This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

USB shell


The sample enables new experimental USB device support and the shell function. It is primarily intended to aid in the development and testing of USB controller drivers and new USB support.

Building and flashing

Assuming the board has a supported USB device controller, the example can be built like:

west build -b reel_board samples/subsys/usb/shell
west flash

For the USB host functionality a supported host controller is required, currently it is only MAX3421E. The example can be built as follows:

west build -b nrf52840dk/nrf52840 samples/subsys/usb/shell -- -DSHIELD=sparkfun_max3421e -DCONFIG_UHC_DRIVER=y -DCONFIG_USB_HOST_STACK=y
west flash

It is theoretically possible to build USB support using virtual USB controllers for all platforms, eventually the devicetree overlay has to be adjusted slightly if the platform has already defined or not zephyr_uhc0 or zephyr_udc0 nodelabels.

west build -b nrf52840dk/nrf52840 samples/subsys/usb/shell -- -DEXTRA_CONF_FILE=virtual.conf -DDTC_OVERLAY_FILE=virtual.overlay
west flash

Sample shell interaction

uart:~$ usbd defaults
dev: USB descriptors initialized
uart:~$ usbd config add 1
uart:~$ usbd class add foobaz 1
dev: added USB class foobaz to configuration 1
uart:~$ usbd init
dev: USB initialized
uart:~$ usbh init
host: USB host initialized
uart:~$ usbh enable
host: USB host enabled
[611:00:28.620,000] <wrn> usbd_core: VBUS detected event
uart:~$ usbh bus resume
host: USB bus resumed
uart:~$ usbd enable
host: USB device connected
dev: USB enabled
uart:~$ usbh device descriptor device 0
host: transfer finished 0x20006250, err 0
00000000: 80 06 00 01 00 00 12 00                          |........         |
bLength                      18
bDescriptorType              1
bcdUSB                       200
bDeviceClass                 239
bDeviceSubClass              2
bDeviceProtocol              1
bMaxPacketSize0              64
idVendor                     2fe3
idProduct                    ffff
bcdDevice                    301
iManufacturer                1
iProduct                     2
iSerial                      3
bNumConfigurations           1