The "GR-PEACH_Audio_Playback_7InchLCD_Sample" is a sample code that can provides high-resolution audio playback of FLAC format files. It also allows the user to audio-playback control functions such as play, pause, and stop by manipulating key switches.

Dependencies:   GR-PEACH_video R_BSP TLV320_RBSP USBHost_custom

Fork of GR-PEACH_Audio_Playback_Sample by Renesas

Note

For a sample program of without LCD Board, please refer to GR-PEACH_Audio_Playback_Sample.

Introduction

The "GR-PEACH_Audio_Playback_7InchLCD_Sample" is a sample code that can provides high-resolution audio playback of FLAC format files. It also allows the user to audio-playback control functions such as play, pause, and stop by manipulating key switches.

1. Overview of the Sample Code

1.1 Software Block Diagram

Figure 1.1 shows the software block diagram.

/media/uploads/1050186/lcd_figure1_1.png

1.2 Pin Definitions

Table 1.1 shows the pins used in this sample code.

/media/uploads/1050186/lcd_table1_1.png

2. Sample Code Operating Environment

In order to operate this sample code, GR-PEACH, Audio Camera Shield and 7.1 inch LCD Shield must be needed. For details on Audio Camera Shield and 7.1 inch LCD Shield, please refer to the following links, respectively:

In this section, it is described that how board is configured and to control audio playback via command line and touch screen.

2.1 Operating Environment

Figure 2.1 shows the overview of the operating environment for this sample code.

/media/uploads/1050186/lcd_figure2_1.png

Figure 2.2 and 2.3 show how to configure GR-PEACH, Audio Camera Shield and 7.1 inch LCD shield when using USB0 and USB1, respectively.

/media/uploads/1050186/lcd_figure2_2.png /media/uploads/1050186/lcd_figure2_3.png

Table 2.1 lists the overview of Graphical User Interface (GUI) of this sample code.

/media/uploads/1050186/lcd_table2_1.png

2.2 List of User Operations

Table 2.2 shows the relationship among Audio Playback, Command Line and Onboard Switch.

/media/uploads/1050186/lcd_table2_2.png

3. Function Outline

Table 3.1, 3.2 and 3.3 shows the overview of functions implemented in this sample code.

/media/uploads/1050186/lcd_table3_1.png /media/uploads/1050186/lcd_table3_2.png /media/uploads/1050186/lcd_table3_3.png /media/uploads/1050186/lcd_figure3_1.png

3.1 Playback Control

This sample program supports the operation "play", "pause", "stop", "play next song" and "play previous song".

3.2 Trick Play Control

In order to enable/disable Repeat Mode, user need to type "repeat" on command line or click the corresponding icon shown in Table 2.2. By derault, Repeat Mode is enabled. When Repeat Mode is enabled, the first song is played back after the playback of the last song is finished. Otherwise, the playback is shopped when finishing to play back the last song.

3.3 How to see Song Information

The information of the song being played back can be seen by typing playinfo on command line. Table 3.4 lists the items user can see on the terminal.

/media/uploads/dkato/audioplayback_table3_4.png

3.4 How to analyze the folder structure in USB stick

In this sample code, the folder structure in USB stick is analyzed in the breadth-first order. Table 3.5 shows how the files in USB stick are numbered.

/media/uploads/dkato/audioplayback_table3_5.png

4.Others

4.1 Serial Communication Setting

With respect to the default serial communication related setting on mbed, please refer to the follwing link:
https://developer.mbed.org/teams/Renesas/wiki/GR-PEACH-Getting-Started#install-the-usb-serial-communication
Please set up the terminal software you would like to use on your PC in consideration of the above. For example, 9600 should be specified for the baud rate on the terminal in order to control this sample via command line.

4.2 Necessary modification when using GCC ARM Embedded

If you would like to use GCC ARM Embedded, you must revise the following linker script incorporated in mbed OS 5 package as follows:

  • Linker Script to be modified
    $(PROJECT_ROOT)/mbed-os/targets/TARGET_RENESAS/TARGET_RZ_A1H/device/TOOLCHAIN_GCC_ARM/RZA1H.ld

    Please note that $(PROJECT_ROOT) in the above denotes the root directory of this sample code

  • Before Modification

RZA1H.ld

/* Linker script for mbed RZ_A1H */

/* Linker script to configure memory regions. */
MEMORY
{
  ROM   (rx)  : ORIGIN = 0x00000000, LENGTH = 0x02000000
  BOOT_LOADER (rx) : ORIGIN = 0x18000000, LENGTH = 0x00004000 
  SFLASH (rx) : ORIGIN = 0x18004000, LENGTH = 0x07FFC000 
  L_TTB (rw)  : ORIGIN = 0x20000000, LENGTH = 0x00004000 
  RAM (rwx) : ORIGIN = 0x20020000, LENGTH = 0x00700000
  RAM_NC (rwx) : ORIGIN = 0x20900000, LENGTH = 0x00100000
}
(snip)
  • After Modification

RZA1H.ld

/* Linker script for mbed RZ_A1H */

/* Linker script to configure memory regions. */
MEMORY
{
  ROM   (rx)  : ORIGIN = 0x00000000, LENGTH = 0x02000000
  BOOT_LOADER (rx) : ORIGIN = 0x18000000, LENGTH = 0x00004000 
  SFLASH (rx) : ORIGIN = 0x18004000, LENGTH = 0x07FFC000 
  L_TTB (rw)  : ORIGIN = 0x20000000, LENGTH = 0x00004000 
  RAM (rwx) : ORIGIN = 0x20020000, LENGTH = 0x00180000
  RAM_NC (rwx) : ORIGIN = 0x20200000, LENGTH = 0x00680000
}
(snip)

flac/README

Committer:
Osamu Nakamura
Date:
2017-04-11
Revision:
6:a957aaa284f0
Parent:
0:ee40da884cfc

File content as of revision 6:a957aaa284f0:

/* FLAC - Free Lossless Audio Codec
 * Copyright (C) 2001-2009  Josh Coalson
 * Copyright (C) 2011-2014  Xiph.Org Foundation
 *
 * This file is part the FLAC project.  FLAC is comprised of several
 * components distributed under different licenses.  The codec libraries
 * are distributed under Xiph.Org's BSD-like license (see the file
 * COPYING.Xiph in this distribution).  All other programs, libraries, and
 * plugins are distributed under the LGPL or GPL (see COPYING.LGPL and
 * COPYING.GPL).  The documentation is distributed under the Gnu FDL (see
 * COPYING.FDL).  Each file in the FLAC distribution contains at the top the
 * terms under which it may be distributed.
 *
 * Since this particular file is relevant to all components of FLAC,
 * it may be distributed under the Xiph.Org license, which is the least
 * restrictive of those mentioned above.  See the file COPYING.Xiph in this
 * distribution.
 */


FLAC is an Open Source lossless audio codec developed by Josh Coalson from 2001
to 2009.

From January 2012 FLAC is being maintained by Erik de Castro Lopo under the
auspices of the Xiph.org Foundation.

FLAC is comprised of
  * `libFLAC', a library which implements reference encoders and
    decoders for native FLAC and Ogg FLAC, and a metadata interface
  * `libFLAC++', a C++ object wrapper library around libFLAC
  * `flac', a command-line program for encoding and decoding files
  * `metaflac', a command-line program for viewing and editing FLAC
    metadata
  * player plugin for XMMS
  * user and API documentation

The libraries (libFLAC, libFLAC++) are
licensed under Xiph.org's BSD-like license (see COPYING.Xiph).  All other
programs and plugins are licensed under the GNU General Public License
(see COPYING.GPL).  The documentation is licensed under the GNU Free
Documentation License (see COPYING.FDL).


===============================================================================
FLAC - 1.3.1 - Contents
===============================================================================

- Introduction
- Prerequisites
- Note to embedded developers
- Building in a GNU environment
- Building with Makefile.lite
- Building with MSVC
- Building on Mac OS X


===============================================================================
Introduction
===============================================================================

This is the source release for the FLAC project.  See

	doc/html/index.html

for full documentation.

A brief description of the directory tree:

	doc/          the HTML documentation
	examples/     example programs demonstrating the use of libFLAC and libFLAC++
	include/      public include files for libFLAC and libFLAC++
	man/          the man pages for `flac' and `metaflac'
	src/          the source code and private headers
	test/         the test scripts

If you have questions about building FLAC that this document does not answer,
please submit them at the following tracker so this document can be improved:

	https://sourceforge.net/p/flac/support-requests/


===============================================================================
Prerequisites
===============================================================================

To build FLAC with support for Ogg FLAC you must have built and installed
libogg according to the specific instructions below.  You must have
libogg 1.1.2 or greater, or there will be seeking problems with Ogg FLAC.

If you are building on x86 and want the assembly optimizations, you will
need to have NASM >= 0.98.30 installed according to the specific instructions
below.


===============================================================================
Note to embedded developers
===============================================================================

libFLAC has grown larger over time as more functionality has been
included, but much of it may be unnecessary for a particular embedded
implementation.  Unused parts may be pruned by some simple editing of
configure.ac and src/libFLAC/Makefile.am; the following dependency
graph shows which modules may be pruned without breaking things
further down:

metadata.h
	stream_decoder.h
	format.h

stream_encoder.h
	stream_decoder.h
	format.h

stream_decoder.h
	format.h

In other words, for pure decoding applications, both the stream encoder
and metadata editing interfaces can be safely removed.

There is a section dedicated to embedded use in the libFLAC API
HTML documentation (see doc/html/api/index.html).

Also, there are several places in the libFLAC code with comments marked
with "OPT:" where a #define can be changed to enable code that might be
faster on a specific platform.  Experimenting with these can yield faster
binaries.


===============================================================================
Building in a GNU environment
===============================================================================

FLAC uses autoconf and libtool for configuring and building.
Better documentation for these will be forthcoming, but in
general, this should work:

./configure && make && make check && make install

The 'make check' step is optional; omit it to skip all the tests,
which can take several hours and use around 70-80 megs of disk space.
Even though it will stop with an explicit message on any failure, it
does print out a lot of stuff so you might want to capture the output
to a file if you're having a problem.  Also, don't run 'make check'
as root because it confuses some of the tests.

NOTE: Despite our best efforts it's entirely possible to have
problems when using older versions of autoconf, automake, or
libtool.  If you have the latest versions and still can't get it
to work, see the next section on Makefile.lite.

There are a few FLAC-specific arguments you can give to
`configure':

--enable-debug : Builds everything with debug symbols and some
extra (and more verbose) error checking.

--disable-asm-optimizations : Disables the compilation of the
assembly routines.  Many routines have assembly versions for
speed and `configure' is pretty good about knowing what is
supported, but you can use this option to build only from the
C sources.  May be necessary for building on OS X (Intel).

--enable-sse : If you are building for an x86 CPU that supports
SSE instructions, you can enable some of the faster routines
if your operating system also supports SSE instructions.  flac
can tell if the CPU supports the instructions but currently has
no way to test if the OS does, so if it does, you must pass
this argument to configure to use the SSE routines.  If flac
crashes when built with this option you will have to go back and
configure without --enable-sse.  Note that
--disable-asm-optimizations implies --disable-sse.

--enable-local-xmms-plugin : Installs the FLAC XMMS plugin in
$HOME/.xmms/Plugins, instead of the global XMMS plugin area
(usually /usr/lib/xmms/Input).

--with-ogg=
--with-xmms-prefix=
--with-libiconv-prefix=
Use these if you have these packages but configure can't find them.

If you want to build completely from scratch (i.e. starting with just
configure.ac and Makefile.am) you should be able to just run 'autogen.sh'
but make sure and read the comments in that file first.


===============================================================================
Building with Makefile.lite
===============================================================================

There is a more lightweight build system for do-it-yourself-ers.
It is also useful if configure isn't working, which may be the
case since lately we've had some problems with different versions
of automake and libtool.  The Makefile.lite system should work
on GNU systems with few or no adjustments.

From the top level just 'make -f Makefile.lite'.  You can
specify zero or one optional target from 'release', 'debug',
'test', or 'clean'.  The default is 'release'.  There is no
'install' target but everything you need will end up in the
obj/ directory.

If you are not on an x86 system or you don't have nasm, you
may have to change the DEFINES in src/libFLAC/Makefile.lite.  If
you don't have nasm, remove -DFLAC__HAS_NASM.  If your target is
not an x86, change -DFLAC__CPU_IA32 to -DFLAC__CPU_UNKNOWN.


===============================================================================
Building with MSVC
===============================================================================

There are .vcproj projects and a master FLAC.sln solution to build all
the libraries and executables with MSVC 2005 or newer.

Prerequisite: you must have the Ogg libraries installed as described
later.

Prerequisite: you must have nasm installed, and nasm.exe must be in
your PATH, or the path to nasm.exe must be added to the list of
directories for executable files in the MSVC global options.

To build everything, run Visual Studio, do File|Open and open FLAC.sln.
From the dropdown in the toolbar, select "Release" instead of "Debug",
then do Build|Build Solution.

This will build all libraries both statically (e.g.
objs\release\lib\libFLAC_static.lib) and as DLLs (e.g.
objs\release\lib\libFLAC.dll), and it will build all binaries, statically
linked (e.g. objs\release\bin\flac.exe).

Everything will end up in the "objs" directory.  DLLs and .exe files
are all that are needed and can be copied to an installation area and
added to the PATH.

By default the code is configured with Ogg support. Before building FLAC
you will need to get the Ogg source distribution
(see http://xiph.org/downloads/), build libogg_static.lib (load
win32\libogg_static.sln, change solution configuration to "Release" and
code generation to "Multi-threaded (/MT)", then build), copy libogg_static.lib
into FLAC's 'objs\release\lib' directory, and copy the entire include\ogg tree
into FLAC's 'include' directory (so that there is an 'ogg' directory in FLAC's
'include' directory with the files ogg.h, os_types.h and config_types.h).

If you want to build without Ogg support, instead edit all .vcproj files
and remove any "FLAC__HAS_OGG" definitions.


===============================================================================
Building on Mac OS X
===============================================================================

If you have Fink or a recent version of OS X with the proper autotools,
the GNU flow above should work.