How do I programmatically send signals to USB?

[[email protected]]

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 .

 

[Nicholas Sherlock]

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 ?

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

 

[Homer J Simpson]

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 ?

There are books on how to use USB.

 

[John]

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 .

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

 

[Doug Miller]

On 30 Apr 2007 12:09:09 -0700, [email protected] wrote:

Think of what USB stands for
Universal
SERIAL
Bus

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.

 

[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.

USB uses 4 wires:
Power to device:
V+
V-

Data between devices:
Data+
Data-

No individual pins to control.

John

 

[Ken]

USB uses 4 wires:
Power to device:
V+
V-

Data between devices:
Data+
Data-

No individual pins to control.

http://www.usb.org/developers/docs/