where do I start - usb camera with local storage

Roman Gavrilov

I am new to Linux, more so embedded Linux.

The project I have been assigned with is as follows:

Develop a DM365-based camera that will connect to the host system via USB, capable of taking a video of specified duration and then make the video clip available to the host system.

I am building it at the moment on DVEVM (Specturm Digital one) with DVSDK and community Linux.

I suppose using encode demo from DVSDK as the prototype is reasonable (please correct me if its not), so I plan to modify Encode demo to fit my needs.

The idea is to implement the device as composite USB device so it appear as a USB camera, USB External storage (flash drive) and some proprietary USB device for special commands (if needs to be).

Does that make sense?

As first step I plan to use File-backed Storage Gadget that comes with the DVSDK, and use files as communication devices to send commands, and return the results. Is this viable? Are there any pit falls to watch out for?

Second step is to implement separate USB point to allow non-file-based communication with the camera (note: I'm also new to USB technology), would web-cam USB profile be appropriate to execute "Take 10 secs video at 720x480 resolution, encode using h264, and store on-board as myvid1.264" command? or should I build a non-standard device for that?

Is "Linux-USB Gadget API Framework" a good place to start for building USB interface? or does DVSDK has something I could use?

Any pointers and ideas ARE appreciated

over 15 years ago

0 swami over 15 years ago

TI__Expert 7435 points

Roman,

TI already has the needed modules to enable your need. Pl. refer to the EUCDK product from Leopard Imaging. This already has the needed components UVC, File storage Gadget etc. integragted.

regards

swami

0 Ajay over 15 years ago in reply to swami

TI__Genius 9460 points

Roman,

The details are at,

http://focus.ti.com/apps/docs/mrktgenpage.tsp?contentId=70530&appId=79&DCMP=dm368edk_042110&HQS=Other+OT+eucdk-dm368prprod

Reagrds,
Ajay

0 Roman Gavrilov over 15 years ago in reply to swami

Prodigy 160 points

I talked to them, and they say its DVSDK 2.1 based, which used MontaVista tools chain and linux distribution.

As I understand it, I will have to get MontaVista subscription to compile the code that comes with EUCDK.

Is that correct?

MontaVista is super expensive, so I wont be able to use EUCDK - will I?

0 Jinh over 14 years ago in reply to Roman Gavrilov

Expert 2315 points

Can any of this code be used to make something run on a EVMDM365 in order to push PAL DV data out on the USB to be saved on an external device?

Thanks, Jinh T.

0 Mohammad Kapadia over 14 years ago

Prodigy 190 points

Hello Roman,

I am facing more similar difficulty as yours... I am using DM355 Leopard board and i want to develop same kind of project. In your case it is video streaming while in my case it is just a image. I want to take image from CMOS sensor controlled from PC.

Did you find any solution on interfacing USB control on the board from PC? I need guidance on this that how to proceed to have control on my device (right from kernel module insertion to image transfer to PC over USB). What kind of drivers i will have to develop?

Please guide me with this.

0 Roman Gavrilov over 14 years ago in reply to Mohammad Kapadia

Prodigy 160 points

No, haven't found complete solution. I'll probably give up USB and will replace the interface with Ethernet.

For your case check out projects here https://www.leopardimaging.com/Download.html

one of them is a demo project that uses leopard board as a USB camera. Source code is available from leoparddesign for a fee (~$700)

0 Marko Shink over 14 years ago in reply to Roman Gavrilov

Genius 3475 points

Hi Roman,

I use MontaVista5 tools to compile ECDK, which is ethernet version of EUCDK, so i think you can download toolchain from :

http://software-dl.ti.com/dsps/dsps_public_sw/sdo_sb/targetcontent/dvsdk/DVSDK_2_10/latest/index_FDS.html

It's probably the same that you use for DVEVM if you work with DVSDK2.1
For DVSDK 2.1 you can use MV5 tools, and for DVSDK 3.1 and 4 CodeSourcery toolchain, they are all also free versions.

Marko.

0 Mohammad Kapadia over 14 years ago in reply to Roman Gavrilov

Prodigy 190 points

Thanks Roman,

My present system is already working on ethernet but want to replace it with USB. Anyways Thanks.

0 Jinh over 14 years ago in reply to Mohammad Kapadia

Expert 2315 points

On the TI website it says the EUCDK comes with free source code. Is this code only free if you buy the EUCDK? I have lots of EVMDM365 to use this free software on and would like to know where I can get hold of it?

Thanks, Jinh T.

0 Roman Gavrilov over 14 years ago in reply to Jinh

Prodigy 160 points

You get source code if you purchase EUCDK. Or you can purchase it separately for $695 here -> http://shop.leopardimaging.com/product.sc?productId=42&categoryId=12

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where do I start - usb camera with local storage