What PIC do I need? (USB to cell phone)

runtime · Joined: 15 Sep 2003 Posts: 36

Hello List,

I need to do an interface between a cell phone (Siemens A56) for which I have a data cable (USB). I need to send AT commands to the phone, I've done this using RS232 cable but now I would like to do it through the USB cable.

What PIC do I need to use?
Does CCS supports USB?

Max baud rate would be 9600

Best regards
Peter

William H. Conley III · Joined: 27 May 2004 Posts: 17 Location: Tucson, AZ

CCS has examples....

Most any pic would work, you need an exteranl USB driver.
I would recommend the PIC18FXXX

-bc

dbotkin · Joined: 08 Sep 2003 Posts: 197 Location: Omaha NE USA

The fun part will be figuring out how to play USB host. If all you need to do is see the phone connected and send one string, or do the same sequence of actions, you may be able to get by with faking just enough of the process to make the device think it's connected to a "real" host.

The CCS USB examples don't handle the host end of USB, but if you read through them you can gete some pretty interesting insight into what the USB device expects to see from the host.

You will probably want to buy a copy of USB Complete: Everything You Need to Develop Custom USB Peripherals by Jan Axelson before you get very far into this. It's not a simple plug-in-and-go thing like serial.