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PODraw circle vhdl
 

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    <p>How I can draw circle in VHDL? There is <a href="http://oi48.tinypic.com/o7kfts.jpg" rel="nofollow">my BDF design</a></p> <p>Sow, I need to draw red circle ~ 100 px radius. I think I should use some vector, but how?</p> <pre><code>entity VGAFrameTest is port( yrow, xcolumn : in unsigned(9 downto 0); -- row and column number of VGA video VGA_CLK : in std_logic; -- pixel clock VGA_R, VGA_G, VGA_B: out std_logic_vector(9 downto 0)); -- color information end; architecture rtl of VGAFrameTest is constant COLOR_ON : std_logic_vector(9 downto 0) := (others=&gt;'1'); constant COLOR_OFF : std_logic_vector(9 downto 0) := (others=&gt;'0'); constant ROW_HEIGHT : integer := 480; -- number of visible rows </code></pre> <blockquote> <pre><code>-- A test of visible range is recommended -- VGA 640x480@60Hz resolution is not natural for LCD monitors -- They support it but some monitors do not display all columns -- 1 or 2 last columns can be missing </code></pre> </blockquote> <pre><code>constant COLUMN_WIDTH : integer := 640 -1 ; -- number of visible columns - correction begin frame:process(VGA_CLK) begin if rising_edge(VGA_CLK) then VGA_R&lt;=COLOR_ON;VGA_G&lt;=COLOR_ON;VGA_B&lt;=COLOR_ON; --initilize color to white if (yrow = 240 and xcolumn = 320) then VGA_B&lt;=COLOR_OFF; VGA_G&lt;=COLOR_OFF; elsif yrow = 1 or yrow = ROW_HEIGHT-2 or xcolumn=1 or xcolumn = COLUMN_WIDTH-2 then VGA_R&lt;=COLOR_OFF; VGA_G&lt;=COLOR_OFF; VGA_B&lt;=COLOR_OFF; -- black frame elsif yrow = ROW_HEIGHT-1 then VGA_B&lt;=COLOR_OFF; VGA_G&lt;=COLOR_OFF; --last column is red end if; end if; end process; end; </code></pre>
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