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[/] [xucpu/] [trunk/] [src/] [util/] [file/] [file_reader.vhdl] - Diff between revs 2 and 7

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-- Copyright 2015, Jürgen Defurne
 
--
 
-- This file is part of the Experimental Unstable CPU System.
 
--
 
-- The Experimental Unstable CPU System 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 3 of the
 
-- License, or (at your option) any later version.
 
--
 
-- The Experimental Unstable CPU System 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 Experimental Unstable CPU System. If not, see
 
-- http://www.gnu.org/licenses/lgpl.txt.
 
 
 
 
 
LIBRARY std;
 
USE std.textio.ALL;
 
USE work.exp_io.ALL;
 
 
 
ENTITY file_reader IS
 
 
 
END ENTITY file_reader;
 
 
 
ARCHITECTURE Imperative OF file_reader IS
 
 
 
  -- This provides a hard coded input file.
 
  -- This is opened when the program starts
 
  FILE input_file_1 : TEXT OPEN READ_MODE IS "test_input.txt";
 
  FILE std_out      : TEXT OPEN WRITE_MODE IS "STD_OUTPUT";
 
 
 
  -- These files could also be declared in the process that reads them. Then
 
  -- they need to be opened by using file_open()
 
 
 
BEGIN  -- ARCHITECTURE Imperative
 
 
 
  read_file : PROCESS IS
 
 
 
    VARIABLE input_line : LINE;
 
 
 
  BEGIN  -- PROCESS read_file
 
 
 
    -- The endfile() function tests if the end of the passed file has been
 
    -- reached.
 
    IF NOT endfile(input_file_1) THEN
 
      -- readline() reads a line from a file
 
      readline(input_file_1, input_line);
 
      writeline(std_out, input_line);
 
    ELSE
 
      write(input_line,test_f("Z"));
 
      writeline(std_out, input_line);
 
      WAIT;
 
    END IF;
 
 
 
  END PROCESS read_file;
 
 
 
  -- Files are declared by using FILE, in addition to SIGNALs and VARIABLEs.
 
  -- Since Xilinx XST only knows the type TEXT for file, it is of no use to try
 
  -- other types.
 
  -- When a file is declared in the ARCHITECTURE, then it is automatically opened.
 
  -- When a file is declared in a PROCESS, then the file can be opened by using
 
  -- the file_open() procedure.
 
  -- The contents of files are read into a VARIABLE of type LINE.
 
  -- Standard input and output must be declared as normal files, but with the
 
  -- file names "STD_INPUT" and "STD_OUTPUT".
 
 
 
END ARCHITECTURE Imperative;
 
 
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