I want to implement a can2usb device,what sub usb class should i use

hid or mass storage or others.
if i use hid class ,i should't to write the driver on my windows xp os or not? is there any speed limit of the hid sub class?
I use a STR710 EVAL board.
thanks!
cgha

 RE: I want to implement a can2usb device,what sub usb class should i use

The HID class has a speed limit of about 32KB/sec.

 RE: I want to implement a can2usb device,what sub usb class should i use

Thanks for your reply。
Yes，the HID has it's speed limitation，but I don't wan't to write a windows driver which is too difficult for me。I'v also checked the cdc class and found nothing,it is dedicated to serial 232 and NIC though the bulk transfer can be used.
Since it is just a hobby project,the speed is not the main thing taken into account.
Regards

cgha

 RE: I want to implement a can2usb device,what sub usb class should i use

Maybe this could be interesting for you:

http://www.ftdichip.com/

They provide RS232 to USB coverter ICs and also parallel to USB.
The drivers are ready to use and for free.