LIBRARY IEEE;
USE IEEE.std_logic_1164.ALL;
USE IEEE.std_logic_unsigned.all;
USE IEEE.std_logic_arith.all;

ENTITY dccount IS
	port ( 
          	  clk	: IN	STD_LOGIC;
              AI : IN STD_LOGIC_VECTOR(3 DOWNTO 0);
              CO : out STD_LOGIC_VECTOR(3 DOWNTO 0);
       		  pulse: IN STD_LOGIC;
              driverA,driverB: OUT STD_LOGIC;
              S : OUT STD_LOGIC_VECTOR(6 DOWNTO 0);
              P : OUT STD_LOGIC_VECTOR(5 DOWNTO 0);
			 sp	: out STD_LOGIC);

END dccount;
ARCHITECTURE a OF dccount IS 
SIGNAL f:  STD_LOGIC_VECTOR(5 downto 0);
SIGNAL f_hz: STD_LOGIC;
SIGNAL OSC: STD_LOGIC;
SIGNAL OSC1: STD_LOGIC;
SIGNAL C: STD_LOGIC_VECTOR(3 DOWNTO 0);
SIGNAL A: STD_LOGIC_VECTOR(3 DOWNTO 0);
SIGNAL CODE: STD_LOGIC_VECTOR(2 DOWNTO 0);
SIGNAL bcd:STD_LOGIC_VECTOR(23 downto 0);
SIGNAL COUNT:STD_LOGIC_VECTOR(23 downto 0);
SIGNAL SUM: STD_LOGIC_VECTOR(4 DOWNTO 0);
SIGNAL D: STD_LOGIC_VECTOR(3 DOWNTO 0):="0000";
SIGNAL ind_coil: STD_LOGIC_VECTOR(3 downto 0) := "0001";
SIGNAL Hz:STD_LOGIC;
SIGNAL spo: STD_LOGIC;
SIGNAL SW:STD_LOGIC;
SIGNAL KEY:STD_LOGIC;
SIGNAL DRA,DRB:STD_LOGIC;
BEGIN
DRIVERA<=DRA;
DRIVERB<=DRB;
p(5 downto 0) <= f(5 downto 0);
CO(3 DOWNTO 0) <=C(3 DOWNTO 0);	
A (3 DOWNTO 0)<=AI(3 DOWNTO 0);

SP<=SPO;
-----------------div------------------------
PROCESS(OSC)
	VARIABLE d_ff: STD_LOGIC_VECTOR(20 downto 0);
    VARIABLE DELAY: STD_LOGIC_VECTOR(23 DOWNTO 0);
  BEGIN

 WAIT UNTIL clk = '1';
		IF d_ff(20 downto 0) >= 2E6 THEN
		    d_ff(20 downto 0) := "000000000000000000000";
		ELSE
		    d_ff(20 downto 0) := d_ff + 1;
		END IF;
		f_hz <= not d_ff(6);	
        OSC <= not d_ff(10);
	    OSC1 <= not d_ff(17);
        IF DELAY>=500000 THEN
           DELAY:="000000000000000000000000";HZ<=NOT Hz;
        ELSE DELAY:=DELAY+1; 
        END IF;


END PROCESS ;
----------------------------------------------
	PROCESS (F_HZ,OSC,OSC1,HZ,PULSE)
    VARIABLE B: STD_LOGIC;
    VARIABLE INT: STD_LOGIC;
	VARIABLE Data: STD_LOGIC_VECTOR(3 DOWNTO 0);
    VARIABLE UP: STD_LOGIC_VECTOR(2 DOWNTO 0);
	VARIABLE  ST:STD_LOGIC_VECTOR(2 DOWNTO 0);
    VARIABLE seq: STD_LOGIC_VECTOR(1 DOWNTO 0);
    VARIABLE sound: STD_LOGIC_VECTOR(1 DOWNTO 0);
    VARIABLE STOP: STD_LOGIC; 
    VARIABLE direction: STD_LOGIC;
    BEGIN
---------------7seg scan-------------------------------
	IF (f_HZ='1' AND F_HZ'EVENT) THEN
 IF ST(2 DOWNTO 0)= "101" THEN
   ST(2 DOWNTO 0):="000" ;
 ELSE ST(2 DOWNTO 0):=ST(2 DOWNTO 0)+1;
 END IF;
 END IF;
-----------------------------------------------
IF (OSC = '1' and OSC'EVENT) THEN
   	if a="1111" then 
	IF seq="11" then seq:="00" ;
    else seq:=seq+1;
	end if;
   	else seq:=seq;
    end if;

IF seq="00" then C(3 DOWNTO 0)<="1110" ;
elsif seq="01" then C(3 DOWNTO 0)<="1101" ;
elsif seq="10" then C(3 DOWNTO 0)<="1011" ;
elsif seq="11" then C(3 DOWNTO 0)<="0111" ;
end if;
end if;

IF A="1111" THEN INT:='0';
ELSE INT:='1'; 
END IF;


IF (HZ'EVENT AND HZ='1') THEN 
IF STOP='1' THEN UP:=UP+1;
ELSE UP:="000";
END IF;
END IF;

IF KEY='1' AND COUNT/=0 THEN 
  IF DIRECTION='0' THEN DRA<='1';DRB<='0';STOP:='0';
   ELSE DRA<='0';DRB<='1';STOP:='0';
  END IF;

 ELSIF KEY='1' AND COUNT=0 THEN STOP:='1';
 
 ELSIF STOP='1' AND UP<"110"  THEN DRA<=NOT DRA ;DRB<=NOT DRB;
 
ELSE  DRA<='0';DRB<='0';STOP:='0';



END IF;


iF  (OSC1'EVENT AND OSC1='1') THEN B:=(INT and (b and INT) );

----------------direction choice-----------------------
IF SW='0' AND B='1' AND Data(3 DOWNTO 0)="1010" THEN 
BCD(23 DOWNTO 0)<=BCD(23 DOWNTO 0);B:='0';direction:='1';

ELSIF SW='0' AND  B='1' AND Data(3 DOWNTO 0)="1011" THEN 
BCD(23 DOWNTO 0)<=BCD(23 DOWNTO 0);B:='0';direction:='0';
------------------KEY LOCK ON/OFF------------------------------------
ELSIF B='1' AND Data(3 DOWNTO 0)="1100" THEN 
BCD<=BCD;B:='0';SW<=NOT SW;
-------------------BACK-------------------------------
ELSIF SW='0' AND B='1' AND Data(3 DOWNTO 0)="1101" THEN 
BCD(23 DOWNTO 0)<=("0000" & bcd(23 downto 4) );B:='0';

-------------------CLEAR---------------------------------
ELSIF B='1' AND Data(3 DOWNTO 0)="1110" THEN 
BCD<="000000000000000000000000" ;B:='0';SW<='0';

------------------DOWNCOUNT  0 ------------------------------------
ELSIF BCD=0  AND  KEY='1' THEN SW<='0';KEY<='0';BCD<=BCD;
------------------------------------------------------------------

ELSIF SW='1' AND KEY='1' AND DATA(3 DOWNTO 0)/="1110" THEN BCD<=COUNT;
ELSIF SW='1' AND DATA(3 DOWNTO 0)="1110" THEN SW<='0';
BCD<="000000000000000000000000";KEY<='0';
-------------------ENTER------------------------------
ELSIF SW='0' AND B='1' AND Data(3 DOWNTO 0)="1111" AND BCD/=0 THEN 
B:='0';SW<='1';KEY<='1';

ELSIF SW='0' AND B='1' AND Data(3 DOWNTO 0)="1111" AND BCD=0 THEN 
BCD<=BCD;B:='0';SW<='0';KEY<='0';
----------------------NUMBER SHIFT---------------------------
ELSIF SW='0' AND B='1' THEN bcd(23 downto 0)<= bcd(19 downto 0) & DATA(3 DOWNTO 0);B:='0';
elsif INT='0' then bcd<=bcd;
b:='1';
END IF;
END IF;
------------------------------------------------------
SUM(1 DOWNTO 0)<= seq;
sum(4 downto 2)<=code;


---------------------SOUND-----------------------------
if (osc'event and osc='1') then 
if INT='1' AND SW='0' then sound:=sound+1;spo<=sound(1) ;
else spo<='0';
end if;
end if;
-------------------------------------------------------
---------------------------DOWNCOUNT--------------------
IF SW='0' THEN COUNT<=BCD;
ELSE

If (PULSE = '1' and PULSE'EVENT) THEN	
 

IF KEY='1' AND COUNT/=0 THEN  
----------------------------1---------------------------------------------------
  IF COUNT(3 DOWNTO 0)= 0 AND COUNT(23 DOWNTO 4)>=1 THEN
      COUNT(3 DOWNTO 0) <="1001" ;
  ELSE COUNT(3 DOWNTO 0) <= COUNT(3 DOWNTO 0)-1;
   
  END IF;
----------------------------2---------------------------------------------------------    
    IF  COUNT(7 DOWNTO 4)= 0 AND COUNT(23 DOWNTO 8)>=1  AND COUNT(3 DOWNTO 0)=0 THEN
	COUNT(7 DOWNTO 4) <= "1001" ;
	ELSIF COUNT(3 DOWNTO 0)=0 AND COUNT(23 DOWNTO 4)>=1  THEN
    COUNT(7 DOWNTO 4) <=COUNT(7 DOWNTO 4 )-1;
 END IF;
----------------------------3-------------------------------------------------------
	IF  COUNT(11 DOWNTO 8)= 0 AND COUNT(23 DOWNTO 12)>=1 AND COUNT(7 DOWNTO 0)=0 THEN
	COUNT(11 DOWNTO 8) <="1001";
	ELSIF COUNT(7 DOWNTO 0)=0 AND COUNT(23 DOWNTO 8)>=1 THEN 
    COUNT(11 DOWNTO 8) <=COUNT(11 DOWNTO 8 )-1;
END IF;
---------------------------4--------------------------------------------------------------
	IF  COUNT(15 DOWNTO 12)= 0 AND COUNT(23 DOWNTO 16)>=1 AND COUNT(11 DOWNTO 0)=0 THEN
	COUNT(15 DOWNTO 12) <="1001";
	ELSIF COUNT(11 DOWNTO 8)=0 AND COUNT(23 DOWNTO 12)>=1 AND COUNT(7 DOWNTO 0)=0 THEN
    COUNT(15 DOWNTO 12) <=COUNT(15 DOWNTO 12 )-1;
END IF;
-------------------------5------------------------------------------------------------
	IF  COUNT(19 DOWNTO 16)= 0 AND COUNT(23 DOWNTO 20)>=1 AND COUNT(15 DOWNTO 0)=0 THEN
	COUNT(19 DOWNTO 16) <="1001";
	ELSIF COUNT(15 DOWNTO 12)=0 AND COUNT(23 DOWNTO 16)>=1 AND COUNT(11 DOWNTO 0)=0 THEN
    COUNT(19 DOWNTO 16) <=COUNT(19 DOWNTO 16 )-1;
    
END IF;
-------------------------6-------------------------------------------------
	IF  COUNT(23 DOWNTO 20)= 0  THEN
	COUNT(23 DOWNTO 20) <="0000";
	ELSIF COUNT(19 DOWNTO 16)=0 AND COUNT(23 DOWNTO 20 )>=1 AND COUNT(15 DOWNTO 0)=0 THEN
    COUNT(23 DOWNTO 20) <=COUNT(23 DOWNTO 20 )-1;
    END IF;
END IF;

END IF;
END IF;




------------------7seg scan---------------------------
CASE ST IS 															--