// 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

`ifdef GL
	`include "gl/user_project/gl/user_proj_top.v"
    `include "gl/user_project/gl/user_project_wrapper.v"
`else
 	`define USE_POWER_PINS
    `include "gl/user_project/gl/user_proj_top.v"
    `include "user_project_wrapper.v"
`endif

`include "caravel.v"
`include "spiflash.v"

module spm_tb;
	reg clock;
    reg RSTB;
	reg CSB;
	reg power1, power2;
	reg power3, power4;

	wire gpio;
	wire [37:0] mprj_io;
	wire [16:0] mprj_io_h;

	assign mprj_io_h = mprj_io[31:16];
	
	assign mprj_io[0] = 1'b0;
	assign mprj_io[1] = 1'b1;
	assign mprj_io[2] = 1'b0;
    assign mprj_io[3] = (CSB == 1'b1) ? 1'b1 : 1'bz;
	assign mprj_io[5] = 1'b0;

	// External clock is used by default.  Make this artificially fast for the
	// simulation.  Normally this would be a slow clock and the digital PLL
	// would be the fast clock.

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

	initial begin
		clock = 0;
	end

	initial begin
		$dumpfile("spm.vcd");
		$dumpvars(0, spm_tb);

		// Repeat cycles of 1000 clock edges as needed to complete testbench
		repeat (40) begin
			repeat (1000) @(posedge clock);
			// $display("+1000 cycles");
		end
		$display("%c[1;31m",27);
		$display ("Monitor: Timeout, Test Mega-Project IO Ports (RTL) Failed");
		$display("%c[0m",27);
		$finish;
	end

	initial begin
		wait(mprj_io_h == 16'hAB30);
		$display("Multiplication is done !");
	    wait(mprj_io_h == 16'hAB40);
		wait(mprj_io_h == 16'hAB30);
		$display("Multiplication is done !");
		wait(mprj_io_h == 16'hAB50);
		wait(mprj_io_h == 16'hAB30);
		$display("Multiplication is done !");
		wait(mprj_io_h == 16'hAB60);
	    $display("Monitor: Test 1 SPM Functional Test (RTL) Passed");
	    $finish;
	end

	initial begin
		RSTB <= 1'b0;
	    CSB <= 1'b1;
		#2000;
		RSTB <= 1'b1;	 // Release reset
		#170000;
		CSB = 1'b0;		// CSB can be released
	end

	initial begin		// Power-up sequence
		power1 <= 1'b0;
		power2 <= 1'b0;
		power3 <= 1'b0;
		power4 <= 1'b0;
		#100;
		power1 <= 1'b1;
		#100;
		power2 <= 1'b1;
		#100;
		power3 <= 1'b1;
		#100;
		power4 <= 1'b1;
	end

	always @(mprj_io) begin
		#1 $display("MPRJ-IO state = %b ", mprj_io[31:16]);
	end

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

	wire VDD3V3 = power1;
	wire VDD1V8 = power2;
	wire USER_VDD3V3 = power3;
	wire USER_VDD1V8 = power4;
	wire VSS = 1'b0;

	caravel uut (
		.vddio	  (VDD3V3),
		.vssio	  (VSS),
		.vdda	  (VDD3V3),
		.vssa	  (VSS),
		.vccd	  (VDD1V8),
		.vssd	  (VSS),
		.vdda1    (USER_VDD3V3),
		.vdda2    (USER_VDD3V3),
		.vssa1	  (VSS),
		.vssa2	  (VSS),
		.vccd1	  (USER_VDD1V8),
		.vccd2	  (USER_VDD1V8),
		.vssd1	  (VSS),
		.vssd2	  (VSS),
		.clock	  (clock),
		.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("spm.hex")
	) spiflash (
		.csb(flash_csb),
		.clk(flash_clk),
		.io0(flash_io0),
		.io1(flash_io1),
		.io2(),			// not used
		.io3()			// not used
	);

endmodule
`default_nettype wire