第一段程序:
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_ARITH.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
EN
tiTY pwmgen IS
generic
(
f_len:natural:=9;
delay_len:natural:=9;
dead:natural:=5
);
port(
rst,clk:in std_logic;
feedin:in std_logic;
di:in std_logic;
--delay:in std_logic_vector(f_len-1 downto 0);
pwm1,pwm3,pwm2,pwm4:out std_logic
);
end entity pwmgen ;
architecture bhv of pwmgen is
signal tm,pwm10,pwm20,pwm30,pwm40:std_logic;
signal delay_r:std_logic_vector(delay_len+f_len-1 downto 0);
signal cmp,cmp_dead:std_logic_vector(f_len-1 downto 0);
signal f,fi:std_logic_vector(f_len-1 downto 0);
signal delay:std_logic_vector(f_len-1 downto 0):="011001100";
signal feedcount:std_logic_vector(11 downto 0):="000000000000";
signal close:std_logic:='0';
signal dis: std_logic;
component fcounter
generic
(
f_len:natural:=9;
f_delta:natural:=10
);
port(
rst,clk,di:in std_logic;
f,fi:out std_logic_vector(f_len-1 downto 0);
tm:out std_logic
);
end component;
begin
d1:process(clk,close)
begin
if close='0' then
if clk'event and clk='1' then
if feedcount<"111111111100" then
feedcount<=feedcount+'1';
dis<=di;
-- di1<=dis;
else
close<='1';
dis<=feedin;
-- di1<=dis;
end if;
end if;
else
dis<=feedin;
-- di1<=dis;
end if;
end process;
fc1:fcounter generic map(9,10) port map(rst,clk,dis,f,fi,tm);
delay_r<=delay*f;
cmp<=delay_r(delay_len+f_len-1 downto delay_len);
cmp_dead<="0"&f(f'length-1 downto 1)-dead;
--adad
d:process(clk,rst)
begin
if rst='0' then
pwm10<='0';
pwm20<='0';
pwm30<='0';
pwm40<='0';
elsif clk'event and clk='1' then
if (fi>=0 and fi<cmp ) then
if tm='1' then pwm10<='1';end if;
if tm='0' then pwm20<='1';end if;
else
pwm10<='0';
pwm20<='0';
end if;
if (fi>dead and fi<cmp_dead) then
if tm='1' then pwm30<='1';end if;
if tm='0' then pwm40<='1';end if;
else
pwm30<='0';
pwm40<='0';
end if;
end if;
end process;
pwm1<=pwm10 and pwm30;
pwm3<=pwm20 and pwm40;
pwm2<=not dis;
pwm4<=dis;
end bhv;
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_ARITH.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
entity fcounter is
generic
(
f_len:natural:=9; --棰戠巼鏈€澶ц鏁
f_delta:natural:=10
);
port(
rst,clk,di:in std_logic;
f,fi:out std_logic_vector(f_len-1 downto 0);
tm:out std_logic
);
end entity fcounter ;
architecture bhv of fcounter is
type f_reg_type is array (natural range<>) of std_logic_vector(f_len-1 downto 0);
signal f_reg:f_reg_type(2+2 downto 0);
signal fsum:std_logic_vector(f_len-1+2 downto 0);
signal di_reg:std_logic_vector(3 downto 0);
signal di_rise,di_fall:std_logic;
signal cnt:std_logic_vector(f_len-1 downto 0);
begin
fsum<="00"&f_reg(0)+f_reg(1)+f_reg(2)+f_reg(2);
f<=fsum(f_len-1+2 downto 2);
fi<=cnt;
count:process(clk,rst)
begin
if rst='0' then
di_reg<=(others=>'0');
f_reg<=(others=>(others=>'0'));
cnt<=(others=>'0');
tm<='0';
elsif clk'event and clk='1' then
cnt<=cnt+'1';
di_reg<=di_reg(2 downto 0)&di;
if di_rise='1' then
f_reg(4)<=cnt;
cnt<=(others=>'0');
tm<='1';
end if;
if di_fall='1' then
f_reg(3)<=cnt;
cnt<=(others=>'0');
tm<='0';
end if;
if (f_reg(3)>f_reg(4) and f_reg(3)-f_delta<f_reg(4))
or (f_reg(3)<f_reg(4) and f_reg(3)+f_delta>f_reg(4)) then
f_reg(2 downto 0)<=f_reg(1 downto 0)&(f_reg(3)+f_reg(4));
end if;
end if;
end process;
di_rise<= '1' when (di_reg(2)='0' and di_reg(1)='0'and di_reg(0)='1' and di='1') else '0';
di_fall<= '1' when (di_reg(2)='1' and di_reg(1)='1'and di_reg(0)='0' and di='0') else '0';
end bhv;
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