Thanks to everybody for replying so quickly,
In this Email I will give a brief summary of what possebilities there are and what we are planning to do.
We are going to use the CY7C68013 ("FX2"). According to chapter 9 of the reference manuel [1] it got a nice mode called "Auto in". In that mode data is automatically streamed in by the external logic and send in USB packets, without any intervention by the CPU. A listing on how to enable that mode is also given in [1]. On the linux side there are two ways of accessing the USB subsystem. The easy way is libusb [2]. The more diffecult, but probably more reliable way is writing a kernel driver (see kerneldoc [3], [4], [5]).Two groups allready worked with that chip and have sucessfully run first tests (see [6] and [7]). The fimware for that chip can be compiled using sdcc [8] and downloaded into the chip using fx2programmer [9].
Yours Dirk
References: [1] http://www.keil.com/dd/docs/datashts/cypress/fx2_trm.pdf [2] http://libusb.sourceforge.net/ [3] http://www.kernel.org/ [4] http://www.xml.com/ldd/chapter/book/ [5] http://wwwbode.cs.tum.edu/Par/arch/usb/usbdoc/ [6] http://www.atlas.uni-wuppertal.de/~dopke/wodan2/ezusb.html [7] http://volodya-project.sourceforge.net//SR/SR-1/sr1.php [8] http://sdcc.sourceforge.net/ [9] http://volodya-project.sourceforge.net//fx2_programmer.php
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