On Sat, Jun 28, 2003 at 12:37:10PM +0300, Danny Braniss wrote: > [...] > > have fun. the mindshare book is good. however, it took me a long > > time to get a usb 'aha' moment and understand its twisty maze was > > really a workable design obscured by standardese... I suspect it is a > > problem in the usb chipset driver for the com part. ttypoll just says > > 'you have data in the buffer' so for some reason the data isn't making > > into the tty buffer. > > > > Warner > > Im amazed at how some of you can write a driver based on the Spec. Docs! > > here is a pearl i came across reading the USB spec for 1.1, page 43 > > 'The maximum allowable interrupt data payload > size is 64 bytes or less for full-speed.'
The device will tell you his personal limits for the given endpoint. See wMaxPacketSize in usb_endpoint_descriptor_t. The specs only tell you that a device can't tell >64 byte as the maximum for an interrupt endpoint. -- B.Walter BWCT http://www.bwct.de [EMAIL PROTECTED] [EMAIL PROTECTED] _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
