8/3/2019 Code for Vending Machine

http://slidepdf.com/reader/full/code-for-vending-machine 1/2

8/3/2019 Code for Vending Machine

http://slidepdf.com/reader/full/code-for-vending-machine 2/2

WHEN st15 =>

candy_out <= '0';

nickel_out <='0';dime_out <= '0';

IF (nickel_in) THEN next_state <= st20;ELSIF (dime_in) THEN next_state <= st25;

ELSIF (quarter_in) THEN next_state <=st40;

ELSE next_state <=st15;

END IF;

WHEN st20 =>candy_out <= '0';

nickel_out <='0';dime_out <= '0';

IF (nickel_in) THEN next_state <= st25;

ELSIF (dime_in) THEN next_state <= st30;

ELSIF (quarter_in) THEN next_state <=st45;

ELSE next_state <=st20;END IF;

WHEN st25 =>candy_out <= '1';

nickel_out <='0';

dime_out <= '0';

next_state <= st0;WHEN st30 =>

candy_out <= '1';nickel_out <='1';

dime_out <= '0';

next_state <= st0;

WHEN st35 =>candy_out <= '1';

nickel_out <='0';dime_out <= '1';

next_state <= st35;WHEN st45 =>

candy_out <= '0';

nickel_out <='0';

dime_out <= '1';next_state <= st35;

END CASE;END PROCESS;

END fsm;