基于ＦＰＧＡ的秒表的设计

yz416154664 2011-1-9 13:09 楼主

课程设计刚做完，发个秒表的程序分享下。
实验版是Ａｌｔｅｒａ公司的ｅｐ２ｃ５ｑ２０８ｃ８，晶振为５０Ｍｈｚ。
功能为复位，启停，用６为数码管显示。精确到１/１００ｓ。
程序为：
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
--------------实体----------------
ENTITY jishuqi IS
PORT(start_stop,res,clk:IN STD_LOGIC;
sel:OUT STD_LOGIC_VECTOR (2 DOWNTO 0);
data:OUT STD_LOGIC_VECTOR (6 DOWNTO 0));
END jishuqi;
--------------构造体-------------------------------------
ARCHITECTURE rtl OF jishuqi IS
SIGNAL clk_1:STD_LOGIC;
SIGNAL clk_2:STD_LOGIC;
SIGNAL Flag_1:STD_LOGIC:='0';
SIGNAL Flag_2:STD_LOGIC:='0';
BEGIN
---------------分频-----------------------------------
PROCESS(clk)
VARIABLE count:integer:=0;
BEGIN
IF(clk'event AND clk='1') THEN
count:=count+1;
IF(count <= 390) THEN
clk_1<='0';
END IF;
IF(count > 390 ) THEN
clk_1<='1';
END IF;
IF(count >= 790 ) THEN
count:=0;
END IF;
END IF;
END PROCESS;
--------------------------------------------------------
PROCESS(clk)
VARIABLE count_1:integer:=0;
BEGIN
IF(clk'event AND clk='1') THEN
count_1 := count_1 + 1;
IF(count_1 <= 159999) THEN
clk_2 <= '0';
END IF;
IF(count_1 > 159999) THEN
clk_2 <= '1';
END IF;
IF(count_1 >= 319999) THEN
count_1 := 0;
END IF;
END IF;
END PROCESS;
--------------------计数-----------------------------------
PROCESS(clk_1,clk_2,start_stop,res)
VARIABLE temp:integer:=0;
VARIABLE odata:integer:=0;
VARIABLE second_1:integer:=0;
VARIABLE second_2:integer:=0;
VARIABLE second_3:integer:=0;
VARIABLE second_4:integer:=0;
VARIABLE second_5:integer:=0;
VARIABLE second_6:integer:=0;
BEGIN
IF(clk_2'EVENT AND clk_2='1' AND Flag_1 = '1') THEN
second_1 := second_1 + 1;
IF(second_1 = 10) THEN
second_1 := 0;
second_2 := second_2 + 1;
END IF;
IF(second_2 = 10) THEN
second_2 := 0;
second_3 := second_3 + 1;
END IF;
IF(second_3 = 10) THEN
second_3 := 0;
second_4 := second_4 + 1;
END IF;
IF(second_4 = 6) THEN
second_4 := 0;
second_5 := second_5 + 1;
END IF;
IF(second_5 = 10) THEN
second_5 := 0;
second_6 := second_6 + 1;
END IF;
IF(second_6 = 6) THEN
second_6 := 0;
END IF;
END IF;

if (res='1') then

second_1:=0;

second_2:=0;

second_3:=0;

second_4:=0;

second_5:=0;

second_6:=0;

end if;

-----------------------位选------------------------------------
IF(clk_1'EVENT AND clk_1='1') THEN
temp:= temp + 1;
IF(temp = 1) THEN
sel <= "010";
odata := second_6;
ELSIF(temp = 2) THEN
sel <= "011";
odata := second_5;
ELSIF(temp = 3) THEN
sel <= "100";
odata := second_4;
ELSIF(temp = 4) THEN
sel <= "101";
odata := second_3;
ELSIF(temp = 5) THEN
sel <= "110";
odata := second_2;
ELSIF(temp = 6) THEN
sel <= "111";
odata := second_1;
temp:= 0;
END IF;
END IF;
----------------------显示--------------------------------
IF(odata = 0) THEN data<="0111111";
ELSIF(odata = 1) THEN data<="0000110";
ELSIF(odata = 2) THEN data<="1011011";
ELSIF(odata = 3) THEN data<="1001111";
ELSIF(odata = 4) THEN data<="1100110";
ELSIF(odata = 5) THEN data<="1101101";
ELSIF(odata = 6) THEN data<="1111101";
ELSIF(odata = 7) THEN data<="0000111";
ELSIF(odata = 8) THEN data<="1111111";
ELSIF(odata = 9) THEN data<="1101111";
ELSE
data<="XXXXXXX";
END IF;
END PROCESS;
---------------------起停------------------------------------
PROCESS(start_stop)
BEGIN
IF(start_stop'EVENT AND start_stop='0') THEN
Flag_1 <= NOT Flag_1;
END IF;
END PROCESS;
END rtl;