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====== USB Gadget Mass storage ======
This page provides how to use the USB Gadget mass storage on ADSP-SC5xx board, and it will include the below test:
  * USB gadget mass storage ram test
  * USB Gadget mass storage hd test

----

===== Hardware Configuration =====
Connect the USB micro-B plug cable into the USB HS/OTG Device port, as showing below:
{{ :resources:tools-software:linuxdsp:docs:linux-kernel-and-drivers:usb:gadget-mode:002_usb_interface-device_application.jpg?600 |}}

----

===== Software Configuration =====
On the Yocto, Configure the linux-kernel as below to set the USB controller in Gadget only mode, and enable the USB Gadget Mass Storage relevant options.
<code c++>
$ bitbake linux-adi -c menuconfig
</code>

**Configure the USB drivers to Gadget only mode (or Dual role mode )**
<code shell >
Device Drivers  --->
	[*] USB support  --->
                <*>   Inventra Highspeed Dual Role Controller
                        MUSB Mode Selection (Gadget only mode)  --->
                        *** Platform Glue Layer *** 
                <*>     ADI
                        *** MUSB DMA mode ***
                [N]     Disable DMA (always use PIO)  
                [*]       Inventra
                <*>   USB Gadget Support  --->
</code>

**Configure the Gadget Mass Storage Support **
<code shell >
Device Drivers  --
->
	[*] USB support  --->
                <*>   USB Gadget Support  --->
                      <M>   USB Gadget precomposed configurations
                      <M>     Mass Storage Gadget   
</code>

----

===== Example Usage =====
**on the target Ez-Kit board** 
<code c++>
root@adsp-sc589-ezkit:~# dd if=/dev/zero of=/fsg.block bs=1M count=16
16+0 records in
16+0 records out
root@adsp-sc589-ezkit:~# modprobe g_mass_storage file=/fsg.block stall=0
Mass Storage Function, version: 2009/09/11
LUN: removable file: (no medium)
LUN: file: /fsg.block
Number of LUNs=1
g_mass_storage gadget: Mass Storage Gadget, version: 2009/09/11
g_mass_storage gadget: userspace failed to provide iSerialNumber
g_mass_storage gadget: g_mass_storage ready
g_mass_storage gadget: high-speed config #1: Linux File-Backed Storage
</code>

**On the Linux-Host PC**
  * **Fdisk and format the usb mass storage**
<code c++>
root@madara:~# sudo su
root@madara:~# ls /dev/sdb
/dev/sdb
root@madara:~#  time fdisk /dev/sdb
Welcome to fdisk (util-linux 2.31.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x7459b8e4.

Command (m for help): n
Partition type
   p   primary (0 primary, 0 extended, 4 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-32767, default 2048):
Last sector, +sectors or +size{K,M,G,T,P} (2048-32767, default 32767):

Created a new partition 1 of type 'Linux' and of size 15 MiB.

Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
real    0m10.807s
user    0m0.000s
sys     0m0.008s

root@madara:~# mke2fs /dev/sdb1
mke2fs 1.44.1 (24-Mar-2018)
Creating filesystem with 15360 1k blocks and 3840 inodes
Filesystem UUID: 3bd2120b-eca2-4c8f-9eb6-c408f9c1c0d9
Superblock backups stored on blocks:
        8193

Allocating group tables: done
Writing inode tables: done
Writing superblocks and filesystem accounting information: done
</code>

  * **Read/write test**
<code c++>
root@madara:~# mkdir /met/usb
root@madara:~# mount /dev/sdb1 /mnt/usb/
root@madara:~# date; time dd if=/dev/zero of=/mnt/usb/10m.bin bs=1M
Tuesday 14 July 2020 15:09:16 CST
dd: error writing '/mnt/usb/10m.bin': No space left on device
15+0 records in
14+0 records out
15032320 bytes (15 MB, 14 MiB) copied, 8.89978 s, 1.7 MB/s

real    0m8.901s
user    0m0.000s
sys     0m0.309s
root@madara:~# ls -lh /mnt/usb
total 15M
-rw-r--r-- 1 root root 15M July  14 16:08 10m.bin
drwx------ 2 root root 12K July 14 15:52 lost+found
root@madara:~# rm /mnt/usb/10m.bin
root@madara:~# ls -lh /mnt/usb/
total 12K
drwx------ 2 root root 12K July  14 15:52 lost+found
root@madara:~# umount /mnt/usb
</code>


----

**Go TO** [[resources:tools-software/linuxdsp/docs/linux-kernel-and-drivers/usb/start|USB Interface]]
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