4 ms·
Is it not possible to simply steer the USB pins high or low just like with a serial port?
by lutorm 16y ago
Is it not possible to simply steer the USB pins high or low just like with a serial port?
- kazuya 16y agoInteresting idea, but I believe it's very hard to trick the USB host controller into flipping pins as you intend.
- Murkin 16y agoNope, The controllers on both ends expect a fairly complex protocol (one which you have virtually zero control over - in software). Some hubs will allow you to selectively turn power on their ports (most just say they do). You can in theory stick leds there.
- lmz 16y agoUSB is a complex protocol, encoded using just two wires (the other two are power - +5V and GND). There are no pins you can steer high or low. See http://www.beyondlogic.org/usbnutshell/usb1.shtml http://www.beyondlogic.org/usbnutshell/usb1.shtml for more info.