How to send setup packet to USB control end point

Question

I have a USB device which has only one interface  that of USB mass storage. I need to send vendor specific data to the device as USB setup packets. How can I do this?

I could not find any IOCTL command for that except some for querryng informtion like descriptor.

I tried to send USBUSER_OP_SEND_ONE_PACKET request. But it fails with error - UsbUserFeatureDisabled.  This error may be due to following reason. In usbuser.h, it has already been stated that USBUSER_OP_SEND_ONE_PACKET enabled when the devlopr key is set in the registry. I could not find such a key and not sure where to add this.

Note : I could do this using "LibUsb-Win32" filter driver and its library. but I need to do this without a filter driver.

Answer 1

It is not the bus who send you response. It is the hardware who send the response. the USB cable is just a bridge. Contact the manufacture of the hardware if you want to know what kind of IO codes are supported by the hardware.

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Answer 2

1. 

I want to send only USB setup packet to control end point of the device. I was able to do this with the help of a filter driver to the same device. But I need to do without a filter driver. How do I do this from a user mode application?

2.

In usbuser.h, it has been stated that USBUSER_OP_SEND_ONE_PACKET enabled when the devlopr key is set in the registry. I could not find such a key and not sure where to add this. Any help on this?

Answer 3

1 you can not send arbitrary control code without knowing the device type. If the device does not validate inputs, unexpected behavior can happen, including hardware damage.

2 VC is not supported for driver development. If you need help in DDK, post to a DDK newsgroup.

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