Experimental Physics and
Industrial Control System

Yuke Tian <[email protected]> · Fri, 09 Jan 2009 10:32:26 -0500

Emmanuel Mayssat wrote:
> Hello again,
>
> I am contemplating writing a low level linux driver to read a stream of
> data coming for custom made device and on a USB2 port.
> This data will be fed to linux and then to epics.
>
> Is anyone of you using epics with USB devices?
> Any pointers? Does asyn interface with usb ports readily?
>
> Regards,
> --
> Emmanuel
>
>
>
>
>
>
>
>   
Hi Emmanuel,

We used Opal Keely's USB-FPGA module (about $400) to bring data to
linux/epics through FPGA and USB port. The company provide a binary
library for Linux, but the source code is not open.  The USB
microcontroller on the module is Cypress's high speed USB controller
CY7C68013 (FX2) ($15).

There is an open source framework (xguff 
*http://recycle.lbl.gov/~ldoolitt/xguff.html*) developed by Larry
Doolittle at LBL will do the work (hardware data -- FPGA -- high speed
USB -- Linux -- epics).  It can support USB 2.0 and has all the source
code (host-side code, FPGA and USB firmware design) open.  It supports
the FX2 chip. We are planning to use this in one of our power supply
controller.

Hope this helps.

Yuke Tian
NSLS-II Control Group
Brookhaven National Lab

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System