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--! @file

--! @brief Testbench for OpenCpu top design

--! Use standard library and import the packages (std_logic_1164,std_logic_unsigned,std_logic_arith)

LIBRARY ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_unsigned.all;

use ieee.std_logic_arith.all;

--! Use CPU Definitions package

use work.pkgOpenCPU32.all;

--! Adding library for File I/O 

-- More information on this site:

-- http://people.sabanciuniv.edu/erkays/el310/io_10.pdf

-- http://eesun.free.fr/DOC/vhdlref/refguide/language_overview/test_benches/reading_and_writing_files_with_text_i_o.htm

use std.textio.ALL;

use ieee.std_logic_textio.all;

ENTITY testOpenCpu IS

generic (n : integer := nBits - 1);                                                                                     --! Generic value (Used to easily change the size of the Alu on the package)

END testOpenCpu;

--! @brief openCpu Testbench file

--! @details This is the top-level test...

ARCHITECTURE behavior OF testOpenCpu IS

    --! Component declaration to instantiate the Multiplexer circuit                    

    COMPONENT openCpu

    generic (n : integer := nBits - 1);                                                                 --! Generic value (Used to easily change the size of the Alu on the package)

         Port ( rst : in  STD_LOGIC;                                                                                            --! Reset signal

           clk : in  STD_LOGIC;                                                                                         --! Clock signal

           mem_rd : out  STD_LOGIC;                                                                                     --! Main memory Read enable

           mem_rd_addr : out  STD_LOGIC_VECTOR (n downto 0);             --! Main memory Read address

           mem_wr : out  STD_LOGIC;                                                                                     --! Main memory Write enable

           mem_wr_addr : out  STD_LOGIC_VECTOR (n downto 0);             --! Main memory Write address

                          mem_data_in : in  STD_LOGIC_VECTOR (n downto 0);                       --! Data comming from main memory

                          mem_data_out : out  STD_LOGIC_VECTOR (n downto 0)              --! Data to main memory

                          );

    END COMPONENT;

   --Inputs

   signal rst : std_logic := '0';                                                                                                                --! Wire to connect Test signal to component

   signal clk : std_logic := '0';                                                                                                                --! Wire to connect Test signal to component

   signal mem_data_in : std_logic_vector(n downto 0) := (others => '0');  --! Wire to connect Test signal to component

        --Outputs

   signal mem_rd : std_logic;                                                                                                                           --! Wire to connect Test signal to component

   signal mem_rd_addr : std_logic_vector(n downto 0);                                                            --! Wire to connect Test signal to component

   signal mem_wr : std_logic;                                                                                                                           --! Wire to connect Test signal to component

   signal mem_wr_addr : std_logic_vector(n downto 0);                                                            --! Wire to connect Test signal to component

   signal mem_data_out : std_logic_vector(n downto 0);                                                   --! Wire to connect Test signal to component

   -- Clock period definitions

   constant clk_period : time := 10 ns;

BEGIN

        --! Instantiate the Unit Under Test (openCpu) (Doxygen bug if it's not commented!)

   uut: openCpu PORT MAP (

          rst => rst,

          clk => clk,

          mem_rd => mem_rd,

          mem_rd_addr => mem_rd_addr,

          mem_wr => mem_wr,

          mem_wr_addr => mem_wr_addr,

          mem_data_in => mem_data_in,

          mem_data_out => mem_data_out

        );

   -- Clock process definitions

   clk_process :process

   begin

                clk <= '0';

                wait for clk_period/2;

                clk <= '1';

                wait for clk_period/2;

   end process;

   -- Stimulus process

   stim_proc: process

        file cmdfile: TEXT;                             -- Define the file 'handle'

        variable line_in: Line; -- Line buffer

        variable good: boolean;                         -- Flag to detect a good line read

        variable instructionCode : std_logic_vector(n downto 0);

   begin

      -- Reset operation

                REPORT "RESET" SEVERITY NOTE;

                -- Open source file for reading...

                FILE_OPEN(cmdfile,"testCode/testCodeBin.dat",READ_MODE);

                -- Check end of file

                if endfile(cmdfile) then

                        assert false report "End of file found..." severity failure;

                end if;

                rst <= '1';

      wait for 15 ns;

                rst <= '0';

                wait for 15 ns;

                while not endfile( cmdfile ) loop

                        readline(cmdfile,line_in);                       -- Read a line from the file

                        read(line_in,instructionCode,good);     -- Read the CI input

                        assert good report "Could not parse the line" severity ERROR;

                        mem_data_in <= instructionCode;

                        wait until mem_rd = '0';

                end loop;

                wait until mem_rd = '0';

      -- Finish simulation

                assert false report "NONE. End of simulation." severity failure;

                wait;

   end process;

END;