Up & Down Counter Using Push Buttons

Hi,

im trying to implement a counter that counts from 0 to 100 and vise versa. the counter must be controlled using 2 push buttons, one for incrementing and the other for decrementing for example, if 07 is displayed, pressing the increment button (push_button_1) should result in 08 being displayed or pressing the decrement button (push_button_2) should result in 06 being displayed. I tried implementing the counter using the code below (attached as well) but Quartus cannot compile it because apparently im using two distinctive clocks. Please guys, run the code n pls help me sort this problem out?

Regards

Dante

(i only used values 00 to 07 for testing purposes) isnt there a shorter way of implementing this? otherwise i have to write statements for each and every number till 100:confused:

LIBRARY IEEE;

USE IEEE.STD_LOGIC_1164.ALL;

USE IEEE.STD_LOGIC_ARITH.ALL;

USE IEEE.STD_LOGIC_UNSIGNED.ALL;

ENTITY BUTTON IS

PORT( PUSH_BUTTON_1 : IN STD_LOGIC;

PUSH_BUTTON_2 : IN STD_LOGIC;

MSD_driver : OUT STD_LOGIC_VECTOR(6 DOWNTO 0);

LSD_driver : OUT STD_LOGIC_VECTOR(6 DOWNTO 0));

END BUTTON;

----------------------------------------------------------------

ARCHITECTURE a OF BUTTON IS

SIGNAL PUSH_COUNTER1 :STD_LOGIC_VECTOR(2 DOWNTO 0):="000";

BEGIN

PROCESS(PUSH_BUTTON_1, PUSH_BUTTON_2)

BEGIN

IF (PUSH_BUTTON_1'EVENT AND PUSH_BUTTON_1 ='0') THEN

IF PUSH_COUNTER1 = "111" THEN

PUSH_COUNTER1 <= "111";

ELSE

PUSH_COUNTER1 <= PUSH_COUNTER1 + 1;

END IF;

ELSIF (PUSH_BUTTON_2'EVENT AND PUSH_BUTTON_2 ='0') THEN

IF PUSH_COUNTER1 = "000" THEN

PUSH_COUNTER1 <= "000";

ELSE

PUSH_COUNTER1 <= PUSH_COUNTER1 - 1;

END IF;

END IF;

END PROCESS;

PROCESS(PUSH_COUNTER1)

BEGIN

CASE PUSH_COUNTER1 IS

WHEN "000" => -- O=00

LSD_driver <= "1000000";

MSD_driver <= "1000000";

WHEN "001" => -- A=01

LSD_driver <= "1111001";

MSD_driver <= "1000000";

WHEN "010" => -- B=02

LSD_driver <= "0100100";

MSD_driver <= "1000000";

WHEN "011" => -- C=03

LSD_driver <= "0110000";

MSD_driver <= "1000000";

--

WHEN "100" => -- D=04

LSD_driver <= "0011001";

MSD_driver <= "1000000";

--

WHEN "101" => -- E=05

LSD_driver <= "0010010";

MSD_driver <= "1000000";

--

WHEN "110" => -- F=06

LSD_driver <= "0000010";

MSD_driver <= "1000000";

--

WHEN "111" => -- G=07

LSD_driver <= "1111000";

MSD_driver <= "1000000";

WHEN OTHERS => --23

LSD_driver <= null; --2

MSD_driver <= null; --3

END CASE;

END PROCESS;

END a;