[Libusb-devel] usb_control_msg() timeout error

[Lloyd R. <Llo...@co...>]

Hello,
   I currently have some working USB code from the USRP fusb library.  I wanted
to compare the transfer rate of my device to that of libUSB.  I can currently
acheive ~40MB/sec using fusb library.  I am getting a "Connection timed out"
error, and wanted to check to see if I was using the correct order for my
function calls.

I do the standard issue:

usb_init();
usb_find_busses();
usb_find_devices();

... and can easily find my device on the bus.

My device has
interface0: command using ep0
interface1: reads using ep2
interface2: writes using ep6

so I then make a calls to usb_claim_interface() with no errors.  I am assuming
the order in which I claim interfaces does not matter, and that all 3
interfaces should be claimed, because I am claiming them all.

I then make a call to usb_control_msg() which is identical to the call in the
USRP code.

usb_control_msg(drx_dev_handle,VRT_VENDOR_IN,VRQ_XFER,0,0,0,0,1000);

where (if this even matters)
#define VRT_VENDOR_IN 0xC0
#define VRQ_XFER      0x01

I have little doubt this stalls ep0, I would get an EPIPE error if it does.

This is all consistent with my firmware for my fx2 chip.

Is this the correct way to send a control msg to a usb device?

Thanks in advance.

Take Care,
Lloyd