RockpiE/dev/usb-mass-storage

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    ROCK Pi E >  Development >  USB Mass Storage

Description

This guide describe how to setup USB Mass Storage OTG on ROCK Pi E.

Requirement

• ROCK Pi E mainboard
• eMMC module
• Power adapter
• USB Male A to Dupont cable.
  • One port is Male A type and the other includes three Dupont lines.
  • Hardware connection

ROCK Pi E 40-pin Header	USB Interface	USB Male A to Dupont Cable
PIN#18	Data+	Green wire
PIN#16	Data-	White wire
PIN#14	GND	Black wire

Support

Support hardware platform:

• ROCK Pi E V1.1 or later

You'd better follow the installation steps.

Operations on ROCK Pi E

For example, my testing borad is Rock pi E V1.2 on Debian buster, Linux rockpie 4.4.194-19-rockchip-g287ff75afc47

You can use ssh or serial console to access ROCK Pi E.

Step 1: Add the following line to file /boot/uEnv.txt.

overlays=rk3328-uart2  rk3328-usb-otg

Step 2: Update rockchip-overlay, kernel, rockchip-adbd kernel packages.

 $ sudo apt-get install -y rockchip-overlay 
 $ sudo apt-get install -y linux-4.4-rock-pi-e-latest

Step 3: Add the following to /etc/modules

 $ cat /etc/modules
  # /etc/modules: kernel modules to load at boot time.
  #
  # This file contains the names of kernel modules that should be loaded
  # at boot time, one per line. Lines beginning with "#" are ignored.
  g_mass_storage

Step 4: Reboot the device.

 $ sudo reboot

Step 5: Create a file to be a shared space and make it FAT32 type.

 $ sudo dd if=/dev/zero of=/home/rock/share bs=1M count=512 status=progress
 $ sudo apt-get install dosfstools
 $ sudo mkfs.fat /piusb.bin -F 32 -I

Step 6: Enable usb mass storage with the file

 $ sudo modprobe g_mass_storage file=/home/rock/share stall=0 removable=1
 $ sudo mount /home/rock/share /mnt/
 $ sudo touch /mnt/a.c
 $ ls 
  a.c

Operations on PC

Now, you can see the new partition /dev/sdx is mounted.

 $ lsblk
  ......
  sdd      8:48   1   512M  0 disk /mnt
 $ ls /mnt
  a.c

Attention

When add files to this shared space, the other side needs to be unmounted and remounted the shared space.For example:

On Rock Pi E: Create a new file to it.

 $ sudo touch /mnt/b.c
 $ ls 
  a.c b.c

On PC:

 $ ls /mnt
  a.c

It just have one file a.c, new you should remount to update it.

 $ sudo umount /mnt
 $ sudo mount /dev/sdd /mnt
 $ ls /mnt
  a.c b.c