yayacemu/keyboard.sv

module keyboard (
    input  wire clk_in,
    output bit  keyboard[15:0]
);

  import "DPI-C" function bit [7:0] get_key();

  always_ff @(negedge clk_in) begin
    bit [7:0] keyval = get_key();
    if (&keyval != 1) begin
      keyboard[keyval[3:0]] = keyval[7];
    end
  end

endmodule