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Overview¶

Now select “Let me pick from a list of device drivers on my computer” option. Select “Show All Devices” from the drop-down menu. Click over the “have disk” button. Enter the path for the Google USB driver. C: Program Files (x86) Android android-sdk extras google usbdriver. Zephyr Xtra (DCS51) Firmware. July 27, 2015 (version R5) - Small timing changes for the LED driver hardware update. Zephy Xtra R5 Firmware; Digitrax Device Firmware Update Instructions. Instructions on how to updated your firmware using the DigiIPL tool. SoundLoader (version 2.5.1).

This sample app demonstrates use of a USB Mass Storage driver by the Zephyrproject. This very simple driver enumerates a board with either RAM or FLASHinto an USB disk. This sample can be found undersamples/subsys/usb/mass in the Zephyr project tree.

Requirements¶

This project requires a USB device driver, and either 16KiB of RAM or a FLASHdevice.

Building and Running¶

This sample can be built for multiple boards, some generic and somecustomized through configurations found insamples/subsys/usb/mass/boards in the Zephyr projecttree.

Generic Example¶

The selection between a RAM-based or a FLASH-based disk can be selectedusing the overlay-ram-disk.conf or the overlay-flash-disk.confoverlays. In this example we will build the sample with a RAM-baseddisk:

After you have built and flashed the sample app image to your board, plug theboard into a host device, for example, a PC running Linux.The board will be detected as shown by the Linux journalctl command:

The disk contains a simple README.TXT file with the following content:

Files can be added or removed like with a simple USB disk, of course withinthe 16KiB limit.

nrf52840dk_nrf52840 Example¶

This board configures to use the external 64 MiBi QSPI flash chip with a64 KiBy littlefs partition compatible with the one produced by thelittlefs File System Sample Application.

After you have built and flashed the sample app image to your board,connect the board’s two USB connectors (debug and nRF USB) to a hostrunning a littlefs-FUSE-capable operating system. The output to theconsole will look something like this (file system contents will bedifferent):

For information on mounting littlefs file system on Linux or FreeBSDsystems refer to the “littlefs Usage” section below.

adafruit_feather_nrf52840 Example¶

This board configures to use the external 16 MiBi QSPI flash chip with a2 MiBy FAT partition.

After you have built and flashed the sample app image to your board,connect the board’s USB connector to a host capable of mounting FATdrives. The output to the console will look something like this(file system contents will be different):

On most operating systems the drive will be automatically mounted.

littlefs Usage¶

While a FAT-based file system can be mounted by many systems automatically,mounting the littlefs file system on a Linux or FreeBSD system can beaccomplished using the littlefs-FUSE utility.

First determine the local device name from the system log, e.g.:

This shows that the block device associated with the USB drive is/dev/sdd:

Zephyr Usb Devices Driver Update

This can be mounted as a file system with the following commands:

which produces this output:

Zephyr USB Devices Driver

lfs is a mount command and you should take care to unmount thedevice before removing the USB drive:

littlefs parameter selection¶

Zephyr Usb Devices Drivers

Be aware that the parameters passed to lfs in the exampleabove must exactly match the corresponding parameters used toinitialize the file system. The required parameters can be observedfrom the Zephyr mount log messages:

• --read_size corresponds to the rd size and is 16;

• --prog_size corresponds to the pr size and is 16;

• --block_size comes from 0x1000-byteblocks and is 4096 (0x1000);

• --block_count comes from 160x1000-byteblocks and is 16;

• --cache_size comes from the ca size and is 64;

• --lookahead_size comes from the la size and is 32

Zephyr Usb Devices Driver Downloads

If any of the parameters are inconsistent between the Zephyr and Linuxspecification the file system will not mount correctly.