get vpos and hpos out vsync and hsync

Question

For a project i got a screen with a resolution of 1024*600. For the project i need a squarre of 20px *20px with a red color. Im trying to get my verticale pos en horizontale pos out of the hsync en vsync pulse but this doesn't work. Have anyone a solution?

process(int_hsync, int_vsync)
begin
 if Rising_Edge(int_vsync) then
    vsync <= 0;
 elsif Rising_Edge(in_clk) then
    vsync <= vsync+1;
 end if;
 if Rising_Edge(int_hsync) then
    hsync <= 0;
 elsif Rising_Edge(in_clk) then
    hsync <= hsync+1;
 end if;
end process;

process(in_clk)
begin
    if Rising_Edge(in_clk) then
        if hsync < 20 and vsync <20 then
            int_pixel   <= X"0000ff";
        else
            int_pixel   <= X"ff0000";
        end if;
    end if;
end process;

Answer 1

Without some additional details it is very difficult to tell what you are trying to do.

However, I did notice that your process is only sensitive to int_hsync and int_vsync, yet you are looking for a rising_edge of in_clk. You should do an edge detect similar to this, instead (assuming that in_clk is much faster than hsync and vsync):

process(in_clk)
begin
  if rising_edge(in_clk) then
     int_vsync_dly <= int_vsync;
     int_hsync_dly <= int_hsync;
     if int_vsync = '1' and int_vsync_dly = '0' then -- rising edge detect
        vsync <= 0;
     else
        vsync <= vsync+1;
     end if;

     if int_hsync = '1' and int_hsync_dly = '0' then -- rising edge detect
        hsync <= 0;
     else
        hsync <= hsync+1;
     end if;
  end if;
end process;

This increments vsync and hsync counters every time a rising edge of the respective trigger signals is observed. Do make sure that the inputs are properly registered before the edge detection to help avoid meta-stable cases.