请问如何通过FPGA驱动VGA显示一个圆形
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利用圆的方程X^2+Y^2<=z^2.x是行扫描计数值与圆心的差，y是列扫描与圆心的差。这是你要的圆的半径。我给你贴一段程序，我自己写的12个圆环，分了四个象限，比较蠢。不分象限的话要用无符号数。
library ieee;use ieee.std_logic_1164.all;use ieee.std_logic_unsigned.all;entity vga_block isport (clk_40mhz:in std_logic; forming:in integer range 0 to 3; coulour:in integer range 0 to 2; h_or_f:in integer range 0 to 1;vga_out:out std_logic_vector(2 downto 0);hs1,vs1:out std_logic);end;architecture behave of vga_block issignal counter_hs:integer range 0 to 1055; --屏幕中行信号 HS 使用范围signal counter_vs:integer range 0 to 627; --屏幕中场信号 VS 使用范围signal hs,vs:std_logic:='1'; --行信号 hs 和场信号 vs 高电平signal rgb1,rgb2,rgb3:std_logic_vector(2 downto 0); --水平和垂直方向上表示 3 基色的中间变量signal coulour1,coulour2: std_logic_vector(2 downto 0);beginprocess(clk_40mhz) --40MHZ 触发在每行上逐点扫描beginif rising_edge(clk_40mhz) then if counter_hs>=1055 then counter_hs<=0;else counter_hs<=counter_hs+1;end if;end if;end process;process(counter_hs) --行消隐beginif counter_hs>=0 and counter_hs<128 thenhs<='0';elsehs<='1';end if;end process;process(hs)beginif falling_edge(hs) then --VGA 中行同步负脉冲有效if counter_vs>=627 thencounter_vs<=0;else counter_vs<=counter_vs+1; --垂直扫描end if;end if;end process;process(counter_vs) --场消隐beginif counter_vs>=0 and counter_vs<=3 thenvs<='0';elsevs<='1';end if;end process;
process(counter_hs,counter_vs）
if (counter_hs >=216 and counter_hs <=616) then if (counter_vs >=27 and counter_vs <=327) then if (((327-counter_vs)**2+(616-counter_hs)**2) <=90000 and ((327-counter_vs)**2+(616-counter_hs)**2) >=75625)or(((327-counter_vs)**2+(616-counter_hs)**2) < 62500 and ((327-counter_vs)**2+(616-counter_hs)**2) >=50625)or(((327-counter_vs)**2+(616-counter_hs)**2) < 40000 and ((327-counter_vs)**2+(616-counter_hs)**2) >=30625)or(((327-counter_vs)**2+(616-counter_hs)**2) < 22500 and ((327-counter_vs)**2+(616-counter_hs)**2) >=15625)or(((327-counter_vs)**2+(616-counter_hs)**2) < 10000 and ((327-counter_vs)**2+(616-counter_hs)**2) >=5625)or(((327-counter_vs)**2+(616-counter_hs)**2) < 2500 and ((327-counter_vs)**2+(616-counter_hs)**2) >=625) then rgb1 <=coulour1; elsif (((327-counter_vs)**2+(616-counter_hs)**2) < 75625 and ((327-counter_vs)**2+(616-counter_hs)**2) >=62500)or(((327-counter_vs)**2+(616-counter_hs)**2) < 50625 and ((327-counter_vs)**2+(616-counter_hs)**2) >=40000)or(((327-counter_vs)**2+(616-counter_hs)**2) < 30625 and ((327-counter_vs)**2+(616-counter_hs)**2) >=22500)or(((327-counter_vs)**2+(616-counter_hs)**2) < 15625 and ((327-counter_vs)**2+(616-counter_hs)**2) >=10000)or(((327-counter_vs)**2+(616-counter_hs)**2) < 5625 and ((327-counter_vs)**2+(616-counter_hs)**2) >=2500)or(((327-counter_vs)**2+(616-counter_hs)**2) < 625 and ((327-counter_vs)**2+(616-counter_hs)**2) >=0) then rgb1 <=coulour2;else rgb1 <="000";end if; elsif (counter_vs >=327 and counter_vs <=627) then if (((counter_vs-327)**2+(616-counter_hs)**2) <=90000 and ((counter_vs-327)**2+(616-counter_hs)**2) >=75625)or(((counter_vs-327)**2+(616-counter_hs)**2) < 62500 and ((counter_vs-327)**2+(616-counter_hs)**2) >=50625)or(((counter_vs-327)**2+(616-counter_hs)**2) < 40000 and ((counter_vs-327)**2+(616-counter_hs)**2) >=30625)or(((counter_vs-327)**2+(616-counter_hs)**2) < 22500 and ((counter_vs-327)**2+(616-counter_hs)**2) >=15625)or(((counter_vs-327)**2+(616-counter_hs)**2) < 10000 and ((counter_vs-327)**2+(616-counter_hs)**2) >=5625)or(((counter_vs-327)**2+(616-counter_hs)**2) < 2500 and ((counter_vs-327)**2+(616-counter_hs)**2) >=625) then rgb1 <=coulour1; elsif (((counter_vs-327)**2+(616-counter_hs)**2) < 75625 and ((counter_vs-327)**2+(616-counter_hs)**2) >=62500)or(((counter_vs-327)**2+(616-counter_hs)**2) < 50625 and ((counter_vs-327)**2+(616-counter_hs)**2) >=40000)or(((counter_vs-327)**2+(616-counter_hs)**2) < 30625 and ((counter_vs-327)**2+(616-counter_hs)**2) >=22500)or(((counter_vs-327)**2+(616-counter_hs)**2) < 15625 and ((counter_vs-327)**2+(616-counter_hs)**2) >=10000)or(((counter_vs-327)**2+(616-counter_hs)**2) < 5625 and ((counter_vs-327)**2+(616-counter_hs)**2) >=2500)or(((counter_vs-327)**2+(616-counter_hs)**2) < 625 and ((counter_vs-327)**2+(616-counter_hs)**2) >=0) then rgb1 <=coulour2;else rgb1 <="000";end if; end if; elsif (counter_hs >=616 and counter_hs <=1016) then if (counter_vs >=27 and counter_vs <=327) then if (((327-counter_vs)**2+(counter_hs-616)**2) <=90000 and ((327-counter_vs)**2+(counter_hs-616)**2) >=75625)or(((327-counter_vs)**2+(counter_hs-616)**2) < 62500 and ((327-counter_vs)**2+(counter_hs-616)**2) >=50625)or(((327-counter_vs)**2+(counter_hs-616)**2) < 40000 and ((327-counter_vs)**2+(counter_hs-616)**2) >=30625)or(((327-counter_vs)**2+(counter_hs-616)**2) < 22500 and ((327-counter_vs)**2+(counter_hs-616)**2) >=15625)or(((327-counter_vs)**2+(counter_hs-616)**2) < 10000 and ((327-counter_vs)**2+(counter_hs-616)**2) >=5625)or(((327-counter_vs)**2+(counter_hs-616)**2) < 2500 and ((327-counter_vs)**2+(counter_hs-616)**2) >=625) then rgb1 <=coulour1; elsif (((327-counter_vs)**2+(counter_hs-616)**2) < 75625 and ((327-counter_vs)**2+(counter_hs-616)**2) >=62500)or(((327-counter_vs)**2+(counter_hs-616)**2) < 50625 and ((327-counter_vs)**2+(counter_hs-616)**2) >=40000)or(((327-counter_vs)**2+(counter_hs-616)**2) < 30625 and ((327-counter_vs)**2+(counter_hs-616)**2) >=22500)or(((327-counter_vs)**2+(counter_hs-616)**2) < 15625 and ((327-counter_vs)**2+(counter_hs-616)**2) >=10000)or(((327-counter_vs)**2+(counter_hs-616)**2) < 5625 and ((327-counter_vs)**2+(counter_hs-616)**2) >=2500)or(((327-counter_vs)**2+(counter_hs-616)**2) < 625 and ((327-counter_vs)**2+(counter_hs-616)**2) >=0) then rgb1 <=coulour2;else rgb1 <="000";end if; elsif (counter_vs >=327 and counter_vs <=627) then if (((counter_vs-327)**2+(counter_hs-616)**2) <=90000 and ((counter_vs-327)**2+(counter_hs-616)**2) >=75625)or(((counter_vs-327)**2+(counter_hs-616)**2) < 62500 and ((counter_vs-327)**2+(counter_hs-616)**2) >=50625)or(((counter_vs-327)**2+(counter_hs-616)**2) < 40000 and ((counter_vs-327)**2+(counter_hs-616)**2) >=30625)or(((counter_vs-327)**2+(counter_hs-616)**2) < 22500 and ((counter_vs-327)**2+(counter_hs-616)**2) >=15625)or(((counter_vs-327)**2+(counter_hs-616)**2) < 10000 and ((counter_vs-327)**2+(counter_hs-616)**2) >=5625)or(((counter_vs-327)**2+(counter_hs-616)**2) < 2500 and ((counter_vs-327)**2+(counter_hs-616)**2) >=625) then rgb1 <=coulour1; elsif (((counter_vs-327)**2+(counter_hs-616)**2) < 75625 and ((counter_vs-327)**2+(counter_hs-616)**2) >=62500)or(((counter_vs-327)**2+(counter_hs-616)**2) < 50625 and ((counter_vs-327)**2+(counter_hs-616)**2) >=40000)or(((counter_vs-327)**2+(counter_hs-616)**2) < 30625 and ((counter_vs-327)**2+(counter_hs-616)**2) >=22500)or(((counter_vs-327)**2+(counter_hs-616)**2) < 15625 and ((counter_vs-327)**2+(counter_hs-616)**2) >=10000)or(((counter_vs-327)**2+(counter_hs-616)**2) < 5625 and ((counter_vs-327)**2+(counter_hs-616)**2) >=2500)or(((counter_vs-327)**2+(counter_hs-616)**2) < 625 and ((counter_vs-327)**2+(counter_hs-616)**2) >=0) then rgb1 <=coulour2;else rgb1 <="000";end if; end if; end if;--圆环
hs1 <= hs;vs1 <= vs;Vga_out<=rgb1 end process;end;
library ieee;use ieee.std_logic_1164.all;use ieee.std_logic_unsigned.all;entity vga_block isport (clk_40mhz:in std_logic; forming:in integer range 0 to 3; coulour:in integer range 0 to 2; h_or_f:in integer range 0 to 1;vga_out:out std_logic_vector(2 downto 0);hs1,vs1:out std_logic);end;architecture behave of vga_block issignal counter_hs:integer range 0 to 1055; --屏幕中行信号 HS 使用范围signal counter_vs:integer range 0 to 627; --屏幕中场信号 VS 使用范围signal hs,vs:std_logic:='1'; --行信号 hs 和场信号 vs 高电平signal rgb1,rgb2,rgb3:std_logic_vector(2 downto 0); --水平和垂直方向上表示 3 基色的中间变量signal coulour1,coulour2: std_logic_vector(2 downto 0);beginprocess(clk_40mhz) --40MHZ 触发在每行上逐点扫描beginif rising_edge(clk_40mhz) then if counter_hs>=1055 then counter_hs<=0;else counter_hs<=counter_hs+1;end if;end if;end process;process(counter_hs) --行消隐beginif counter_hs>=0 and counter_hs<128 thenhs<='0';elsehs<='1';end if;end process;process(hs)beginif falling_edge(hs) then --VGA 中行同步负脉冲有效if counter_vs>=627 thencounter_vs<=0;else counter_vs<=counter_vs+1; --垂直扫描end if;end if;end process;process(counter_vs) --场消隐beginif counter_vs>=0 and counter_vs<=3 thenvs<='0';elsevs<='1';end if;end process;
process(counter_hs,counter_vs）
if (counter_hs >=216 and counter_hs <=616) then if (counter_vs >=27 and counter_vs <=327) then if (((327-counter_vs)**2+(616-counter_hs)**2) <=90000 and ((327-counter_vs)**2+(616-counter_hs)**2) >=75625)or(((327-counter_vs)**2+(616-counter_hs)**2) < 62500 and ((327-counter_vs)**2+(616-counter_hs)**2) >=50625)or(((327-counter_vs)**2+(616-counter_hs)**2) < 40000 and ((327-counter_vs)**2+(616-counter_hs)**2) >=30625)or(((327-counter_vs)**2+(616-counter_hs)**2) < 22500 and ((327-counter_vs)**2+(616-counter_hs)**2) >=15625)or(((327-counter_vs)**2+(616-counter_hs)**2) < 10000 and ((327-counter_vs)**2+(616-counter_hs)**2) >=5625)or(((327-counter_vs)**2+(616-counter_hs)**2) < 2500 and ((327-counter_vs)**2+(616-counter_hs)**2) >=625) then rgb1 <=coulour1; elsif (((327-counter_vs)**2+(616-counter_hs)**2) < 75625 and ((327-counter_vs)**2+(616-counter_hs)**2) >=62500)or(((327-counter_vs)**2+(616-counter_hs)**2) < 50625 and ((327-counter_vs)**2+(616-counter_hs)**2) >=40000)or(((327-counter_vs)**2+(616-counter_hs)**2) < 30625 and ((327-counter_vs)**2+(616-counter_hs)**2) >=22500)or(((327-counter_vs)**2+(616-counter_hs)**2) < 15625 and ((327-counter_vs)**2+(616-counter_hs)**2) >=10000)or(((327-counter_vs)**2+(616-counter_hs)**2) < 5625 and ((327-counter_vs)**2+(616-counter_hs)**2) >=2500)or(((327-counter_vs)**2+(616-counter_hs)**2) < 625 and ((327-counter_vs)**2+(616-counter_hs)**2) >=0) then rgb1 <=coulour2;else rgb1 <="000";end if; elsif (counter_vs >=327 and counter_vs <=627) then if (((counter_vs-327)**2+(616-counter_hs)**2) <=90000 and ((counter_vs-327)**2+(616-counter_hs)**2) >=75625)or(((counter_vs-327)**2+(616-counter_hs)**2) < 62500 and ((counter_vs-327)**2+(616-counter_hs)**2) >=50625)or(((counter_vs-327)**2+(616-counter_hs)**2) < 40000 and ((counter_vs-327)**2+(616-counter_hs)**2) >=30625)or(((counter_vs-327)**2+(616-counter_hs)**2) < 22500 and ((counter_vs-327)**2+(616-counter_hs)**2) >=15625)or(((counter_vs-327)**2+(616-counter_hs)**2) < 10000 and ((counter_vs-327)**2+(616-counter_hs)**2) >=5625)or(((counter_vs-327)**2+(616-counter_hs)**2) < 2500 and ((counter_vs-327)**2+(616-counter_hs)**2) >=625) then rgb1 <=coulour1; elsif (((counter_vs-327)**2+(616-counter_hs)**2) < 75625 and ((counter_vs-327)**2+(616-counter_hs)**2) >=62500)or(((counter_vs-327)**2+(616-counter_hs)**2) < 50625 and ((counter_vs-327)**2+(616-counter_hs)**2) >=40000)or(((counter_vs-327)**2+(616-counter_hs)**2) < 30625 and ((counter_vs-327)**2+(616-counter_hs)**2) >=22500)or(((counter_vs-327)**2+(616-counter_hs)**2) < 15625 and ((counter_vs-327)**2+(616-counter_hs)**2) >=10000)or(((counter_vs-327)**2+(616-counter_hs)**2) < 5625 and ((counter_vs-327)**2+(616-counter_hs)**2) >=2500)or(((counter_vs-327)**2+(616-counter_hs)**2) < 625 and ((counter_vs-327)**2+(616-counter_hs)**2) >=0) then rgb1 <=coulour2;else rgb1 <="000";end if; end if; elsif (counter_hs >=616 and counter_hs <=1016) then if (counter_vs >=27 and counter_vs <=327) then if (((327-counter_vs)**2+(counter_hs-616)**2) <=90000 and ((327-counter_vs)**2+(counter_hs-616)**2) >=75625)or(((327-counter_vs)**2+(counter_hs-616)**2) < 62500 and ((327-counter_vs)**2+(counter_hs-616)**2) >=50625)or(((327-counter_vs)**2+(counter_hs-616)**2) < 40000 and ((327-counter_vs)**2+(counter_hs-616)**2) >=30625)or(((327-counter_vs)**2+(counter_hs-616)**2) < 22500 and ((327-counter_vs)**2+(counter_hs-616)**2) >=15625)or(((327-counter_vs)**2+(counter_hs-616)**2) < 10000 and ((327-counter_vs)**2+(counter_hs-616)**2) >=5625)or(((327-counter_vs)**2+(counter_hs-616)**2) < 2500 and ((327-counter_vs)**2+(counter_hs-616)**2) >=625) then rgb1 <=coulour1; elsif (((327-counter_vs)**2+(counter_hs-616)**2) < 75625 and ((327-counter_vs)**2+(counter_hs-616)**2) >=62500)or(((327-counter_vs)**2+(counter_hs-616)**2) < 50625 and ((327-counter_vs)**2+(counter_hs-616)**2) >=40000)or(((327-counter_vs)**2+(counter_hs-616)**2) < 30625 and ((327-counter_vs)**2+(counter_hs-616)**2) >=22500)or(((327-counter_vs)**2+(counter_hs-616)**2) < 15625 and ((327-counter_vs)**2+(counter_hs-616)**2) >=10000)or(((327-counter_vs)**2+(counter_hs-616)**2) < 5625 and ((327-counter_vs)**2+(counter_hs-616)**2) >=2500)or(((327-counter_vs)**2+(counter_hs-616)**2) < 625 and ((327-counter_vs)**2+(counter_hs-616)**2) >=0) then rgb1 <=coulour2;else rgb1 <="000";end if; elsif (counter_vs >=327 and counter_vs <=627) then if (((counter_vs-327)**2+(counter_hs-616)**2) <=90000 and ((counter_vs-327)**2+(counter_hs-616)**2) >=75625)or(((counter_vs-327)**2+(counter_hs-616)**2) < 62500 and ((counter_vs-327)**2+(counter_hs-616)**2) >=50625)or(((counter_vs-327)**2+(counter_hs-616)**2) < 40000 and ((counter_vs-327)**2+(counter_hs-616)**2) >=30625)or(((counter_vs-327)**2+(counter_hs-616)**2) < 22500 and ((counter_vs-327)**2+(counter_hs-616)**2) >=15625)or(((counter_vs-327)**2+(counter_hs-616)**2) < 10000 and ((counter_vs-327)**2+(counter_hs-616)**2) >=5625)or(((counter_vs-327)**2+(counter_hs-616)**2) < 2500 and ((counter_vs-327)**2+(counter_hs-616)**2) >=625) then rgb1 <=coulour1; elsif (((counter_vs-327)**2+(counter_hs-616)**2) < 75625 and ((counter_vs-327)**2+(counter_hs-616)**2) >=62500)or(((counter_vs-327)**2+(counter_hs-616)**2) < 50625 and ((counter_vs-327)**2+(counter_hs-616)**2) >=40000)or(((counter_vs-327)**2+(counter_hs-616)**2) < 30625 and ((counter_vs-327)**2+(counter_hs-616)**2) >=22500)or(((counter_vs-327)**2+(counter_hs-616)**2) < 15625 and ((counter_vs-327)**2+(counter_hs-616)**2) >=10000)or(((counter_vs-327)**2+(counter_hs-616)**2) < 5625 and ((counter_vs-327)**2+(counter_hs-616)**2) >=2500)or(((counter_vs-327)**2+(counter_hs-616)**2) < 625 and ((counter_vs-327)**2+(counter_hs-616)**2) >=0) then rgb1 <=coulour2;else rgb1 <="000";end if; end if; end if;--圆环
hs1 <= hs;vs1 <= vs;Vga_out<=rgb1 end process;end;
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VGA显示器是模拟的三基色输入，所以用FPGA驱动的话，首先要三个D/A转换器，当然如果只是显示一个圆形，FPGA用I/O口外搞几个电阻也是可以实现显示一个只有几种颜色的圆形。不知道你的具体要求，如果有实验箱什么的，一般上面应该有D/A转换器，而且有VGA接口，只要正确驱动就可以了。那你再具体描述一下你的要求？
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