USB Gadget


This README describes a way the USB Gadget feature can be used on Renesas Porter boards.

Hardware setup

To use the USB Gadget feature, you need an extra micro-USB cable. The proposed setup is based on the selection of USB OTG feature by configuring the jumper JP13 between 1-2 (“Host”). Then, you can plug the cable in CN22 connector (“USB Channel 0”).

Software setup

Be sure you have the “usbgadget” feature in the DISTRO_FEATURES bitbake environment variable.


Manual configuration

Example to uses Ethernet over USB feature:

# modprobe g_ether
# ip a | grep -A 2 usb0
5: usb0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 4e:bc:d4:ab:7e:e5 brd ff:ff:ff:ff:ff:ff
# ip address add dev usb0

Now, from your host computer you can check connectivity:

$ ping
PING ( 56(84) bytes of data.
64 bytes from icmp_seq=1 ttl=64 time=0.370 ms
64 bytes from icmp_seq=2 ttl=64 time=0.406 ms

Persistent configuration

We can load the module at startup, by creating a file /etc/modules-load.d/g_ether.conf.

The file content should be as below:

# Load g_ether at boot

Connman can handle the Ethernet over USB link. First, we create the directory which contain the configuration file:

# mkdir /etc/connman

Then we can edit a /etc/connman/main.conf file: