[libusb] I have trouble with libusb_control_transfer

[손창범 <ckd...@gm...>]

Hello libusb team!

I'm dealing with usb headset(audio device).

I want to send libusb_control_transfer and failed with error code -9(error
pipe : people say usually it means stall(invalid parameter))
below is the contents

bmRequest Type

bRequest

wValue

wIndex

wLength

Data

10100001b

GET_CUR

GET_MIN

GET_MAX

GET_RES

Control Selector

(CS)

Terminal ID

and

Interface

Length of

Parameter

block

Parameter

block
bmRequest Type : 10100001= 0xA1
bRequest : 0x81 GET_CUR
wValue : COPY_PROTECT_CONTROL 0x0100
wIndex : 0x0100(0x01 :terminal ID  0x00 : Interface 0(alternate 0) )
wLength : 0x0001(1byte)
Data : I declared it like uint8_t data;
And my code here
r1 = libusb_control_transfer(dev_handle, 0xA1, 0x81, 0x0100, 0x0100, &data,
0x0001, 1);

can it be the Issues like byte_ordering(my VS is little_endian order)

Can you guys help me with correct this error?