PC software for FPGA control through USB port

Thanks for all the information. It opens more and more options but it also rises more and more questions.

I have now 3 options : USB + control software, Ethernet + control software, Ethernet + webserver.

At the end, I think my product can live with any of these 3 options but further to your comments, I am now a lot in favor of the Ethernet options.

The main issue for me is now to identify THE solution which will be the fastest and easiest to develop (at a reasonible cost but not necessarly no cost).

The ideal situation would be if I can find a comprehensive package including low-level staff (drivers, stacks, etc...) on both PC and FPGA sides as well as some templates of web server or control applications which I could simply adapt/enrich to make my own.

In other words, since I am more an FPGA developper than a software developper, I would highly prefer to start from a working ensemble and modify it rather than trying to build or assemble a new one (unless it is quite straight forward without unknowns).

Thanks to all your tips, I have now identified the following potential solutions :

- USB approach

http://www.slscorp.com/pages/ipusb20sls.php

- Ethernet approach

http://www.altera.com/support/exampl..._tutorial.html (http://www.altera.com/support/examples/nios2/exm-micro_tutorial.html)

http://www.iniche.com/nios.php

http://www.sics.se/~adam/uip/index.php/main_page

http://www.micrium.com/products/tcp-..._download.html (http://www.micrium.com/products/tcp-ip/tcp-ip_download.html)

For those having experience in some of these and knowing now my target (find a ready-to-use/modify or straight forward and simple comprehensive solution), which one of the above options would you recommend ?

Note : this message was also posted in "Embedded web-server in FPGA" thread since it overlaps both threads.