////////////////////////////////////////////////////////////////////////////
// SPDX-FileCopyrightText:  2021 , Dinesh Annayya
//
// 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
// SPDX-FileContributor: Modified by Dinesh Annayya <dinesha@opencores.org>
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Standalone User validation Test bench                       ////
////                                                              ////
////  This file is part of the riscdunio cores project            ////
////  https://github.com/dineshannayya/riscdunio.git              ////
////                                                              ////
////  Description                                                 ////
////   This is a standalone test bench to validate the            ////
////   Digital core.                                              ////
////   This test bench to valid Arduino example:                  ////
////     <example><Wire><i2c_scanner>                             ////
////                                                              ////
////  To Do:                                                      ////
////    nothing                                                   ////
////                                                              ////
////  Author(s):                                                  ////
////      - Dinesh Annayya, dinesh.annayya@gmail.com              ////
////                                                              ////
////  Revision :                                                  ////
////    0.1 - 29th July 2022, Dinesh A                            ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2000 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////

`default_nettype wire

`timescale 1 ns / 1 ns

`include "sram_macros/sky130_sram_2kbyte_1rw1r_32x512_8.v"
`include "is62wvs1288.v"
`include "uart_agent.v"
`include "i2c_slave_model.v"

`define TB_HEX "arduino_i2c_wr_rd.hex"
`define TB_TOP arduino_i2c_wr_rd_tb
module `TB_TOP;
parameter real CLK1_PERIOD  = 20; // 50Mhz
parameter real CLK2_PERIOD = 2.5;
parameter real IPLL_PERIOD = 5.008;
parameter real XTAL_PERIOD = 6;

`include "user_tasks.sv"

    //----------------------------------
    // Uart Configuration
    // ---------------------------------
    reg [1:0]      uart_data_bit        ;
    reg	       uart_stop_bits       ; // 0: 1 stop bit; 1: 2 stop bit;
    reg	       uart_stick_parity    ; // 1: force even parity
    reg	       uart_parity_en       ; // parity enable
    reg	       uart_even_odd_parity ; // 0: odd parity; 1: even parity
    
    reg [7:0]      uart_data            ;
    reg [15:0]     uart_divisor         ;	// divided by n * 16
    reg [15:0]     uart_timeout         ;// wait time limit
    
    reg [15:0]     uart_rx_nu           ;
    reg [15:0]     uart_tx_nu           ;
    reg [7:0]      uart_write_data [0:39];
    reg 	       uart_fifo_enable     ;	// fifo mode disable
	reg            flag                 ;
    reg            compare_start        ; // User Need to make sure that compare start match with RiscV core completing initial booting

	reg [31:0]     check_sum            ;
        

         integer i,j;


	initial begin
	    flag  = 0;
        compare_start = 0;
	end

	`ifdef WFDUMP
	   initial begin
	   	$dumpfile("simx.vcd");
	   	$dumpvars(3, `TB_TOP);
	   	$dumpvars(0, `TB_TOP.u_top.u_riscv_top.i_core_top_0);
	   	$dumpvars(0, `TB_TOP.u_top.u_riscv_top.u_connect);
	   	$dumpvars(0, `TB_TOP.u_top.u_riscv_top.u_intf);
	   	$dumpvars(0, `TB_TOP.u_top.u_uart_i2c_usb_spi.u_uart0_core);
	   	$dumpvars(0, `TB_TOP.u_top.u_uart_i2c_usb_spi.u_i2cm);
	   	$dumpvars(0, `TB_TOP.u_top.u_pinmux);
	   end
       `endif

       /*************************************************************************
       * This is Baud Rate to clock divider conversion for Test Bench
       * Note: DUT uses 16x baud clock, where are test bench uses directly
       * baud clock, Due to 16x Baud clock requirement at RTL, there will be
       * some resolution loss, we expect at lower baud rate this resolution
       * loss will be less. For Quick simulation perpose higher baud rate used
       * *************************************************************************/
       task tb_set_uart_baud;
       input [31:0] ref_clk;
       input [31:0] baud_rate;
       output [31:0] baud_div;
       reg   [31:0] baud_div;
       begin
	  // for 230400 Baud = (50Mhz/230400) = 216.7
	  baud_div = ref_clk/baud_rate; // Get the Bit Baud rate
	  // Baud 16x = 216/16 = 13
          baud_div = baud_div/16; // To find the RTL baud 16x div value to find similar resolution loss in test bench
	  // Test bench baud clock , 16x of above value
	  // 13 * 16 = 208,  
	  // (Note if you see original value was 216, now it's 208 )
          baud_div = baud_div * 16;
	  // Test bench half cycle counter to toggle it 
	  // 208/2 = 104
           baud_div = baud_div/2;
	  //As counter run's from 0 , substract from 1
	   baud_div = baud_div-1;
       end
       endtask
       

	initial begin
        uart_data_bit           = 2'b11;
        uart_stop_bits          = 0; // 0: 1 stop bit; 1: 2 stop bit;
        uart_stick_parity       = 0; // 1: force even parity
        uart_parity_en          = 0; // parity enable
        uart_even_odd_parity    = 1; // 0: odd parity; 1: even parity
	    tb_set_uart_baud(50000000,1152000,uart_divisor);// 50Mhz Ref clock, Baud Rate: 230400
        uart_timeout            = 20000;// wait time limit
        uart_fifo_enable        = 0;	// fifo mode disable

		$value$plusargs("risc_core_id=%d", d_risc_id);

       init();
		#200; // Wait for reset removal
	    repeat (10) @(posedge clock);
		$display("Monitor: Standalone User Risc Boot Test Started");

		// Remove Wb Reset
		//wb_user_core_write(`ADDR_SPACE_WBHOST+`WBHOST_GLBL_CFG,'h1);

	    repeat (2) @(posedge clock);
		#1;
        // Remove all the reset
        if(d_risc_id == 0) begin
             $display("STATUS: Working with Risc core 0");
             //wb_user_core_write(`ADDR_SPACE_GLBL+`GLBL_CFG_CFG0,'h11F);
        end else if(d_risc_id == 1) begin
             $display("STATUS: Working with Risc core 1");
             wb_user_core_write(`ADDR_SPACE_GLBL+`GLBL_CFG_CFG0,'h21F);
        end else if(d_risc_id == 2) begin
             $display("STATUS: Working with Risc core 2");
             wb_user_core_write(`ADDR_SPACE_GLBL+`GLBL_CFG_CFG0,'h41F);
        end else if(d_risc_id == 3) begin
             $display("STATUS: Working with Risc core 3");
             wb_user_core_write(`ADDR_SPACE_GLBL+`GLBL_CFG_CFG0,'h81F);
        end

        wait_riscv_boot();
        repeat (100) @(posedge clock);  // wait for Processor Get Ready

	    tb_uart.debug_mode = 0; // disable debug display
        tb_uart.uart_init;
        tb_uart.control_setup (uart_data_bit, uart_stop_bits, uart_parity_en, uart_even_odd_parity, 
                                       uart_stick_parity, uart_timeout, uart_divisor);

         u_i2c_slave_0.debug = 1; // disable i2c bfm debug message
         u_i2c_slave_1.debug = 1; // disable i2c bfm debug message

        repeat (1000) @(posedge clock);  // wait for Processor Get Ready
	    flag  = 0;
		check_sum = 0;
        compare_start = 1;
        
        fork
           begin
              while(flag == 0)
              begin
                 tb_uart.read_char(read_data,flag);
		         if(flag == 0)  begin
		            $write ("%c",read_data);
		            check_sum = check_sum+read_data;
		         end
              end
           end
           begin
              repeat (250000) @(posedge clock);  // wait for Processor Get Ready
           end
           join_any
        
           #100
           tb_uart.report_status(uart_rx_nu, uart_tx_nu);
        
           test_fail = 0;

		   $display("Total Rx Char: %d Check Sum : %x ",uart_rx_nu, check_sum);
           // Check 
           // if all the byte received
           // if no error 
           if(uart_rx_nu != 138) test_fail = 1;
           if(check_sum != 32'h00001e9d) test_fail = 1;

	   
	    	$display("###################################################");
          	if(test_fail == 0) begin
		   `ifdef GL
	    	       $display("Monitor: %m (GL) Passed");
		   `else
		       $display("Monitor: %m (RTL) Passed");
		   `endif
	        end else begin
		    `ifdef GL
	    	        $display("Monitor: %m (GL) Failed");
		    `else
		        $display("Monitor: %m (RTL) Failed");
		    `endif
		 end
	    	$display("###################################################");
	    $finish;
	end

// SSPI Slave I/F
assign io_in[5]  = 1'b1; // RESET

//---------------------------
// I2C
// --------------------------
tri scl,sda;

assign sda  =  (io_oeb[26] == 1'b0) ? io_out[26] : 1'bz;
assign scl   = (io_oeb[27] == 1'b0) ? io_out[27]: 1'bz;
assign io_in[26]  =  sda;
assign io_in[27]  =  scl;

pullup p1(scl); // pullup scl line
pullup p2(sda); // pullup sda line

 
i2c_slave_model  #(.I2C_ADR(7'h4)) u_i2c_slave_0 (
	.scl   (scl), 
	.sda   (sda)
       );

i2c_slave_model  #(.I2C_ADR(7'h10)) u_i2c_slave_1 (
	.scl   (scl), 
	.sda   (sda)
       );

`ifndef GL // Drive Power for Hold Fix Buf
    // All standard cell need power hook-up for functionality work
    initial begin

    end
`endif    

//------------------------------------------------------
//  Integrate the Serial flash with qurd support to
//  user core using the gpio pads
//  ----------------------------------------------------

   wire flash_clk = io_out[28];
   wire flash_csb = io_out[29];
   // Creating Pad Delay
   wire #1 io_oeb_33 = io_oeb[33];
   wire #1 io_oeb_34 = io_oeb[34];
   wire #1 io_oeb_35 = io_oeb[35];
   wire #1 io_oeb_36 = io_oeb[36];
   tri  #1 flash_io0 = (io_oeb_33== 1'b0) ? io_out[33] : 1'bz;
   tri  #1 flash_io1 = (io_oeb_34== 1'b0) ? io_out[34] : 1'bz;
   tri  #1 flash_io2 = (io_oeb_35== 1'b0) ? io_out[35] : 1'bz;
   tri  #1 flash_io3 = (io_oeb_36== 1'b0) ? io_out[36] : 1'bz;

   assign io_in[33] = flash_io0;
   assign io_in[34] = flash_io1;
   assign io_in[35] = flash_io2;
   assign io_in[36] = flash_io3;

   // Quard flash
     s25fl256s #(.mem_file_name(`TB_HEX),
	         .otp_file_name("none"),
                 .TimingModel("S25FL512SAGMFI010_F_30pF")) 
		 u_spi_flash_256mb (
           // Data Inputs/Outputs
       .SI      (flash_io0),
       .SO      (flash_io1),
       // Controls
       .SCK     (flash_clk),
       .CSNeg   (flash_csb),
       .WPNeg   (flash_io2),
       .HOLDNeg (flash_io3),
       .RSTNeg  (!wb_rst_i)

       );

   wire spiram_csb = io_out[31];

   is62wvs1288 #(.mem_file_name("none"))
	u_sram (
         // Data Inputs/Outputs
           .io0     (flash_io0),
           .io1     (flash_io1),
           // Controls
           .clk    (flash_clk),
           .csb    (spiram_csb),
           .io2    (flash_io2),
           .io3    (flash_io3)
    );

//---------------------------
//  UART Agent integration
// --------------------------
wire uart_txd,uart_rxd;

assign uart_txd   = io_out[7];
assign io_in[6]  = uart_rxd ;
 
uart_agent tb_uart(
	.mclk                (clock              ),
	.txd                 (uart_rxd           ),
	.rxd                 (uart_txd           )
	);

endmodule
`include "s25fl256s.sv"
`default_nettype wire