×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

PCB Help & General Circuit Design

PCB Help & General Circuit Design

PCB Help & General Circuit Design

(OP)
Working on Devoloping a custom Device for the GP2x handheld.

It's uses are a wireless internet provider an SD storage device and have portable power. It Needs to act as a USB hub with these devices "plugged" in. (will be hardwired)

Heres what I need to know. SD to USB.... What do you need , IE.. controllers what else? Also can be purchased in small quantites at mouser or digikey.

RE: PCB Help & General Circuit Design

Do you have a specific question?  We're not here to put together a design for you... unless you intend to hire one of us.

Dan - Owner
http://www.Hi-TecDesigns.com

RE: PCB Help & General Circuit Design

Agreed Dan.

Also you need the file system firmware.  SD's want to talk a certain way about the file structure.  It would be easiest to locate a package that lets you use SPI to talk to an SD controller that talks to the actual SD.  Then you can use any SD, and when plugged into a PC it can directly read and write the same files.

Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com

RE: PCB Help & General Circuit Design

Agreed. You will hardly find whole projects here for free.

Anyway, you may start with a USB controller, a CPU and your SD memory. Allegro has some SPI/USB converter ICs to pass USB traffic to CMOS levels.
For CPU, you might use any cheap PIC, some AVR/ATmel, ARM or something that suits better your design.
As said before with SD memories, you need some  firmware 'drivers' on CPU to drive it and deal with filesystem.

Regards,
Gonzalo

RE: PCB Help & General Circuit Design

You can do a USB to SD interface in a single PIC procesor, and yes it can be bought at digikey.

Course you will need some software.  But its out there...just need to look for it.

RE: PCB Help & General Circuit Design

You may also try the FT232BM from FTDI, an USB-to-serial converter IC.  It could save you some code lines (USB driver) for your uC.

Good Luck!
Gonzalo

RE: PCB Help & General Circuit Design

you'll need a usb peripheral controller, and software to implement the mass storage protocol. Luckily, most manufacturers build single solution chips. I use the 8051 Atmel devices. They also provide plenty of software examples for USB implementation.

You might want to consider the compact flash for speed reasons.

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!


Resources