Hi, I just started developing a driver for the USB 2.0 data acquisition board I just built. I based the driver design on usb-skeleton.c file. Everything is working fine so far, but I am having a throughput problem.
I am currently testing the device plugged into a USB 1 controller. When I do several back to usb_bulk_msg calls (64 byte writes), I notice each one takes about 1 ms to complete. I decided to probe the usb trace on the hardware. I noticed that even when the device and driver are idle, I see packets being transmitted every 1ms. I am showing my ignorance here, but what are these? Second thing I notice is that when I run these back to back bulk transfers, I don't see a burst off them on the O-scope. Each bulk transfer come at the same place following the "unknown" packets. This is what is slowing my bulk transfers down. How do a make my transfers use all available bandwidth and not just this one slot every 1 ms? Do I have to use a bunch of linked urbs? Thanks, Torry Akins Remote Sensing Lab University of Kansas ------------------------------------------------------- This SF.net email is sponsored by: Etnus, makers of TotalView, The debugger for complex code. Debugging C/C++ programs can leave you feeling lost and disoriented. TotalView can help you find your way. Available on major UNIX and Linux platforms. Try it free. www.etnus.com _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
