0); --功能输出
flag_numbut std_logic; --数字输出标志
flag_funcut std_logic; --功能输出标志
clk_debunceut std_logic; --弹跳电路取样时钟脉冲
clk_displayut std_logic_vector(1 downto 0) --显示器扫描信号
);
end keyboard;
architecture a of keyboard is
component debunce
port( clk :in std_logic;
d_in :in std_logic;
d_out ut std_logic);
end component;
signal clk :std_logic;
--电路工作时钟脉冲（4m降频而来）
signal c_keyboard:std_logic_vector(1 downto 0);
signal c_debunce:std_logic;
signal c_display :std_logic_vector(1 downto 0);
signal c :std_logic_vector(2 downto 0);
signal n :std_logic_vector(3 downto 0);
signal t :std_logic_vector(3 downto 0);
signal fn :std_logic;
signal ff :std_logic;
signal sel :std_logic_vector(3 downto 0);
begin
--connection 管脚信号连接
out_numb<=n;
out_func<=t;
flag_numb<=fn;
flag_func<=ff;
clk_debunce<=c_debunce;
clk_display<=c_display;
c_debunce<=clk;
--产生不同频率的信号
counter:block
signal q :std_logic_vector(19 downto 0);
signal s:std_logic_vector(1 downto 0);
signal sel:std_logic_vector(3 downto 0);
begin
process(clk_4m)
begin
if clk_4m'event and clk_4m='1'then
q<=q+1;
end if;
--c_keyboard<=q(18 downto 17);
--c_debunce<=q(14);
--c_dispaly<=q(18 downto 17);
c_keyboard<=q(5 downto 4);
clk<=q(0);
c_display<=q(5 downto 4);
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;
--debunce ckt
debunce:block
begin
u1:debunce port map(
d_in=>key_in(0),
d_out=>c(0),
clk=>c_debunce
);
u2:debunce port map(
d_in=>key_in(1),
d_out=>c(1),
clk=>c_debunce
);
u3:debunce port map(
d_in=>key_in(2),
d_out=>c(2),
clk=>c_debunce
);
end block debunce;
--key_decoder
key_decoder:block
signal z:std_logic_vector(4 downto 0);
begin
process(clk)
begin
z<=c_keyboard&c;
--数字按键编码
if clk'event and clk='1' then
case z is
when"11101"=>n<="0000";--0
when"00011"=>n<="0001";--1
when"00101"=>n<="0010";--2
when"00110"=>n<="0011";--3
when"01011"=>n<="0100";--4
when"01101"=>n<="0101";--5
when"01110"=>n<="0110";--6
when"10011"=>n<="0111";--7
when"10101"=>n<="1000";--8
when"10110"=>n<="1001";--9
when others =>n<="1111";
end case;
end if;
--功能按键编码
if clk'event and clk='1' then
case z is
when"11011"=>t<="0100";--*_clear
when"11110"=>t<="0001";--#_count
when others=>t<="1000";
end case;
end if;
--out_func<=t;
end process;
fn<=not (n(3) and n(2) and n(1) and n(0)); --产生数字按键标志
ff<=t(2) or t(0); --产生功能按键标志
end block key_decoder;
end a;
可以给我指点一下，或是给我一个例程都十分感谢。[em17] |
