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

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.

1.2 Pin Definitions

Table 1.1 shows the pins used in this sample code.

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:

• Audio Camera Shield
  https://developer.mbed.org/teams/Renesas/wiki/Audio_Camera-shield
• 7.1 inch LCD Shield
  https://developer.mbed.org/teams/Renesas/wiki/LCD-shield

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.



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.



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

2.2 List of User Operations

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

3. Function Outline

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

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.

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.

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

/* 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

/* 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)

--- a/main/system.cpp	Mon Jan 25 02:41:36 2016 +0000
+++ b/main/system.cpp	Tue Apr 11 11:49:13 2017 +0900
@@ -23,6 +23,7 @@
 
 #include "mbed.h"
 #include "rtos.h"
+#include "FATFileSystem.h"
 #include "USBHostMSD.h"
 
 #include "system.h"
@@ -163,7 +164,8 @@
         const fid_scan_folder_t * const p_data, const SYS_MAIL_ID mail_id, 
         const uint32_t * const p_param);
 static SYS_EVENT check_usb_event(const SYS_STATE stat, 
-                    const usb_ctrl_t * const p_ctrl, USBHostMSD * const p_msd);
+        const usb_ctrl_t * const p_ctrl, USBHostMSD * const p_msd, 
+        FATFileSystem * const p_fs);
 static SYS_STATE state_trans_proc(const SYS_STATE stat, 
                         const SYS_EVENT event, sys_ctrl_t * const p_ctrl);
 static SYS_STATE state_trans_proc(const SYS_STATE stat, 
@@ -220,7 +222,8 @@
     SYS_MAIL_ID         mail_type;
     uint32_t            mail_param[MAIL_PARAM_NUM];
     static sys_ctrl_t   sys_ctrl;
-    static USBHostMSD   msd(SYS_USB_MOUNT_NAME);
+    static FATFileSystem fs(SYS_USB_MOUNT_NAME);
+    static USBHostMSD msd;
 #if (USB_HOST_CH == 1) /* Audio Shield USB1 */
     static DigitalOut   usb1en(P3_8);
 
@@ -236,7 +239,7 @@
     (void) dsp_notify_disp_mode(sys_ctrl.play_info.disp_mode);
     sys_stat = SYS_ST_WAIT_USB_CONNECT;
     while (1) {
-        sys_ev = check_usb_event(sys_stat, &sys_ctrl.usb_ctrl, &msd);
+        sys_ev = check_usb_event(sys_stat, &sys_ctrl.usb_ctrl, &msd, &fs);
         if (sys_ev == SYS_EV_NON) {
             result = recv_mail(&mail_type, &mail_param[MAIL_PARAM0], 
                         &mail_param[MAIL_PARAM1], &mail_param[MAIL_PARAM2]);
@@ -427,14 +430,17 @@
  *  @param stat Status of main thread
  *  @param p_ctrl Pointer to the control data of USB memory
  *  @param p_msd Pointer to the class object of USBHostMSD
+ *  @param P_fs Pointer to the class oblect of FATFileSystem
  *
  *  @returns 
  *    The event code of SYS_EVENT
  */
 static SYS_EVENT check_usb_event(const SYS_STATE stat, 
-                        const usb_ctrl_t * const p_ctrl, USBHostMSD * const p_msd)
+        const usb_ctrl_t * const p_ctrl, 
+        USBHostMSD * const p_msd, FATFileSystem * const p_fs)
 {
     SYS_EVENT       ret = SYS_EV_NON;
+    int             iRet;
     bool            result;
 
     if ((p_ctrl != NULL) && (p_msd != NULL)) {
@@ -443,8 +449,8 @@
             /* Because the connecting USB memory is changed. */
             result = p_msd->connect();
             if (result == true) {
-                (void) p_msd->unmount();
-                (void) p_msd->mount();
+                iRet = p_fs->unmount();
+                iRet = p_fs->mount(p_msd);
                 ret = SYS_EV_USB_CONNECT;
             }
         } else if (p_ctrl->usb_flag_detach != true) {