On Thu, 18 Aug 2005, Uwe Bonnes wrote: > However for mapping the interrupt mechanism available in the parport > framework to the USB layer I have no idea. In basic, the status register of > the SJA1000 needs to be polled at a high rate.1000 Hz would probably do, > like the time frame for non Full spped USB devices use.
Is that a typo? 1000 Hz _is_ the frame rate for full-speed USB. (High-speed USB uses microframes at 8000 Hz.) Hence a full-speed device with an interrupt endpoint whose period was 1 frame would be interrogated 1000 times per second. > When a certain > condition is met, the USB layer needs to react appropriate and needs to > inform higher levels. That will happen whenever the device sends a positive response to the periodic interrogation. > Is there already something like a parport framework for the USB layer? I > know about libusb, but it is in user space and has therefore some drawbacks, > but also some advantages... I'm not aware of anything like that. You may end up with no choice but to build your own tools. Alan Stern ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
