【发布时间】：2017-03-25 23:25:01
【问题描述】：
如何使我的 currenttempinc 信号递减。到目前为止，我只能让 currenttempinc 信号增加。这就是我试图减少信号 currenttempdec
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use ieee.std_logic_unsigned.all;
entity question4 is
Port (
--System Clock Declaration--------------------------
clk: in std_logic;
--Button Inputs-------------------------------------
btnU: in std_logic; --Clear
btnD: in std_logic; --Reset
sw: in std_logic_vector(15 downto 0);
led: out std_logic_vector(15 downto 0)
);
end question4;
architecture Behavioral of question4 is
constant active: std_logic := '1';
constant bloweron: std_logic_vector(15 downto 0) := "0000000011111111";
constant compon: std_logic_vector(15 downto 0) := "1111111100000000";
constant blowonandcompon : std_logic_vector (15 downto 0) := "1111111111111111";
constant blowoffandcompoff: std_logic_vector (15 downto 0) := "0000000000000000";
signal clear: std_logic := btnU;
signal reset: std_logic := btnD;
signal settemp: std_logic_vector := sw(7 downto 0);
signal temp_speed: std_logic;
signal currenttempinc: std_logic_vector(7 downto 0);
signal currenttempdec: std_logic_vector(7 downto 0):= "11111111";
signal start_current_tempup: std_logic := sw(15);
signal start_current_tempdown: std_logic := sw(14);
type states is (blowoncompoff,
blowoffcompoff,
blowoncompon);
signal CurrentState: states;
signal NextState: states;
begin
SpeedControl: process (clk, reset)
variable counter: integer range 0 to 100000000;
begin
temp_speed <= not active;
if Reset = Active then
counter:= 0;
elsif (rising_edge (clk)) then --addded
counter := counter + 1;
if (counter=100000000) then
temp_speed <= Active;
counter:=0;
end if;
end if;
end process;
State_Register: process (clk, Reset)
begin
if Reset = active then
CurrentState <= blowoffcompoff;
elsif (rising_edge(clk)) then
CurrentState <= NextState;
end if;
end process;
motorstatetrans: process(currentstate, currenttempinc, settemp, clear, temp_speed)
begin
case currentstate is
when blowoncompon =>
led <= blowonandcompon;
if temp_speed = active then
if currenttempinc=settemp then
Nextstate <= blowoncompoff;
elsif currenttempinc < settemp then
Nextstate <= blowoncompon;
end if;
end if;
when blowoncompoff =>
led <= bloweron;
if temp_speed = active then
if currenttempinc < settemp then
Nextstate <= blowoncompon;
elsif currenttempinc > settemp then --changed from = to >
Nextstate <= blowoffcompoff;
else Nextstate <= blowoncompoff;
end if;
end if;
when blowoffcompoff =>
led <=blowoffandcompoff;
if temp_speed = active then
if currenttempinc < settemp then
Nextstate <= blowoncompon;
elsif currenttempinc > settemp or currenttempinc = settemp then
Nextstate <= blowoffcompoff;
end if;
end if;
end case;
end process;
current_temperature: process (reset,clear, clk)
begin
if rising_edge (clk) then
if reset = active or clear = active then
currenttempinc <= "00000000";
elsif temp_speed = active and start_current_tempup=active and start_current_tempdown = not active then
currenttempinc <= currenttempinc + 1 ;
if currenttempinc = "11111111" then
currenttempinc <= "00000000";
end if;
elsif temp_speed = active and start_current_tempdown = active and start_current_tempup = not active then
currenttempinc <= currenttempinc - 1;
if currenttempinc = "00000000" then
currenttempinc <= "11111111";
end if;
end if;
end if;
end process;
end behavioral;
【问题讨论】：
-
如果在错误的地方结束。
-
如果我应该把结尾移到这里吗？
-
这样吗？ currenttempinc
-
正确格式化您的代码，您应该会看到它。
-
依然不会递减。