Subversion Repositories t51

--
-- I2S port with binary file log
--
-- Version : 0146
--
-- Copyright (c) 2001 Daniel Wallner (jesus@opencores.org)
--
-- All rights reserved
--
-- Redistribution and use in source and synthezised forms, with or without
-- modification, are permitted provided that the following conditions are met:
--
-- Redistributions of source code must retain the above copyright notice,
-- this list of conditions and the following disclaimer.
--
-- Redistributions in synthesized form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in the
-- documentation and/or other materials provided with the distribution.
--
-- Neither the name of the author nor the names of other contributors may
-- be used to endorse or promote products derived from this software without
-- specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-- POSSIBILITY OF SUCH DAMAGE.
--
-- Please report bugs to the author, but before you do so, please
-- make sure that this is not a derivative work and that
-- you have the latest version of this file.
--
-- The latest version of this file can be found at:
--	http://www.opencores.org/cvsweb.shtml/t51/
--
-- Limitations :
--
-- File history :
--
 
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.numeric_std.all;
 
entity I2SLog is
	generic(
		FileName		: string;
		Bytes			: integer := 2;		-- Number of bytes per word
		LittleEndian	: boolean := true	-- Byte order
	);
	port(
		BClk			: in std_logic;
		FSync			: in std_logic;
		SData			: in std_logic
	);
end I2SLog;
 
architecture behaviour of I2SLog is
 
	function to_char(
		constant Byte : std_logic_vector(7 downto 0)
	) return character is
	begin
		return character'val(to_integer(unsigned(Byte)));
	end function;
 
begin
	process (BClk)
		type ChFile is file of character;
		file OutFile	: ChFile open write_mode is FileName;
		variable Data	: std_logic_vector(Bytes * 8 - 1 downto 0);
		variable BPhase	: integer := 64;
		variable OldFS	: std_logic;
	begin
		if BClk'event and BClk = '1' then
			if BPhase mod 32 = Bytes * 8 then
				if LittleEndian then
					for i in integer range 0 to Bytes - 1 loop
						write(OutFile, to_char(Data(i * 8 + 7 downto i * 8)));
					end loop;
				else
					for i in integer range Bytes - 1 downto 0 loop
						write(OutFile, to_char(Data(i * 8 + 7 downto i * 8)));
					end loop;
				end if;
			end if;
 
			if OldFS = '1' and FSync = '0' then
				BPhase := 0;
			else
				BPhase := BPhase + 1;
			end if;
			OldFS := FSync;
 
			Data(Bytes * 8 - 1 downto 1) := Data(Bytes * 8 - 2 downto 0);
			Data(0) := SData;
		end if;
	end process;
end;