aboutsummaryrefslogtreecommitdiff
path: root/basys3/basys3.srcs/ppu_vga_tiny.vhd
diff options
context:
space:
mode:
authorlonkaars <loek@pipeframe.xyz>2023-02-24 12:15:32 +0100
committerlonkaars <loek@pipeframe.xyz>2023-02-24 12:15:32 +0100
commitfd4732181317907d51be645f75d138c2176a8e3b (patch)
tree925fc3a51912d946bec843fe5342e8cac9535e6e /basys3/basys3.srcs/ppu_vga_tiny.vhd
parente7fbeb1a6071db070c4c2b21c4c5ed70d53e269b (diff)
parentb2190241fccdfbf28d6068c9f0d2179aec285528 (diff)
merge #16
Diffstat (limited to 'basys3/basys3.srcs/ppu_vga_tiny.vhd')
-rw-r--r--basys3/basys3.srcs/ppu_vga_tiny.vhd103
1 files changed, 103 insertions, 0 deletions
diff --git a/basys3/basys3.srcs/ppu_vga_tiny.vhd b/basys3/basys3.srcs/ppu_vga_tiny.vhd
new file mode 100644
index 0000000..f47df48
--- /dev/null
+++ b/basys3/basys3.srcs/ppu_vga_tiny.vhd
@@ -0,0 +1,103 @@
+----------------------------------------------------------------------------------
+-- Company:
+-- Engineer:
+--
+-- Create Date: 22.02.2023 13:13:03
+-- Design Name:
+-- Module Name: ppu_vga_tiny - Behavioral
+-- Project Name:
+-- Target Devices:
+-- Tool Versions:
+-- Description:
+--
+-- Dependencies:
+--
+-- Revision:
+-- Revision 0.01 - File Created
+-- Additional Comments:
+--
+----------------------------------------------------------------------------------
+
+
+library IEEE;
+use IEEE.STD_LOGIC_1164.ALL;
+use work.ppu_consts.all;
+
+use IEEE.NUMERIC_STD.ALL;
+use IEEE.STD_LOGIC_UNSIGNED.ALL;
+-- Uncomment the following library declaration if instantiating
+-- any Xilinx leaf cells in this code.
+--library UNISIM;
+--use UNISIM.VComponents.all;
+
+entity ppu_vga_tiny is
+ Port (
+ CLK: in std_logic; -- system clock
+ RESET: in std_logic;
+
+ X: out std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
+ Y: out std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
+
+ VSYNC, VBLANK,
+ HSYNC, HBLANK: out std_logic); -- VGA sync outputs
+
+end ppu_vga_tiny;
+
+architecture Behavioral of ppu_vga_tiny is
+ signal hcount: STD_LOGIC_VECTOR(PPU_POS_H_WIDTH-1 downto 0):= (others => '0');
+ signal vcount: STD_LOGIC_VECTOR(PPU_POS_V_WIDTH-1 downto 0):= (others => '0');
+ signal CLKcounter: STD_LOGIC_VECTOR(4 downto 0):= (others => '0');
+
+begin
+process (CLK)
+begin
+ if rising_edge(CLK) then
+ CLKcounter <= CLKcounter + 1;
+ if(CLKcounter > 15) then
+ clkCounter <= (others => '0');
+ -- x,y data uit
+ X <= hcount;
+ Y <= vcount;
+
+ --pulse width
+ if hcount < 32 or hcount >= 320-80 then
+ hsync <= '0';
+ else
+ hsync <= '1';
+ end if;
+
+ if vcount < 8 or vcount >= 240-15 then
+ vsync <= '0';
+ else
+ vsync <= '1';
+ end if;
+
+ -- Hblank and Vblank outputs
+ if hcount >= 320-80 then
+ hblank <= '1';
+ else
+ hblank <= '0';
+ end if;
+
+ if vcount >= 240-15 then
+ vblank <= '1';
+ else
+ vblank <= '0';
+ end if;
+
+ -- sync pulse time
+ hcount <= hcount + 1;
+
+ if hcount = 400 then
+ vcount <= vcount + 1;
+ hcount <= (others => '0');
+ end if;
+
+ if vcount = 255 then
+ vcount <= (others => '0');
+ end if;
+ end if;
+ end if;
+end process;
+
+end Behavioral;