Gadget Serial Driver on the USB device port
This article illustrate how to use the Linux Gadget Serial Driver to emulate an USB serial device
accessible via a virtual serial port from your PC with an Acme Systems board.
To enable this feature is not requested any new driver on the factory default bootable microSD.
We'll illustrate how to communicate with an Acme board wired to your PC with a simple USB cable
using Hyper Terminal or putty on Windows PC.
Download and save on your PC this file linux-cdc-acm.inf.
Plug a miniUSB cable between the FOX Board USB device port and a USB host port on your PC.
Type from the board command line:
modprobe g_serial
Windows should recognize the gadget serial device and ask for a driver.
Tell Windows to find the driver in the folder that contains the linux-cdc-acm.inf
file. For example, on Windows XP, when the gadget serial device is first
plugged in, the "Found New Hardware Wizard" starts up. Select
Install from a list or specific location (Advanced)", then on the
next screen select "Include this location in the search" and enter the
path or browse to the folder containing the "linux-cdc-acm.inf" file.
Windows will complain that the Gadget Serial driver has not passed
Windows Logo testing, but select "Continue anyway" and finish the
driver installation.
On Windows XP, in the "Device Manager" (under "Control Panel",
"System", "Hardware") expand the "Ports (COM & LPT)" entry and you
should see "Gadget Serial" listed as the driver for one of the COM
ports.
Use Hyper Terminal or Putty to open this serial port.
On the FOX side you can open /dev/ttyGS0 for example using minicom -s
to send chars.
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