×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Stealing signal

Stealing signal

Stealing signal

(OP)
Hi

I have been struggling for a while now to get my webcam to work while not attached to a pc, but to a DSP. I have to do this for a project, but can't figure it out. The webcam needs some or other initialization and probably a timing signal to operate. Somehow, I have to capture the initialization procedure that the computer software uses, and simulate it on the DSP, but I have no idea how I'm gonna do that. How can I "tap" or record the signal that the PC and the webcam says to each other during initialization and operation?

The setup is: webcam connected to a USB to parallel interface IC, and onto the DSP.

I contacted Logitech, but the tech support say they are not allowed to tell me anything.

Any help appreciated!
thanx

RE: Stealing signal

I had to do this with a mouse once (I think it was Logitech too).  Although I didn't get it to work completely, I did capture the computer/mouse initialization signal.  I just wired up the computer's mouse port to a digital logic analyzer, turned on the computer, and read the signal directly.  In your case, I imagine you'd need to find/make some USB to parallel adapter that will expose each of the individual wires.  Then you can tap each of the exposed wires with a digital logic analyzer.  If you don't have a digital logic analyzer, you can maybe use a 2 oscilloscope, and measure the signal (or lack of) in all the wires individually.  Then you can chart out the combined signal on graph paper.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close