// SPDX-FileCopyrightText: 2020 Efabless Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// SPDX-License-Identifier: Apache-2.0

`default_nettype none

`timescale 1 ns / 1 ps

module testbench;
  reg clock;
  wire clock_wire = clock;
  reg RSTB;
  reg CSB;

  reg power1, power2;

  wire gpio;
  wire [37:0] mprj_io;

`ifdef PULLUP_IO
  genvar gen_i;
  generate
    for (gen_i = 0; gen_i < 38; gen_i = gen_i + 1) begin
      pullup(mprj_io[gen_i]);
    end
  endgenerate
`endif

  always #12.5 clock <= (clock === 1'b0);

  initial begin
    clock = 0;
  end

  initial begin
    $dumpfile("marmot_test1.vcd");
    $dumpvars(0, testbench);

    // Repeat cycles of 1000 clock edges as needed to complete testbench
    repeat (75) begin
      repeat (1000) @(posedge clock);
      // $display("+1000 cycles");
    end
    $display("%c[1;31m",27);
    `ifdef GL
      $display ("Monitor: Timeout, Test Mega-Project IO (GL) Failed");
    `else
      $display ("Monitor: Timeout, Test Mega-Project IO (RTL) Failed");
    `endif
    $display("%c[0m",27);
    $finish;
  end

  initial begin
    RSTB <= 1'b0;
    #1000;
    RSTB <= 1'b1;     // Release reset
    #2000;
  end

  initial begin   // Power-up sequence
    power1 <= 1'b0;
    power2 <= 1'b0;
    #200;
    power1 <= 1'b1;
    #200;
    power2 <= 1'b1;
  end

  wire flash_csb;
  wire flash_clk;
  wire flash_io0;
  wire flash_io1;

  wire VDD1V8;
  wire VDD3V3;
  wire VSS;
    
  assign VDD3V3 = power1;
  assign VDD1V8 = power2;
  assign VSS = 1'b0;

  assign mprj_io[3] = 1;  // Force CSB high.
  assign mprj_io[0] = 0;  // Disable debug mode

  caravel uut (
    .vddio    (VDD3V3),
    .vddio_2  (VDD3V3),
    .vssio    (VSS),
    .vssio_2  (VSS),
    .vdda   (VDD3V3),
    .vssa   (VSS),
    .vccd   (VDD1V8),
    .vssd   (VSS),
    .vdda1    (VDD3V3),
    .vdda1_2  (VDD3V3),
    .vdda2    (VDD3V3),
    .vssa1    (VSS),
    .vssa1_2  (VSS),
    .vssa2    (VSS),
    .vccd1    (VDD1V8),
    .vccd2    (VDD1V8),
    .vssd1    (VSS),
    .vssd2    (VSS),
    .clock    (clock_wire),
    .gpio     (gpio),
    .mprj_io  (mprj_io),
    .flash_csb(flash_csb),
    .flash_clk(flash_clk),
    .flash_io0(flash_io0),
    .flash_io1(flash_io1),
    .resetb   (RSTB)
  );

  spiflash #(
    .FILENAME("marmot_test1.hex")
  ) spiflash (
    .csb(flash_csb),
    .clk(flash_clk),
    .io0(flash_io0),
    .io1(flash_io1),
    .io2(),
    .io3()
  );

endmodule
`default_nettype wire