diff options
Diffstat (limited to 'basys3/basys3.srcs/ppu_vga_native.vhd')
| -rw-r--r-- | basys3/basys3.srcs/ppu_vga_native.vhd | 109 |
1 files changed, 56 insertions, 53 deletions
diff --git a/basys3/basys3.srcs/ppu_vga_native.vhd b/basys3/basys3.srcs/ppu_vga_native.vhd index b337786..f5d9809 100644 --- a/basys3/basys3.srcs/ppu_vga_native.vhd +++ b/basys3/basys3.srcs/ppu_vga_native.vhd @@ -50,6 +50,7 @@ architecture Behavioral of ppu_vga_native is signal ram_x1: line_buffer; -- buffer 1 signal hcount: STD_LOGIC_VECTOR(9 downto 0):= (others => '0'); signal vcount: STD_LOGIC_VECTOR(9 downto 0):= (others => '0'); + signal clkCounter: STD_LOGIC_VECTOR(1 downto 0):= (others => '0'); signal rgb_out : STD_LOGIC_VECTOR(11 downto 0):= (others => '0'); -- output colors signal px : integer; -- conversion for hcount signal py :integer; -- conversion for vcount @@ -60,63 +61,65 @@ begin variable v_x : integer ; -- integer to hold vector X begin if rising_edge(clk) then - - v_x := TO_INTEGER(unsigned(x) - 72); - if(v_x >= 0 and v_x < 320 and PREADY = '1') then - if(y(0) = '0') then - ram_x0(v_x) <= RI & GI & BI; - if v_x = 319 then - bufferFilledOnbuffer0 <= TO_INTEGER(unsigned(y) - 14); - end if; - else - ram_x1(v_x) <= RI & GI & BI; - if v_x = 319 then - bufferFilledOnbuffer1 <= TO_INTEGER(unsigned(y) - 14); + clkCounter <= clkCounter + 1; + if(clkCounter = "11")then + v_x := TO_INTEGER(unsigned(x) - 72); + if(v_x >= 0 and v_x < 320 and PREADY = '1') then + if(y(0) = '0') then + ram_x0(v_x) <= RI & GI & BI; + if v_x = 319 then + bufferFilledOnbuffer0 <= TO_INTEGER(unsigned(y) - 14); + end if; + else + ram_x1(v_x) <= RI & GI & BI; + if v_x = 319 then + bufferFilledOnbuffer1 <= TO_INTEGER(unsigned(y) - 14); + end if; + end if; + end if; + -- T display(display data) + if (hcount >= 144) and (hcount < 784) and (vcount >= 31) and (vcount < 511) then + px <= TO_INTEGER(unsigned(hcount) - 144); + py <= TO_INTEGER(unsigned(vcount) - 31); + if(bufferFilledonBuffer0 = (py/2)) then + rgb_out <= ram_x0(px/2); + elsif(bufferFilledonbuffer1 = (py/2)) then + rgb_out <= ram_x1(px/2); + + else + rgb_out <= (others => '0'); + end if; - end if; - end if; - -- T display(display data) - if (hcount >= 144) and (hcount < 784) and (vcount >= 31) and (vcount < 511) then - px <= TO_INTEGER(unsigned(hcount) - 144); - py <= TO_INTEGER(unsigned(vcount) - 31); - if(bufferFilledonBuffer0 = (py/2)) then - rgb_out <= ram_x0(px/2); - elsif(bufferFilledonbuffer1 = (py/2)) then - rgb_out <= ram_x1(px/2); - - else - rgb_out <= (others => '0'); - + end if; + -- pulse width + hsync <= '1'; + if hcount < 97 then + hsync <= '0'; + end if; + + vsync <= '1'; + if vcount < 3 then + vsync <= '0'; + end if; + + -- sync pulse time + hcount <= hcount + 1; + + if hcount = 800 then + vcount <= vcount + 1; + hcount <= (others => '0'); + end if; + + if vcount = 521 then + vcount <= (others => '0'); end if; end if; - -- pulse width - hsync <= '1'; - if hcount < 97 then - hsync <= '0'; - end if; - - vsync <= '1'; - if vcount < 3 then - vsync <= '0'; - end if; - - -- sync pulse time - hcount <= hcount + 1; - - if hcount = 800 then - vcount <= vcount + 1; - hcount <= (others => '0'); - end if; - - if vcount = 521 then - vcount <= (others => '0'); - end if; - + + -- output colors + RO <= rgb_out(11 downto 8); + GO <= rgb_out(7 downto 4); + BO <= rgb_out(3 downto 0); end if; - -- output colors - RO <= rgb_out(11 downto 8); - GO <= rgb_out(7 downto 4); - BO <= rgb_out(3 downto 0); end process; end Behavioral; |