`UsbSyncInterruptTransfer` Modifies the Endpoint Number

["Ali Shirvani" <aj.shirvani@gmail.com>]

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Hi all,

I tried to send some data from the host to a HID USB device via interrupt
out endpoint. I used following snippet to send data synchronously:

UsbIo->UsbSyncInterruptTransfer(UsbIo, *0x01*, TestData, &DataLen, 1000,
&Result);

I captured the USB packets, but the endpoint number in the captured file
differs from the endpoint number, *0x01*, that I passed as an argument to
the `UsbSyncInterruptTransfer` function. The endpoint number in the capture
file is *0x81*.

Here is the capture file:

Frame 19: 64 bytes on wire (512 bits), 64 bytes captured (512 bits)
USB URB
    [Source: host]
    [Destination: 0.1.1]
    URB id: 0x000000000720e0c0
    URB type: URB_SUBMIT ('S')
    URB transfer type: URB_INTERRUPT (0x01)
    Endpoint: *0x81*, Direction: IN
        1... .... = Direction: IN (1)
        .... 0001 = Endpoint number: 1
    Device: 1
    URB bus id: 0
    Device setup request: relevant (0)
    Only control URBs may contain a setup packet
        [Expert Info (Error/Malformed): Only control URBs may contain a
setup packet]
            [Only control URBs may contain a setup packet]
            [Severity level: Error]
            [Group: Malformed]
    Data: not present ('<')
    URB sec: 1611495093
    URB usec: 737320
    URB status: Success (0)
    URB length [bytes]: 0
    Data length [bytes]: 64
    [bInterfaceClass: HID (0x03)]
    Unused Setup Header
    Interval: 0
    Start frame: 0
    Copy of Transfer Flags: 0x00000000
        .... .... .... .... .... .... .... ...0 = Short not OK: False
        .... .... .... .... .... .... .... ..0. = ISO ASAP: False
        .... .... .... .... .... .... .... .0.. = No transfer DMA map: False
        .... .... .... .... .... .... ..0. .... = No FSBR: False
        .... .... .... .... .... .... .0.. .... = Zero Packet: False
        .... .... .... .... .... .... 0... .... = No Interrupt: False
        .... .... .... .... .... ...0 .... .... = Free Buffer: False
        .... .... .... .... .... ..0. .... .... = Dir IN: False
        .... .... .... ...0 .... .... .... .... = DMA Map Single: False
        .... .... .... ..0. .... .... .... .... = DMA Map Page: False
        .... .... .... .0.. .... .... .... .... = DMA Map SG: False
        .... .... .... 0... .... .... .... .... = Map Local: False
        .... .... ...0 .... .... .... .... .... = Setup Map Single: False
        .... .... ..0. .... .... .... .... .... = Setup Map Local: False
        .... .... .0.. .... .... .... .... .... = DMA S-G Combined: False
        .... .... 0... .... .... .... .... .... = Aligned Temp Buffer: False
    Number of ISO descriptors: 0

Would you please guide me how I should solve this issue?

Regards,
Ali

PS: The attached is the complete pcap file.

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