Subversion Repositories vhdl_wb_tb

----------------------------------------------------------------------

----                                                              ----

----  VHDL Wishbone TESTBENCH                                     ----

----                                                              ----

----  This file is part of the vhdl_wb_tb project                 ----

----  http://www.opencores.org/cores/vhdl_wb_tb/                  ----

----                                                              ----

----  This file contains some type conversion functions.          ----

----                                                              ----

----  To Do:                                                      ----

----   -                                                          ----

----                                                              ----

----  Author(s):                                                  ----

----      - Sinx, sinx@opencores.org                              ----

----                                                              ----

----------------------------------------------------------------------

----    SVN information

----

----      $URL: file:///svn/vhdl_wb_tb/vhdl_wb_tb/trunk/rtl/vhdl/packages/convert_pkg.vhd $

---- $Revision: 21 $

----     $Date: 2018-08-01 12:05:41 +0200 (Wed, 01 Aug 2018) $

----   $Author: sinx $

----       $Id: convert_pkg.vhd 21 2018-08-01 10:05:41Z sinx $

----------------------------------------------------------------------

----                                                              ----

---- Copyright (C) 2018 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                     ----

----                                                              ----

----------------------------------------------------------------------

-- library -----------------------------------------------------------

LIBRARY ieee;

USE ieee.std_logic_1164.ALL;

USE ieee.std_logic_arith.ALL;

-- package -----------------------------------------------------------

PACKAGE convert_pkg IS

  FUNCTION to_std_logic_vector(input : integer; length : integer) RETURN std_logic_vector;

  FUNCTION to_integer(input : std_logic_vector) RETURN integer;

  FUNCTION to_string(int : integer; base : integer range 1 to 16 := 16; length : integer range 1 to 8:= 8) RETURN string;

  FUNCTION to_string(slv : std_logic_vector; base : integer range 1 to 16 := 16; length : integer range 1 to 8 := 8) RETURN string;

END convert_pkg;

-- package body ------------------------------------------------------

PACKAGE BODY convert_pkg IS

  ----------------------------------------------------------------------

  FUNCTION to_std_logic_vector(input : integer; length : integer) RETURN std_logic_vector IS

  BEGIN

    RETURN std_logic_vector(conv_unsigned(input, length));

  END;

  ----------------------------------------------------------------------

  FUNCTION to_integer(input : std_logic_vector) RETURN integer IS

  BEGIN

    RETURN conv_integer(unsigned(input));

  END;

  ----------------------------------------------------------------------

  FUNCTION to_char(int : integer) RETURN character IS

    VARIABLE c : character;

  BEGIN

    CASE int IS

      WHEN 0      => c := '0';

      WHEN 1      => c := '1';

      WHEN 2      => c := '2';

      WHEN 3      => c := '3';

      WHEN 4      => c := '4';

      WHEN 5      => c := '5';

      WHEN 6      => c := '6';

      WHEN 7      => c := '7';

      WHEN 8      => c := '8';

      WHEN 9      => c := '9';

      WHEN 10     => c := 'A';

      WHEN 11     => c := 'B';

      WHEN 12     => c := 'C';

      WHEN 13     => c := 'D';

      WHEN 14     => c := 'E';

      WHEN 15     => c := 'F';

      WHEN 16     => c := 'G';

      WHEN 17     => c := 'H';

      WHEN 18     => c := 'I';

      WHEN 19     => c := 'J';

      WHEN 20     => c := 'K';

      WHEN 21     => c := 'L';

      WHEN 22     => c := 'M';

      WHEN 23     => c := 'N';

      WHEN 24     => c := 'O';

      WHEN 25     => c := 'P';

      WHEN 26     => c := 'Q';

      WHEN 27     => c := 'R';

      WHEN 28     => c := 'S';

      WHEN 29     => c := 'T';

      WHEN 30     => c := 'U';

      WHEN 31     => c := 'V';

      WHEN 32     => c := 'W';

      WHEN 33     => c := 'X';

      WHEN 34     => c := 'Y';

      WHEN 35     => c := 'Z';

      WHEN OTHERS => c := '?';

    END CASE;

    RETURN c;

  END to_char;

  ----------------------------------------------------------------------

  FUNCTION to_string(int : integer;

                     base : integer range 1 to 16 := 16;

                     length : integer range 1 to 8 := 8

                     ) RETURN string IS

    VARIABLE temp    : string(1 TO 1000);

    VARIABLE num     : integer;

    VARIABLE abs_int : integer;

    VARIABLE len     : integer := 1;

    VARIABLE power   : integer := 1;

  BEGIN

    abs_int := ABS(int);

    num     := abs_int;

    --

    IF (length = 0) THEN                -- automatic length detection

      WHILE num >= base LOOP            -- Determine how many

        len := len + 1;                 -- characters required

        num := num / base;              -- to represent the

      END LOOP;  -- number.

    ELSE

      len := ABS(length);               --

    END IF;

    IF (base /= 10) THEN

      len := len + (len-1) / 4;                       -- increase for underlines

    END IF;

    --

    FOR i IN len DOWNTO 1 LOOP                        -- Convert the number to

      IF (((len-i) MOD 5 = 4) AND (base /= 10)) THEN  -- every fith char shell be an underline

        temp(i) := '_';

      ELSE

        temp(i) := to_char(abs_int/power MOD base);   -- a string starting

        power   := power * base;                      -- with the right hand

      END IF;

    END LOOP;  -- side.

    --

    -- return result and add sign if required

    IF (base = 16) THEN

      IF (int < 0) THEN

        CASE temp(len) IS

          WHEN '0'    => temp(len) := 'F';

          WHEN '1'    => temp(len) := '0';

          WHEN '2'    => temp(len) := '1';

          WHEN '3'    => temp(len) := '2';

          WHEN '4'    => temp(len) := '3';

          WHEN '5'    => temp(len) := '4';

          WHEN '6'    => temp(len) := '5';

          WHEN '7'    => temp(len) := '6';

          WHEN '8'    => temp(len) := '7';

          WHEN '9'    => temp(len) := '8';

          WHEN 'A'    => temp(len) := '9';

          WHEN 'B'    => temp(len) := 'A';

          WHEN 'C'    => temp(len) := 'B';

          WHEN 'D'    => temp(len) := 'C';

          WHEN 'E'    => temp(len) := 'D';

          WHEN 'F'    => temp(len) := 'E';

          WHEN OTHERS => NULL;

        END CASE;

        FOR i IN len DOWNTO 1 LOOP

          CASE temp(i) IS

            WHEN '0'    => temp(i) := 'F';

            WHEN '1'    => temp(i) := 'E';

            WHEN '2'    => temp(i) := 'D';

            WHEN '3'    => temp(i) := 'C';

            WHEN '4'    => temp(i) := 'B';

            WHEN '5'    => temp(i) := 'A';

            WHEN '6'    => temp(i) := '9';

            WHEN '7'    => temp(i) := '8';

            WHEN '8'    => temp(i) := '7';

            WHEN '9'    => temp(i) := '6';

            WHEN 'A'    => temp(i) := '5';

            WHEN 'B'    => temp(i) := '4';

            WHEN 'C'    => temp(i) := '3';

            WHEN 'D'    => temp(i) := '2';

            WHEN 'E'    => temp(i) := '1';

            WHEN 'F'    => temp(i) := '0';

            WHEN OTHERS => NULL;

          END CASE;

        END LOOP;  -- i

      END IF;

      RETURN temp(1 TO len);

    ELSE

      IF (int < 0) THEN

        RETURN '-'& temp(1 TO len);

      ELSE

        RETURN temp(1 TO len);

      END IF;

    END IF;

  END to_string;

  ----------------------------------------------------------------------

  FUNCTION to_string(slv : std_logic_vector) RETURN string IS

    VARIABLE hexlen  : integer;

    VARIABLE longslv : std_logic_vector(131 DOWNTO 0) := (OTHERS => '0');

    VARIABLE hex     : string(1 TO 32);

    VARIABLE fourbit : std_logic_vector(3 DOWNTO 0);

  BEGIN

    hexlen := ((slv'high - slv'low) + 1) / 4;

    IF (((slv'high - slv'low) + 1) MOD 4 /= 0) THEN

      hexlen := hexlen + 1;

    END IF;

    --

    longslv((slv'high - slv'low) DOWNTO 0) := slv;

    --

    FOR i IN (hexlen -1) DOWNTO 0 LOOP

      fourbit := longslv(((i*4)+3) DOWNTO (i*4));

      CASE fourbit IS

        WHEN "0000" => hex(hexlen -I) := '0';

        WHEN "0001" => hex(hexlen -I) := '1';

        WHEN "0010" => hex(hexlen -I) := '2';

        WHEN "0011" => hex(hexlen -I) := '3';

        WHEN "0100" => hex(hexlen -I) := '4';

        WHEN "0101" => hex(hexlen -I) := '5';

        WHEN "0110" => hex(hexlen -I) := '6';

        WHEN "0111" => hex(hexlen -I) := '7';

        WHEN "1000" => hex(hexlen -I) := '8';

        WHEN "1001" => hex(hexlen -I) := '9';

        WHEN "1010" => hex(hexlen -I) := 'A';

        WHEN "1011" => hex(hexlen -I) := 'B';

        WHEN "1100" => hex(hexlen -I) := 'C';

        WHEN "1101" => hex(hexlen -I) := 'D';

        WHEN "1110" => hex(hexlen -I) := 'E';

        WHEN "1111" => hex(hexlen -I) := 'F';

        WHEN "ZZZZ" => hex(hexlen -I) := 'z';

        WHEN "UUUU" => hex(hexlen -I) := 'u';

        WHEN "XXXX" => hex(hexlen -I) := 'x';

        WHEN OTHERS => hex(hexlen -I) := '?';

      END CASE;

    END LOOP;

    RETURN hex(1 TO hexlen);

  END to_string;

  ----------------------------------------------------------------------

  FUNCTION to_string( slv : std_logic_vector;

                      base : integer range 1 to 16 := 16;

                      length : integer range 1 to 8 := 8

                      ) RETURN string IS

  BEGIN

    RETURN to_string(to_integer(slv), base, length);

  END to_string;

  ----------------------------------------------------------------------

end package body;

----------------------------------------------------------------------

---- end of file                                                  ----

----------------------------------------------------------------------