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USB testing application

This sample implements a loopback function that can be used to test USB device drivers and the device stack connected to a Linux host and has a similar interface to “Gadget Zero” of the Linux kernel. The userspace tool testusb is needed to start the tests.

Building and flashing

Follow the general procedure for building and flashing Zephyr device.

Testing

To run USB tests:

Load the usbtest Linux kernel module on the Linux Host.

$ sudo modprobe usbtest vendor=0x2fe3 product=0x0009

The usbtest module should claim the device:

[21746.128743] usb 9-1: new full-speed USB device number 16 using uhci_hcd
[21746.303051] usb 9-1: New USB device found, idVendor=2fe3, idProduct=0009, bcdDevice= 2.03
[21746.303055] usb 9-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[21746.303058] usb 9-1: Product: Zephyr testusb sample
[21746.303060] usb 9-1: Manufacturer: ZEPHYR
[21746.303063] usb 9-1: SerialNumber: 86FE679A598AC47A
[21746.306149] usbtest 9-1:1.0: matched module params, vend=0x2fe3 prod=0x0009
[21746.306153] usbtest 9-1:1.0: Generic USB device
[21746.306156] usbtest 9-1:1.0: full-speed {control} tests

Use the testusb tool in linux/tools/usb inside Linux kernel source directory to start the tests.

$ sudo ./testusb -D /dev/bus/usb/009/016
/dev/bus/usb/009/016 test 0,    0.000007 secs
/dev/bus/usb/009/016 test 9,    4.994475 secs
/dev/bus/usb/009/016 test 10,   11.990054 secs

To run all the tests the Zephyr’s VID / PID should be inserted to USB driver id table. The method for loading the usbtest driver for our device is described here: https://lwn.net/Articles/160944/.

Since we use the “Gadget Zero” interface we specify reference device 0525:a4a0.
```
$ sudo sh -c "echo 0x2fe3 0x0009 0 0x0525 0xa4a0 > /sys/bus/usb/drivers/usbtest/new_id"
```

Use the testusb tool in linux/tools/usb inside Linux kernel source directory to start the tests.

$ sudo ./testusb -v 512 -D /dev/bus/usb/009/016
/dev/bus/usb/009/017 test 0,    0.000008 secs
/dev/bus/usb/009/017 test 1,    2.000001 secs
/dev/bus/usb/009/017 test 2,    2.003058 secs
/dev/bus/usb/009/017 test 3,    1.054082 secs
/dev/bus/usb/009/017 test 4,    1.001010 secs
/dev/bus/usb/009/017 test 5,   57.962142 secs
/dev/bus/usb/009/017 test 6,   35.000096 secs
/dev/bus/usb/009/017 test 7,   30.000063 secs
/dev/bus/usb/009/017 test 8,   18.000159 secs
/dev/bus/usb/009/017 test 9,    4.984975 secs
/dev/bus/usb/009/017 test 10,   11.991022 secs
/dev/bus/usb/009/017 test 11,   17.030996 secs
/dev/bus/usb/009/017 test 12,   17.103034 secs
/dev/bus/usb/009/017 test 13,   18.022084 secs
/dev/bus/usb/009/017 test 14,    2.458976 secs
/dev/bus/usb/009/017 test 17,    2.001089 secs
/dev/bus/usb/009/017 test 18,    1.998975 secs
/dev/bus/usb/009/017 test 19,    2.010055 secs
/dev/bus/usb/009/017 test 20,    1.999911 secs
/dev/bus/usb/009/017 test 21,    2.440972 secs
/dev/bus/usb/009/017 test 24,   55.112078 secs
/dev/bus/usb/009/017 test 27,   56.911052 secs
/dev/bus/usb/009/017 test 28,   34.163089 secs
/dev/bus/usb/009/017 test 29,    3.983999 secs