Hello
How do I control voltages to pins of the USB programmatically? For example, I'd like to say send a signal to individual USB pins (if that's applicable in USB) how do I do that ?
Also what's the appropriate newsgroup for this question? Thanks .
How do I programmatically send signals to USB?
Apr 30, 2007
6 Replies
AFAIK, you don't get to. The USB interface has (IIRC) D+, D-, +5v and ground lines. Your operating system will let you send streams of serial data, on the data lines, but nothing else. It sounds like you might be better off investigating parallel ports.
Cheers, Nicholas Sherlock
There are books on how to use USB.
Think of what USB stands for Universal SERIAL Bus
Think of it as another network connection, where you either have a connection or no connection and the information/control is in the bitstream.
John
I'll admit to knowing next to nothing about USB, but there's nothing inherently wrong with wanting to send a signal to individual pins in a serial connector. Think about RS232 -- only pins 2 and 3 carry data; 6, 7, 8, and 20, among others, are used for signaling equipment states.
Regards,
Doug Miller (alphageek at milmac dot com)
It\'s time to throw all their damned tea in the harbor again.
USB uses 4 wires: Power to device: V+ V-
Data between devices: Data+ Data-
No individual pins to control.
John
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