USB HOST Custom Class (0xFF) Bulk Endpoint

[martinchatgpt]

Hi ,
I want to communicate with USB device with Vendor Class , This device have 5 Endpoint include 4 Bulk and one Interrupt. I want just communicate to 4 Bulk endpoints. How can I communicate with it straight forward. the description of the device is here. Is there any solution?
I use some example from stm32cubmx to custom it for myself on stm32f746_discovery but I cannot get any success.

Connection Status Device connected
Current Configuration 1
Speed High
Device Address 12
Number Of Open Pipes 5

Device Descriptor DTV Modulator
Offset Field Size Value Description
0 bLength 1 12h
1 bDescriptorType 1 01h Device
2 bcdUSB 2 0200h USB Spec 2.0
4 bDeviceClass 1 00h Class info in Ifc Descriptors
5 bDeviceSubClass 1 00h
6 bDeviceProtocol 1 00h
7 bMaxPacketSize0 1 40h 64 bytes
8 idVendor 2 048Dh Integrated Technology.
10 idProduct 2 95XXh
12 bcdDevice 2 0100h 1.00
14 iManufacturer 1 01h "IXX Tech., Inc."
15 iProduct 1 02h "DX Modulator"
16 iSerialNumber 1 03h "AF0102020700001"
17 bNumConfigurations 1 01h

Device Qualifier Descriptor
Offset Field Size Value Description
0 bLength 1 0Ah
1 bDescriptorType 1 06h Device Qualifier
2 bcdUSB 2 0200h USB Spec 2.0
4 bDeviceClass 1 00h Class info in Ifc Descriptors
5 bDeviceSubClass 1 00h
6 bDeviceProtocol 1 00h
7 bMaxPacketSize0 1 40h 64 bytes
8 bNumConfigurations 1 01h
9 bReserved 1 00h

Configuration Descriptor 1 Bus Powered, 500 mA
Offset Field Size Value Description
0 bLength 1 09h
1 bDescriptorType 1 02h Configuration
2 wTotalLength 2 0035h
4 bNumInterfaces 1 01h
5 bConfigurationValue 1 01h
6 iConfiguration 1 00h
7 bmAttributes 1 80h Bus Powered
4..0: Reserved ...00000
5: Remote Wakeup ..0..... No
6: Self Powered .0...... No, Bus Powered
7: Reserved (set to one)
(bus-powered for 1.0) 1.......
8 bMaxPower 1 FAh 500 mA

Interface Descriptor 0/0 Vendor-Specific, 5 Endpoints
Offset Field Size Value Description
0 bLength 1 09h
1 bDescriptorType 1 04h Interface
2 bInterfaceNumber 1 00h
3 bAlternateSetting 1 00h
4 bNumEndpoints 1 05h
5 bInterfaceClass 1 FFh Vendor-Specific
6 bInterfaceSubClass 1 00h
7 bInterfaceProtocol 1 00h
8 iInterface 1 00h

Endpoint Descriptor 81 1 In, Bulk, 512 bytes
Offset Field Size Value Description
0 bLength 1 07h
1 bDescriptorType 1 05h Endpoint
2 bEndpointAddress 1 81h 1 In
3 bmAttributes 1 02h Bulk
1..0: Transfer Type ......10 Bulk
7..2: Reserved 000000..
4 wMaxPacketSize 2 0200h 512 bytes
6 bInterval 1 00h

Endpoint Descriptor 02 2 Out, Bulk, 512 bytes
Offset Field Size Value Description
0 bLength 1 07h
1 bDescriptorType 1 05h Endpoint
2 bEndpointAddress 1 02h 2 Out
3 bmAttributes 1 02h Bulk
1..0: Transfer Type ......10 Bulk
7..2: Reserved 000000..
4 wMaxPacketSize 2 0200h 512 bytes
6 bInterval 1 00h

Endpoint Descriptor 84 4 In, Interrupt
Offset Field Size Value Description
0 bLength 1 07h
1 bDescriptorType 1 05h Endpoint
2 bEndpointAddress 1 84h 4 In
3 bmAttributes 1 03h Interrupt
1..0: Transfer Type ......11 Interrupt
7..2: Reserved 000000..
4 wMaxPacketSize 2 0100h 256 bytes
6 bInterval 1 00h

Endpoint Descriptor 85 5 In, Bulk, 512 bytes
Offset Field Size Value Description
0 bLength 1 07h
1 bDescriptorType 1 05h Endpoint
2 bEndpointAddress 1 85h 5 In
3 bmAttributes 1 02h Bulk
1..0: Transfer Type ......10 Bulk
7..2: Reserved 000000..
4 wMaxPacketSize 2 0200h 512 bytes
6 bInterval 1 00h

Endpoint Descriptor 06 6 Out, Bulk, 512 bytes
Offset Field Size Value Description
0 bLength 1 07h
1 bDescriptorType 1 05h Endpoint
2 bEndpointAddress 1 06h 6 Out
3 bmAttributes 1 02h Bulk
1..0: Transfer Type ......10 Bulk
7..2: Reserved 000000..
4 wMaxPacketSize 2 0200h 512 bytes
6 bInterval 1 00h