px=0
py=0
direction=-1

function _update()
    if not btn(direction) then
        direction=-1
    end

    for i=0,3 do
        if btnp(i) and (direction==i or direction==-1) then
            if i<=1 then
                px+=(i-0.5)*16
            else
                py+=(i-2.5)*16
            end
            direction=i
        end
    end
end

function _draw()
    cls()
    print("direction "..direction)
    print("x "..px..", y "..py)
end