1
我的fpga是斯巴達3E-100 Cp132。我有四個按鈕作爲我的輸入，我想通過使用它們來增加電路板7段上的四位數字。 VHDL代碼低於：使用按鈕遞增七段
entity main is
port(b1,b2,b3,b4 : in STD_LOGIC;
clk : in STD_LOGIC;
sseg : out STD_LOGIC_VECTOR(0 to 6);
anodes : out STD_LOGIC_VECTOR(3 downto 0);
reset : in STD_LOGIC
);
end main;
architecture Behavioral of main is
signal bcd1, bcd2, bcd3, bcd4 : STD_LOGIC_VECTOR (3 downto 0);
signal clk2 : STD_LOGIC;
signal pushbuttons : STD_LOGIC_VECTOR(3 downto 0);
signal db_pushbuttons : STD_LOGIC_VECTOR(3 downto 0);
signal counter : STD_LOGIC_VECTOR(1 downto 0);
signal clk_divider : STD_LOGIC_VECTOR(20 downto 0);
component Debounce is
port(cclk : in STD_LOGIC;
inp : in STD_LOGIC_VECTOR(3 downto 0);
cclr : in STD_LOGIC;
db : out STD_LOGIC_VECTOR(3 downto 0)
);
end component;
begin
pushbuttons <= b4 & b3 & b2 & b1;
Db : Debounce port map
(cclk => clk2,
inp => pushbuttons,
cclr => reset,
db => db_pushbuttons);
process (clk)
begin
if rising_edge(clk) then
if clk_divider <= "1100001101010000" then
clk_divider <= clk_divider + 1;
clk2 <= '0';
else
clk_divider <= (others => '0');
clk2 <= '1';
end if;
end if;
end process;
process (clk2, reset)
begin
if reset = '1' then
-- do something here
bcd1 <= "0000";
bcd2 <= "0000";
bcd3 <= "0000";
bcd4 <= "0000";
elsif rising_edge(clk2) then
counter <= counter + 1;
if db_pushbuttons(0) = '1' then -- db_b1
if bcd1 <= "1000" then
bcd1 <= bcd1 + 1;
else
bcd1 <= "0000";
end if;
elsif db_pushbuttons(1) = '1' then -- db_b2
if bcd2 <= "1000" then
bcd2 <= bcd2 + 1;
else
bcd2 <= "0000";
end if;
elsif db_pushbuttons(2) = '1' then -- db_b3
if bcd3 <= "1000" then
bcd3 <= bcd3 + 1;
else
bcd3 <= "0000";
end if;
elsif db_pushbuttons(3) = '1' then --db_b4
if bcd4 <= "1000" then
bcd4 <= bcd4 + 1;
else
bcd4 <= "0000";
end if;
end if;
end if;
end process;
process (counter, bcd1, bcd2, bcd3, bcd4)
variable display : STD_LOGIC_VECTOR(3 downto 0);
begin
case counter is
when "00" => anodes <= "1110"; display := bcd1;
when "01" => anodes <= "1101"; display := bcd2;
when "10" => anodes <= "1011"; display := bcd3;
when "11" => anodes <= "0111"; display := bcd4;
when others => null;
end case;
case display is
when "0000" => sseg <= "0000001"; --0
when "0001" => sseg <= "1001111"; --1
when "0010" => sseg <= "0010010"; --2
when "0011" => sseg <= "0000110"; --3
when "0100" => sseg <= "1001100"; --4
when "0101" => sseg <= "0100100"; --5
when "0110" => sseg <= "0100000"; --6
when "0111" => sseg <= "0001111"; --7
when "1000" => sseg <= "0000000"; --8
when "1001" => sseg <= "0000100"; --9
when others => sseg <= "0010000"; --e, represents error
end case;
end process;
end Behavioral;
每個按鈕應該遞增相應的7段數字被一個（B1 - >最左邊的數字 - >最右邊的數字和b4）。問題是，當我按下按鈕時，它完成了這項工作，但並沒有增加一個按鈕，而是增加了一個任意數字。原因是它在時鐘2的每個上升沿增加1，並且由於此時鐘的頻率而發生得太快。我怎樣才能擺脫這個問題？我嘗試了幾次針對按鈕的debouncing代碼，但他們沒有那麼多幫助。我完全陷在這裏。我的意思是應該有辦法做到這一點，但怎麼做？順便說一句，我一直在使用的代碼去抖動碼以上
entity Debounce is
port(cclk : in STD_LOGIC;
inp : in STD_LOGIC_VECTOR(3 downto 0);
cclr : in STD_LOGIC;
db : out STD_LOGIC_VECTOR(3 downto 0)
);
end Debounce;
architecture Behavioral of Debounce is
signal delay1, delay2, delay3 : STD_LOGIC_VECTOR(3 downto 0);
begin
process (cclk, cclr)
begin
if cclr = '1' then
delay1 <= "0000";
delay2 <= "0000";
delay3 <= "0000";
elsif rising_edge(cclk) then
delay1 <= inp;
delay2 <= delay1;
delay3 <= delay2;
end if;
end process;
db <= delay1 and delay2 and delay3;
end Behavioral;
因此，任何幫助將不勝感激，謝謝提前！
clk的頻率是多少？ – Josh
我猜應該是50MHz。它是FPGA上的標準時鍾。 – user3100463