received unexpected UX_DEVICE_REMOVAL from USB dongle

strayedboat · ‎2024-10-16

I ran Ux_Host_CDC_ACM project from https://github.com/STMicroelectronics/STM32CubeH5.git on STM32H573I-DK board, inserted an EC800G (Quectel LTE USB dongle) to STM32H573I-DK via USB port, expecting the STM32H573(USB CDC host) to control the EC800G(USB CDC device). However, I noticed that after the device was connected, a UX_DEVICE_REMOVAL event was triggered, which caused the CDC ACM object to be released. I'm not sure why this is happening. Below is the log from the STM32H573:

============================
Simple Interface initialized

PID: 0x3004
VID: 0x2ecc
CDC Data Interface initialized

UX_DEVICE_REMOVAL

MX_USBX_Host_Init OK !!!!!!!!
**** USB DRD CDC Host ****

USB Host library started.

Starting CDC Application
Connect your CDC Device

*** Device descriptor ***
bDescriptorType 1
bcdUSB 512
bDeviceClass 0x2
bDeviceSubClass 0x2
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x2ECC
idProduct 0x3004
bcdDevice 0
iManufacturer 1
iProduct 2
iSerialNumber 3
bNumConfigurations 1
*** Interface descriptor ***
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 0x2
bInterfaceSubClass 0x2
bInterfaceProtocol 0x0
*** Endpoint descriptor ***
bDescriptorType 5
bEndpointAddress 0x83
bmAttributes 0x3
wMaxPacketSize 10
bInterval 1
*** Interface descriptor ***
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 0xA
bInterfaceSubClass 0x0
bInterfaceProtocol 0x0
*** Endpoint descriptor ***
bDescriptorType 5
bEndpointAddress 0x2
bmAttributes 0x2
wMaxPacketSize 64
bInterval 0
*** Endpoint descriptor ***
bDescriptorType 5
bEndpointAddress 0x81
bmAttributes 0x2
wMaxPacketSize 64
bInterval 0
*** Configuration descriptor ***
bDescriptorType 2
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 4
bmAttributes 0xC0
bMaxPower 0

COMMAND_ACTIVATE
COMMAND_ACTIVATE

UX_DEVICE_INSERTION

USB CDC Device Found
PID: 0x3004
VID: 0x2ecc
Data Interface initialized

UX_DEVICE_CONNECTION

Simple Interface initialized

PID: 0x3004
VID: 0x2ecc
CDC Data Interface initialized

UX_DEVICE_REMOVAL

USB CDC ACM Device Removal

UX_DEVICE_DISCONNECTION

*** Device descriptor ***
bDescriptorType 1
bcdUSB 512
bDeviceClass 0xEF
bDeviceSubClass 0x2
bDeviceProtocol 1
bMaxPacketSize0 64
idVendor 0x2C7C
idProduct 0x6002
bcdDevice 792
iManufacturer 1
iProduct 2
iSerialNumber 3
bNumConfigurations 1
*** Interface Association Descriptor ***
bDescriptorType 11
bInterfaceCount 2
bFunctionClass 0x2
bFunctionSubClass 0x6
bFunctionProtocol 0x0
*** Interface descriptor ***
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 0x2
bInterfaceSubClass 0x6
bInterfaceProtocol 0x0
*** Endpoint descriptor ***
bDescriptorType 5
bEndpointAddress 0x87
bmAttributes 0x3
wMaxPacketSize 64
bInterval 16
*** Interface descriptor ***
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 0xA
bInterfaceSubClass 0x0
bInterfaceProtocol 0x0
*** Interface descriptor ***
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 0xA
bInterfaceSubClass 0x0
bInterfaceProtocol 0x0
*** Endpoint descriptor ***
bDescriptorType 5
bEndpointAddress 0x83
bmAttributes 0x2
wMaxPacketSize 512
bInterval 0
*** Endpoint descriptor ***
bDescriptorType 5
bEndpointAddress 0xC
bmAttributes 0x2
wMaxPacketSize 512
bInterval 0
*** Interface descriptor ***
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 0xFF
bInterfaceSubClass 0x0
bInterfaceProtocol 0x0
*** Endpoint descriptor ***
bDescriptorType 5
bEndpointAddress 0x82
bmAttributes 0x2
wMaxPacketSize 64
bInterval 0
*** Endpoint descriptor ***
bDescriptorType 5
bEndpointAddress 0xB
bmAttributes 0x2
wMaxPacketSize 64
bInterval 0
*** Interface descriptor ***
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 0xFF
bInterfaceSubClass 0x0
bInterfaceProtocol 0x0
*** Endpoint descriptor ***
bDescriptorType 5
bEndpointAddress 0x89
bmAttributes 0x3
wMaxPacketSize 64
bInterval 16
*** Endpoint descriptor ***
bDescriptorType 5
bEndpointAddress 0x86
bmAttributes 0x2
wMaxPacketSize 64
bInterval 0
*** Endpoint descriptor ***
bDescriptorType 5
bEndpointAddress 0xF
bmAttributes 0x2
wMaxPacketSize 64
bInterval 0
*** Interface descriptor ***
bDescriptorType 4
bInterfaceNumber 4
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 0xFF
bInterfaceSubClass 0x0
bInterfaceProtocol 0x0
*** Endpoint descriptor ***
bDescriptorType 5
bEndpointAddress 0x88
bmAttributes 0x3
wMaxPacketSize 64
bInterval 16
*** Endpoint descriptor ***
bDescriptorType 5
bEndpointAddress 0x81
bmAttributes 0x2
wMaxPacketSize 64
bInterval 0
*** Endpoint descriptor ***
bDescriptorType 5
bEndpointAddress 0xA
bmAttributes 0x2
wMaxPacketSize 64
bInterval 0
*** Configuration descriptor ***
bDescriptorType 2
bNumInterfaces 5
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xE0
bMaxPower 250

UX_DEVICE_CONNECTION

Composite Interface initialized

PID: 0x6002
VID: 0x2c7c
USB Device Enumeration Failure

============================

When the EC800G is plugged into a Windows PC, following ports can be observed:
device VID PID interface_number
Quectel USB Modem #2 2C7C 6002 MI_04
Quectel USB AT Port 2C7C 6002 MI_03
Quectel USB DIAG Port 2C7C 6002 MI_02
Mobile ECM Network Adapter 2C7C 6002 MI_00
Mobile Composite Device 2C7C 6002 5

I want access the USB AT Port with STM32H573, How can I do this?