top_vgatest_640x480.v

module top_vgatest_640x480
(
  input clk_25mhz,
  input [6:0] btn,
  output [7:0] led,
  output [3:0] gpdi_dp,
  input [12:9] gp_i,
  output wifi_gpio0
);

    // wifi_gpio0=1 keeps board from rebooting
    // hold btn0 to let ESP32 take control over the board
  assign wifi_gpio0 = btn[0];

  // clock generator
  wire clk_locked;
  wire [3:0] clocks;
  wire clk_pixel = clocks[1]; 
  wire clk_shift = clocks[2];
  wire clk_shift2 = clocks[0];

  wire clk = clocks[0];
  ecp5pll
  #(
    .in_hz(25*1000000),
    .out0_hz(250*1000000),
    .out1_hz(25*1000000),
    .out2_hz(175*1000000),
    .out2_deg(90)
  )
  ecp5pll_inst
  (
    .clk_i(gp_i[12]),
    .clk_o(clocks),
    .phasedir(btn[1]),
    .phasestep(btn[3]),
    .phaseloadreg(1'b0),
    .locked(clk_locked)
  );

    // LED blinky
    localparam counter_width = 28;
    wire [7:0] countblink;
    blink
    #(
      .bits(counter_width)
    )
    blink_instance
    (
      .clk(clk_pixel),
      .led(countblink)
    );
    assign led[6] = countblink[6];
    assign led[7] = clk_locked;

    // VGA signal generator
    wire [7:0] vga_r, vga_g, vga_b;
    wire vga_hsync, vga_vsync, vga_blank, vga_de;
    vga
    vga_instance
    (
      .clk_pixel(clk_pixel),
      .clk_pixel_ena(1'b1),
      .test_picture(1'b1), // enable test picture generation
      .vga_r(vga_r),
//      .vga_g(vga_g),
//      .vga_b(vga_b),
      .vga_hsync(vga_hsync),
//      .vga_vsync(vga_vsync),
      .vga_blank(vga_blank)
    );


    lvds2vga
    lvds2vga_instance
    (
      .clk_pixel(clk_pixel),
      .clk_shift(clk_shift),
      .lvds_i(gp_i[12:9]), // enable test picture generation
//      .r_o(vga_r[7:2]),
      .g_o(vga_g),
      .b_o(vga_b),
//      .hsync_o(vga_hsync),
      .vsync_o(vga_vsync),
//      .de_o(vga_de)
    );

    // VGA to digital video converter
    wire [1:0] tmds[3:0];
    vga2dvid
    #(
      .C_ddr(1'b0),
      .C_shift_clock_synchronizer(1'b1)
    )
    vga2dvid_instance
    (
      .clk_pixel(clk_pixel),
      .clk_shift(clk_shift2),
      .in_red(vga_r),
      .in_green(vga_g),
      .in_blue(vga_b),
      .in_hsync(vga_hsync),
      .in_vsync(vga_vsync),
      .in_blank(vga_blank),
      .out_clock(gpdi_dp[3]),
      .out_red(gpdi_dp[2]),
      .out_green(gpdi_dp[1]),
      .out_blue(gpdi_dp[0])
    );

endmodule