open and close door

Does it work?

The first section is doing well registering d input twice into q output but without obvious purpose.

The process underneath is a mystery. It can't be there.

What do you actually want the fpga to do with the door?

If you want simple logic control to open/close door and assuming you have one input called "ctrl" as a short pulse indicating close if open, open if close then:

PROCESS (clk)

BEGIN

IF rising_edge(clk) THEN

ctrl_d <= ctrl;

if ctrl /= ctrl_d then -- detect change by user

toggle <= not toggle;

end if;

q <= toggle; -- should settle as either 0 or 1

END IF;

END PROCESS;

to prevent the door being getting stuck in wrong state or bounce back dangerously then you need to define a reset state and debounce the ctrl input.