ISim Dreiecks- und Sinussignal

-- Dreieckszähler

  pwm_triangle : process (clk_33mhz)

    variable triangle_counter  : integer;

    variable counter_max      : integer := 10;

    variable  dir          : std_logic;

  begin  

    if (clk_33mhz'event and clk_33mhz = '1') then

      if (rst='1') then

        triangle_counter       := 0;

      else

          if (dir = '0') then

            --aufwärts zählen

            if (triangle_counter < (counter_max-1)) then

              triangle_counter := (triangle_counter + 1);

            else

              dir := '1';

              triangle_counter := (triangle_counter - 1);

            end if;

          else 

          --abwärts zählen

            if (triangle_counter > 0) then

              triangle_counter := (triangle_counter - 1);

            else

              dir := '0'; 

              triangle_counter := (triangle_counter + 1);

            end if;

          end if;

          zaehler <= triangle_counter;   

      end if;

    end if;    

  end process;