Renesas / Mbed OS GR-PEACH_Audio_Playback_7InchLCD_Sample

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)

decode/dec_flac.h

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

File content as of revision 6:a957aaa284f0:

/*******************************************************************************
* DISCLAIMER
* This software is supplied by Renesas Electronics Corporation and is only
* intended for use with Renesas products. No other uses are authorized. This
* software is owned by Renesas Electronics Corporation and is protected under
* all applicable laws, including copyright laws.
* THIS SOFTWARE IS PROVIDED "AS IS" AND RENESAS MAKES NO WARRANTIES REGARDING
* THIS SOFTWARE, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING BUT NOT
* LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* AND NON-INFRINGEMENT. ALL SUCH WARRANTIES ARE EXPRESSLY DISCLAIMED.
* TO THE MAXIMUM EXTENT PERMITTED NOT PROHIBITED BY LAW, NEITHER RENESAS
* ELECTRONICS CORPORATION NOR ANY OF ITS AFFILIATED COMPANIES SHALL BE LIABLE
* FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR
* ANY REASON RELATED TO THIS SOFTWARE, EVEN IF RENESAS OR ITS AFFILIATES HAVE
* BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
* Renesas reserves the right, without notice, to make changes to this software
* and to discontinue the availability of this software. By using this software,
* you agree to the additional terms and conditions found by accessing the
* following link:
* http://www.renesas.com/disclaimer*
* Copyright (C) 2015 Renesas Electronics Corporation. All rights reserved.
*******************************************************************************/

#ifndef DEC_FLAC_H
#define DEC_FLAC_H

#include "r_typedefs.h"
#include "stream_decoder.h"

/*--- User defined types ---*/
typedef struct {
    FLAC__StreamDecoder     *p_decoder;         /* Handle of flac decoder */
    FILE                    *p_file_handle;     /* Handle of flac file */
    uint64_t                decoded_sample;     /* Number of a decoded sample */
    uint64_t                total_sample;       /* Total number of sample */
    uint32_t                sample_rate;        /* Sample rate in Hz */
    uint32_t                channel_num;        /* Number of channels */
    uint32_t                bits_per_sample;    /* bit per sample */
    int32_t                 *p_pcm_buf;         /* Pointer of PCM buffer */
    uint32_t                pcm_buf_num;        /* Size of PCM buffer */
    uint32_t                pcm_buf_used_cnt;   /* Counter of used elements in PCM buffer */
} flac_ctrl_t;

/** Sets the PCM buffer to store decoded data
 *
 *  @param p_flac_ctrl Pointer to the control data of FLAC module.
 *  @param p_buf_addr Pointer to PCM buffer to store decoded data.
 *  @param buf_num Elements number of PCM buffer array.
 *
 *  @returns 
 *    Results of process. true is success. false is failure.
 */
bool flac_set_pcm_buf(flac_ctrl_t * const p_flac_ctrl, 
        int32_t * const p_buf_addr, const uint32_t buf_num);

/** Gets elements number of the decoded data
 *
 *  @param p_flac_ctrl Pointer to the control data of FLAC module.
 *
 *  @returns 
 *    Elements number of the decoded data.
 */
uint32_t flac_get_pcm_cnt(const flac_ctrl_t * const p_flac_ctrl);

/** Gets the playback time
 *
 *  @param p_flac_ctrl Pointer to the control data of FLAC module.
 *
 *  @returns 
 *    Playback time (second).
 */
uint32_t flac_get_play_time(const flac_ctrl_t * const p_flac_ctrl);

/** Gets the total playback time
 *
 *  @param p_flac_ctrl Pointer to the control data of FLAC module.
 *
 *  @returns 
 *    Total playback time (second).
 */
uint32_t flac_get_total_time(const flac_ctrl_t * const p_flac_ctrl);

/** Open the FLAC decoder
 *
 *  @param p_handle Pointer to the handle of FLAC file.
 *  @param p_flac_ctrl Pointer to the control data of FLAC module.
 *
 *  @returns 
 *    Results of process. true is success. false is failure.
 */
bool flac_open(FILE * const p_handle, flac_ctrl_t * const p_flac_ctrl);

/** Decode some audio frames.
 *
 *  @param p_flac_ctrl Pointer to the control data of FLAC module.
 *
 *  @returns 
 *    Results of process. true is success. false is failure.
 */
bool flac_decode(const flac_ctrl_t * const p_flac_ctrl);

/** Close the FLAC decoder
 *
 *  @param p_flac_ctrl Pointer to the control data of FLAC module.
 */
void flac_close(flac_ctrl_t * const p_flac_ctrl);

#endif /* DEC_FLAC_H */