////////////////////////////////////////////////////////////////////////////
// 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><SPi><DigitalPortControl>                       ////
////                                                              ////
////  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 "bfm_ad5205.sv"

`define TB_HEX "arduino_digital_port_control.hex"
`define TB_TOP  arduino_digital_port_control_tb
module arduino_digital_port_control_tb;

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"

reg            flag                 ;

parameter P_FSM_C      = 4'b0000; // Command Phase Only
parameter P_FSM_CW     = 4'b0001; // Command + Write DATA Phase Only
parameter P_FSM_CA     = 4'b0010; // Command -> Address Phase Only

parameter P_FSM_CAR    = 4'b0011; // Command -> Address -> Read Data
parameter P_FSM_CADR   = 4'b0100; // Command -> Address -> Dummy -> Read Data
parameter P_FSM_CAMR   = 4'b0101; // Command -> Address -> Mode -> Read Data
parameter P_FSM_CAMDR  = 4'b0110; // Command -> Address -> Mode -> Dummy -> Read Data

parameter P_FSM_CAW    = 4'b0111; // Command -> Address ->Write Data
parameter P_FSM_CADW   = 4'b1000; // Command -> Address -> DUMMY + Write Data
parameter P_FSM_CAMW   = 4'b1001; // Command -> Address -> MODE + Write Data

parameter P_FSM_CDR    = 4'b1010; // COMMAND -> DUMMY -> READ
parameter P_FSM_CDW    = 4'b1011; // COMMAND -> DUMMY -> WRITE
parameter P_FSM_CR     = 4'b1100;  // COMMAND -> READ

parameter P_MODE_SWITCH_IDLE     = 2'b00;
parameter P_MODE_SWITCH_AT_ADDR  = 2'b01;
parameter P_MODE_SWITCH_AT_DATA  = 2'b10;

parameter P_SINGLE = 2'b00;
parameter P_DOUBLE = 2'b01;
parameter P_QUAD   = 2'b10;
parameter P_QDDR   = 2'b11;

        
    integer    channel,level;

         integer i,j;


	initial begin
	   flag  = 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_pinmux);
	   	$dumpvars(0, `TB_TOP.u_top.u_uart_i2c_usb_spi);
	   end
       `endif

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

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

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

	    repeat (2) @(posedge clock);
		#1;

        // Remove WB and SPI Reset and CORE under Reset
        //wb_user_core_write(`ADDR_SPACE_GLBL+`GLBL_CFG_CFG0,'h01F);

		// QSPI SRAM:CS#2 Switch to QSPI Mode
        //wb_user_core_write(`ADDR_SPACE_WBHOST+`WBHOST_BANK_SEL,'h1000); // Change the Bank Sel 1000
		//wb_user_core_write(`ADDR_SPACE_QSPI+`QSPIM_IMEM_CTRL1,{16'h0,1'b0,1'b0,4'b0000,P_MODE_SWITCH_IDLE,P_SINGLE,P_SINGLE,4'b0100});
		//wb_user_core_write(`ADDR_SPACE_QSPI+`QSPIM_IMEM_CTRL2,{8'h0,2'b00,2'b00,P_FSM_C,8'h00,8'h38});
		//wb_user_core_write(`ADDR_SPACE_QSPI+`QSPIM_IMEM_WDATA,32'h0);

        // 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

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


        repeat (1000) @(posedge clock);  // wait for Processor Get Ready
        flag = 1;

      fork
      begin
          for (channel = 0; channel < 6; channel = channel+1) begin
            // change the resistance on this channel from min to max:
            for (level = 0; level < 64; level = level+1) begin
                wait(u_ad5205.channel == channel && u_ad5205.position ==  level);
                $display("Channel: %x and Position: %x",u_ad5205.channel,u_ad5205.position);
            end
            // change the resistance on this channel from min to max:
            for (level = 0; level < 64; level = level+1) begin
                wait((u_ad5205.channel == channel) && (u_ad5205.position ==  (64 -level)));
                $display("Channel: %x and Position: %x",u_ad5205.channel,u_ad5205.position);
            end
          end
          test_fail = 0;
      end
      begin
         repeat (1000000) @(posedge clock);  // wait for Processor Get Ready
         test_fail = 1;
      end
      join_any

      #100

	  $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("###################################################");
      #100
	    $finish;
	end

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

//-------------------------------------------------------------------------------------
//  Integrate the Serial SPI to ad5204/5206 (4-/6-Channel Digital Potentiometers)
//  https://www.analog.com/media/en/technical-documentation/data-sheets/ad5204_5206.pdf
//  -----------------------------------------------------------------------------------
   wire sspi_sck = (io_oeb[21] == 1'b0) ? io_out[21] : 1'b0;
   wire sspi_sdi = (io_oeb[20] == 1'b0) ? io_out[20] : 1'b0;
   wire sspi_ssn = (io_oeb[18] == 1'b0) ? io_out[18] : 1'b0;

   wire [2:0]      p_channel; // potentiometer channel
   wire [7:0]      p_position; // potentiometer position

   bfm_ad5205 u_ad5205(
              .sck      (sspi_sck    ),
              .sdi      (sspi_sdi    ),
              .ssn      (sspi_ssn    ),

              .channel  (p_channel   ),
              .position (p_position  )
             );

`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_oeb[28] == 1'b0) ? io_out[28]: 1'b0;
   wire flash_csb = (io_oeb[29] == 1'b0) ? io_out[29]: 1'b0;
   // 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] = (io_oeb[33] == 1'b1) ? flash_io0: 1'b0;
   assign io_in[34] = (io_oeb[34] == 1'b1) ? flash_io1: 1'b0;
   assign io_in[35] = (io_oeb[35] == 1'b1) ? flash_io2: 1'b0;
   assign io_in[36] = (io_oeb[36] == 1'b1) ? flash_io3: 1'b0;

   // 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_oeb[31] == 1'b0) ? io_out[31] : 1'b0;

   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)
    );

//-------------------------------------


endmodule
`include "s25fl256s.sv"
`default_nettype wire