Compiler support for pic24 and USB

Ginko · Guest

Hi,
i got one project where i have to use PIC24FJXXX for USB connection.

The part of the connection that i need is:
USB Stick <----> HW device.
HW Device <----> PC

Main functions should be used.
Something like, read / write data from and to USB stick and HW device.
Send receive data from PC to HW device.

I am CCS fan so i hope that there is some stable compiler version to support this kind of project ?

Any suggestion is welcome !

bkamen · Posted: Tue Sep 15, 2009 3:51 pm

You need to look for a USB module on the PIC that supposed USB host mode.

I *think* that all PICs only support the USB end-point scenario.

I just looked on MAPS and considering the PIC24 series only comes with a maximum of 1 USB port, you'd be out of luck anyway for a design with 2 USB ports.

Now, you COULD make a PIC that behaves as a memory stick with the PIC communicating with a CompactFlash or SD card as the back end.

You might be re-inventing the wheel though.

-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D

FvM · Joined: 27 Aug 2008 Posts: 2337 Location: Germany

bkamen · Posted: Wed Sep 16, 2009 12:23 am

FvM · Joined: 27 Aug 2008 Posts: 2337 Location: Germany

While OTG is a generic term and a marketing slogan, dual-role device and embedded host are the technical terms used in the respective USB specifications. Basically, a dual-role device has a Targeted Peripheral List clarifying which devices are recognized. The said Microchip project e.g. has a standard USB mass storage device in it's list. So apart from the meaning of terms, PIC24FJxxxGB is able to serve a memory stick respectively "being a host to (this specific) normal USB end-point".

Ginko · Guest

I am planning to use dual role device.

USB Host - Mass Storage - Thumb Drive Data Logger is good example project. I don't know if it would be "easy" to rewrite it for use with CCS.
I am writing this because i tested the same project on the explorer16 demo board and C30. As far as i can tell, this is not simple or small library.

You have mention that CCS didn't provide example for such project.
Does this means that there are already done USB library's that we can use to rewrite this project to CCS code ?

Would it be hard to rewrite C30 demo code to use with CCS ?
What compiler version supports such library's ?

FvM · Joined: 27 Aug 2008 Posts: 2337 Location: Germany

Guest · Posted: Wed Sep 16, 2009 3:34 pm

But not impossible though. I would do, if needing dual-role capability. Fortunately I don't need it....
--Is there a way that you make something like this for the users of CCS, in very near future :-). As you can guess, i need this in very near future.
D.h. by the end of the month.

Is there some simpler example from CCS on how to use some of the libraries that are assocciated with USB communication. ?

FvM · Joined: 27 Aug 2008 Posts: 2337 Location: Germany

No, I surely won't in the near future.

CCS is providing a CDC (device) driver for PIC24. As far as I understand, it's basically working.

Ginko · Guest

OK.
I dont know, i can e-mail to CCS to see if they have some new example ?.

CDC (device) driver for PIC24
- Any other info regarding this driver ?
Do you know if someone used it ....

Ginko · Guest

Forget to ask.
Is it possible to make my project with CDC device driver ?

FvM · Joined: 27 Aug 2008 Posts: 2337 Location: Germany

All CCS USB examples (ex_usb_xxx), except for the USB bootloader, have an option to use the PIC24 hardware. I mentioned CDC (communication device class = USB serial), because it's the most versatile code, usable for a lot of real world applications.

A mass storage device driver would use the basic usb.c and usb.h part, the missing part must be coded from the scratch. An embedded host respectively dual-role driver could at best reuse part of usb.c, but is basically a new project.

Ginko · Guest

the missing part must be coded from the scratch
- How much of it ?