Composite USB device MSC + Vendor

[MA4]

Hello,

I'm working on a firmware which currently run in USB vendor interface (bInterfaceClass = 0xFF) and it's working.

Now I want to add MassStorage. My Firmware is a bit older so I add all usb composite parte by my self (in usbd_core ...) . I defined USE_USBD_COMPOSITE and set :

#define USBD_CMPSIT_ACTIVATE_MSC 1

#define USBD_CMPSIT_ACTIVATE_CUSTOMHID 1

#define USBD_MAX_CLASS_INTERFACES 2U

#define USBD_MAX_SUPPORTED_CLASS 2U

#define USBD_MAX_CLASS_ENDPOINTS 2U

(I use custom HID class for the Vendor interface and I edited USBD_CMPSIT_CUSTOMHIDDesc )
I set Msc first 'cause I read that some OS prefer. 

Init function :

void MX_USB_DEVICE_Init(void)

{

#ifdef STM32H7xx

HAL_PWREx_EnableUSBVoltageDetector();

#endif //STM32H7xx

/* Init Device Library, add supported class and start the library. */

if (USBD_Init(&hUsbDeviceHS, &HS_Desc, DEVICE_HS) != USBD_OK)

{

DEBUG_PRINTF("[MX_USB_DEVICE_Init] USB failed to init \r\n");

}

//register classes

MassStorage_InstID = hUsbDeviceHS.classId;

USBD_RegisterClassComposite(&hUsbDeviceHS, &MassStorageDevice, CLASS_TYPE_MSC,MassStorage_EpAdress);

Usb_InstID = hUsbDeviceHS.classId;

USBD_RegisterClassComposite(&hUsbDeviceHS, &Usb_STM32xx, CLASS_TYPE_CHID, Usb_EpAdress);

if (USBD_CMPSIT_SetClassID(&hUsbDeviceHS, CLASS_TYPE_MSC, 0) != 0xFF)

{

if(RegisterStorage(&hUsbDeviceHS, &MassStorage_fops_HS) != USBD_OK)

{

DEBUG_PRINTF("[MX_USB_DEVICE_Init] register MassStorage interface failed to init \r\n");

}

}

//register interfaces

if (USBD_CMPSIT_SetClassID(&hUsbDeviceHS, CLASS_TYPE_CHID, 0) != 0xFF)

{

if (Usb_RegisterInterface(&hUsbDeviceHS, &Usb_fops_HS) != USBD_OK)

{

DEBUG_PRINTF("[MX_USB_DEVICE_Init] register Usb interface failed to init \r\n");

}

}

}

But when I run I feel like the first interface start (Msc) and then stop responding when the second try to start and when nothing works.

Does anyone have any idea what I'm doing wrong?

[MA4]

I didn't specify, but it's a Vendor type with two bulk endpoints (1 IN and 1 OUT).