On Thu, 28 Oct 2004, Axel Waggershauser wrote: > Hi, > > I have to write a custom driver for a FX2 based camera module that > should be able to reach a bulk throughput of about 30 MBytes/sec from > the device to user space memory. The available CPU performance is less > than a 1GHz VIA EDEN. Is the libusb capable to provide this performance? > > If not, I guess I would have to write a driver that definitely makes > usage of scatter-gather lists to avoid unnecessary cpu involvement, is > that right? Is there a good starting point (documentation/examples) for > a "state of the art" sg-based usb driver? > > Thanks, > Axel
I have no idea how fast libusb will run on your system, but it shouldn't be hard for you to test it. AFAIK the only driver that uses sg-based transfers is usb-storage. The sg library routines are called from with drivers/usb/storage/transport.c, and they are well documented in drivers/usb/core/message.c. Alan Stern ------------------------------------------------------- This SF.Net email is sponsored by: Sybase ASE Linux Express Edition - download now for FREE LinuxWorld Reader's Choice Award Winner for best database on Linux. http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
