// 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 wire

`timescale 1 ns / 1 ps

`include "uprj_netlists.v"
`include "caravel_netlists.v"
`include "spiflash.v"
`include "tb_prog.v"

module BrqRV_EB1_tb();
    reg clock;
    reg RSTB;
    reg CSB;
    reg power1, power2;
    reg power3, power4;
    
    wire gpio;
    wire [37:0] mprj_io;

    wire [27:0] mprj_io_0;
    wire mprj_ready;
    
    assign mprj_io_0 = mprj_io[35:8];
    assign mprj_ready = mprj_io[37];
    
    assign mprj_io[3] = (CSB == 1'b1) ? 1'b1 : 1'bz;
    
    always #12.5 clock <= (clock === 1'b0);
    
    initial begin
        clock = 0;
    end
 
    initial begin
        $dumpfile("BrqRV_EB1.vcd");
        $dumpvars(0, BrqRV_EB1_tb);

        // Repeat cycles of 1000 clock edges as needed to complete testbench
        //repeat (300) begin
        //    repeat (1000) @(posedge clock);
        //end
        //$display("%c[1;31m",27);
        //$display ("Monitor: Timeout, Test Project IO Stimulus (RTL) Failed");
        //$display("%c[0m",27);
        //$finish;
    end

	initial begin
	    wait(mprj_ready == 1'b1)
	    // Observe Output pins [35:8] for factorial
	    wait(mprj_io_0 == 28'h0000001);
	    wait(mprj_io_0 == 28'h0000002);
	    wait(mprj_io_0 == 28'h0000006);
    	    wait(mprj_io_0 == 28'h0000018);
	    wait(mprj_io_0 == 28'h0000078);
            wait(mprj_io_0 == 28'h00002D0);
	    wait(mprj_io_0 == 28'h00013B0);
            wait(mprj_io_0 == 28'h0009D80);
	    wait(mprj_io_0 == 28'h0058980);
            wait(mprj_io_0 == 28'h0375F00);
            
            // Observe Output pins [35:8] for prime_num
	    /*wait(mprj_io_0 == 28'd1);
	    wait(mprj_io_0 == 28'd3);
	    wait(mprj_io_0 == 28'd5);
    	    wait(mprj_io_0 == 28'd7);
	    wait(mprj_io_0 == 28'd11);
            wait(mprj_io_0 == 28'd13);
            */
            // Observe Output pins [35:8] for multliplication_table
            /*wait(mprj_io_0 == 28'd5);
            wait(mprj_io_0 == 28'd10);
            wait(mprj_io_0 == 28'd15);
            wait(mprj_io_0 == 28'd20);
            wait(mprj_io_0 == 28'd25);
            wait(mprj_io_0 == 28'd30);
            */
            // Observe Output pins [35:8] for mean & Determinant
            //wait(mprj_io_0 == 28'd5);
            
            // Observe Output pins [35:8] for power
            //wait(mprj_io_0 == 28'd64);
            
            // Observe Output pins [35:8] for flip number
            //wait(mprj_io_0 == 28'd4889874);
            
            // Observe Output pins [35:8] for Queue 
           // wait(mprj_io_0 == 28'd5);
           // wait(mprj_io_0 == 28'd6);
           // wait(mprj_io_0 == 28'd7);
            
            // Observe Output pins [35:8] for perfect square
            //wait(mprj_io_0 == 28'd5);
            
            // Observe Output pins [35:8] for counter / ascending / reverse
            /*wait(mprj_io_0 == 28'd0);
            wait(mprj_io_0 == 28'd1);
            wait(mprj_io_0 == 28'd2);
            wait(mprj_io_0 == 28'd3);
            wait(mprj_io_0 == 28'd4);
            wait(mprj_io_0 == 28'd5);
            wait(mprj_io_0 == 28'd6);
            wait(mprj_io_0 == 28'd7);
            wait(mprj_io_0 == 28'd8);
            wait(mprj_io_0 == 28'd9);
            wait(mprj_io_0 == 28'd10);
            wait(mprj_io_0 == 28'd11);
            */
            //wait(mprj_io_0 == 28'd3);
            //wait(mprj_io_0 == 28'd2);
            //wait(mprj_io_0 == 28'd1);
            //wait(mprj_io_0 == 28'd0);
            $display("MPRJ-IO state = %d ", mprj_io[35:8]);  
		
		`ifdef GL
	    	$display("Monitor: Test 1 Mega-Project IO (GL) Passed");
		`else
		    $display("Monitor: Test 1 Mega-Project IO (RTL) Passed");
		`endif
	    $finish;
	end
	
	// Reset Operation
    initial begin
        RSTB <= 1'b0;
        CSB  <= 1'b1;       // Force CSB high
        #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 = %d ", mprj_io[35:8]);
	end
	
	wire flash_csb;
	wire flash_clk;
	wire flash_io0;
	wire flash_io1;
	wire r_Rx_Serial;
	assign mprj_io[5] = r_Rx_Serial;
	assign mprj_io[3:0] = 4'h0;

	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("BrqRV_EB1.hex")
	) spiflash (
		.csb(flash_csb),
		.clk(flash_clk),
		.io0(flash_io0),
		.io1(flash_io1),
		.io2(),			// not used
		.io3()			// not used
	);
	
	
	uartprog #(
		.FILENAME("../hex/uart.hex")
	) prog_uut (
		//.clk(clock),
		.mprj_ready (mprj_ready),
		.r_Rx_Serial (r_Rx_Serial)
	);

endmodule
`default_nettype wire