On Wed, Sep 22, 2010 at 11:02:46AM +0530, Raju Rameshwar Uprade wrote: > > > Greg, > I am facing some problem in data copying. > I am having a const unsigned char *buf which contains 02 08 00 00 00 00 00 00 f8. > which is copied in port->write_urb->transfer_buffer and sent on ttyUSB0 using > usb_submit_urb(port->write_urb, GFP_ATOMIC). For what driver? > But I want to send the data bytes is a particular fashion. > > 1. I want to Add Mark parity. That's a control signal and is independant of the data payload, right? > 2. Send the data byte 02 ( Address of a device ) That means you need to modify the data. Why not do that in userspace? > 3. Add Space parity . Again, control signal. > 4. send the data byte 08 00 00 00 00 00 00 f8 ( Null cmd + check sum ) Should be fine. > Kindly help me.I am facing the problem in separating the data bytes so > that I can send the data bytes separately using usb_submit_urb. It all depends on the driver you are using. Why not do all of this from userspace? That way it works on any device you are talking to. good luck, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
