// SPDX-FileCopyrightText: Copyright (C) 2017  Clifford Wolf <clifford@clifford.at>
//
// 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
/*
 *  StriVe - A full example SoC using PicoRV32 in SkyWater s8
 *
 *  Copyright (C) 2017  Clifford Wolf <clifford@clifford.at>
 *  Copyright (C) 2018  Tim Edwards <tim@efabless.com>
 *
 *  Permission to use, copy, modify, and/or distribute this software for any
 *  purpose with or without fee is hereby granted, provided that the above
 *  copyright notice and this permission notice appear in all copies.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

`timescale 1 ns / 1 ps

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

module timer_tb;

	reg RSTB;
	reg clock;
	reg power1, power2;

	always #10 clock <= (clock === 1'b0);

	initial begin
		clock <= 0;
	end

	initial begin
		$dumpfile("timer.vcd");
		$dumpvars(0, timer_tb);

		// Repeat cycles of 1000 clock edges as needed to complete testbench
		repeat (50) begin
			repeat (1000) @(posedge clock);
			$display("+1000 cycles");
		end
		$display("%c[1;31m",27);
		`ifdef GL
			$display ("Monitor: Timeout, Test GPIO (GL) Failed");
		`else
			$display ("Monitor: Timeout, Test GPIO (RTL) Failed");
		`endif
		 $display("%c[0m",27);
		$finish;
	end

	wire [37:0] mprj_io;	// Most of these are no-connects
	wire [5:0] checkbits;
	wire [31:0] countbits;

	assign checkbits = mprj_io[37:32];
	assign countbits = mprj_io[31:0];

	assign mprj_io[3] = 1'b1;  // Force CSB high.

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

	// Monitor
	initial begin
		wait(checkbits == 6'h0a);
		`ifdef GL
			$display("Monitor: Test Timer (GL) Started");
		`else 
			$display("Monitor: Test Timer (RTL) Started");
		`endif
		/* Add checks here */
		wait(checkbits == 6'h01);
		$display("   countbits = 0x%x (should be 0xdcba7cfb)", countbits);
		if(countbits !== 32'hdcba7cfb) begin
		    $display("Monitor: Test Timer Failed");
		    $finish;
		end
		wait(checkbits == 6'h02);
		$display("   countbits = 0x%x (should be 0x19)", countbits);
		if(countbits !== 32'h19) begin
		    $display("Monitor: Test Timer Failed");
		    $finish;
		end
		wait(checkbits == 6'h03);
		$display("   countbits = %x (should be 0x0f)", countbits);
		if(countbits !== ((32'h0f) | (3'b100))) begin
		    $display("Monitor: Test Timer Failed");
		    $finish;
		end
		wait(checkbits == 6'h04);
		$display("   countbits = %x (should be 0x0f)", countbits);
		if(countbits !== ((32'h0f) | (3'b100))) begin
		    $display("Monitor: Test Timer Failed");
		    $finish;
		end
		wait(checkbits == 6'h05);
		$display("   countbits = %x (should be 0x12bc)", countbits);
		if(countbits !== 32'h12bc) begin
		    $display("Monitor: Test Timer Failed");
		    $finish;
		end
		
		`ifdef GL
			$display("Monitor: Test Timer (GL) Passed");
		`else
			$display("Monitor: Test Timer (RTL) Passed");
		`endif
		$finish;
	end

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

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

	always @(checkbits) begin
		#1 $display("Timer state = %b (%d)", countbits, countbits);
	end

	wire VDD3V3;
	wire VDD1V8;
	wire VSS;

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

	// These are the mappings of mprj_io GPIO pads that are set to
	// specific functions on startup:
	//
	// JTAG      = mgmt_gpio_io[0]              (inout)
	// SDO       = mgmt_gpio_io[1]              (output)
	// SDI       = mgmt_gpio_io[2]              (input)
	// CSB       = mgmt_gpio_io[3]              (input)
	// SCK       = mgmt_gpio_io[4]              (input)
	// ser_rx    = mgmt_gpio_io[5]              (input)
	// ser_tx    = mgmt_gpio_io[6]              (output)
	// irq       = mgmt_gpio_io[7]              (input)

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

endmodule
`default_nettype wire