spi_tb.v


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`timescale 1ns/1ps

module main;
  reg clk = 0;
  always #1 clk = ~clk;

  reg go = 0;
  reg rst = 1;
  reg [7:0] i_data = 8'hAA;
  wire [7:0] o_data;
  wire busy;

  wire spi_clk;
  wire spi_mosi;
  reg spi_miso = 0;

  spi_controller dut(
    .clk(clk), .rst(rst), .go(go /*& ~busy*/),
    .i_data(i_data), .o_data(o_data),
    .busy(busy),

    .spi_clk(spi_clk),
    .spi_mosi(spi_mosi),
    .spi_miso(spi_miso));

  initial begin
    $dumpfile("main.vcd");
    $dumpvars(2, main);

    //$display("Hello world!");
    //$monitor("T%03d | clk: %0d", $time, clk);

    #2 rst = 0;
       go = 1;
    #2 go = 0;

    #3 spi_miso = 1;
    #4 spi_miso = 0;
    #4 spi_miso = 1;
    #4 spi_miso = 0;
    #4 spi_miso = 1;
    #4 spi_miso = 0;
    #4 spi_miso = 1;
    #4 spi_miso = 0;
    #4 spi_miso = 1;
    #4 spi_miso = 0;
    #4 spi_miso = 1;

    #32 $finish;
  end

  initial begin
    #34 i_data = 8'h55;
        go = 1;
    #2  go = 0;
  end
endmodule