On Wed, 9 Jun 2010, Florian Echtler wrote: > Correct, but unfortunately, the parallel port is a dying species. Just > out of curiosity: would such semi-accurate timing be at all possible > with USB, or is that already excluded by the spec itself? How accurate do you mean? It depends on what signals you want to regulate. > (Quick summary: the question is whether it would be possible to time the > reset pulses on two hub ports so they occur with reliable and > significant overlap). It is not safe to reset multiple devices on the same bus at the same time. The Linux hub driver won't allow you to reset multiple devices at the same time even if they aren't on the same bus, although that could be changed. Therefore to do this at all, you would have to unbind your hub(s) from the hub driver and send commands to them via usbfs or libusb. The timing could be regulated to a precision of about a millisecond. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
