Bugreport STM32CubeMX 4.20

For future reference :

2. Non working code USB MSC

Code generated for USB MSC stops working after the usb command USB Set Configuration Request

Device Manager reports Error Code 10 (can't start device)

The usb analyzer tool of wireshark shows no communication after host sends Set Configuration Request.

Problem observed from at least STM32CubeMX V4.18+

STM32CubeMx generates:

USBD_StatusTypeDef USBD_LL_Init (USBD_HandleTypeDef *pdev)
{ 
 /* Init USB_IP */
 if (pdev->id == DEVICE_FS) {
 /* Link The driver to the stack */
 hpcd_USB_OTG_FS.pData = pdev;
 pdev->pData = &hpcd_USB_OTG_FS; 
 
 hpcd_USB_OTG_FS.Instance = USB_OTG_FS;
 hpcd_USB_OTG_FS.Init.dev_endpoints = 6;
 hpcd_USB_OTG_FS.Init.speed = PCD_SPEED_FULL;
 hpcd_USB_OTG_FS.Init.dma_enable = DISABLE;
 hpcd_USB_OTG_FS.Init.ep0_mps = DEP0CTL_MPS_64;
 hpcd_USB_OTG_FS.Init.phy_itface = PCD_PHY_EMBEDDED;
 hpcd_USB_OTG_FS.Init.Sof_enable = DISABLE;
 hpcd_USB_OTG_FS.Init.low_power_enable = DISABLE;
 hpcd_USB_OTG_FS.Init.lpm_enable = DISABLE;
 hpcd_USB_OTG_FS.Init.vbus_sensing_enable = ENABLE;
 hpcd_USB_OTG_FS.Init.use_dedicated_ep1 = DISABLE;
 if (HAL_PCD_Init(&hpcd_USB_OTG_FS) != HAL_OK)
 {
 Error_Handler();
 }
 HAL_PCDEx_SetRxFiFo(&hpcd_USB_OTG_FS, 0x80);
 HAL_PCDEx_SetTxFiFo(&hpcd_USB_OTG_FS, 0, 0x40);
 HAL_PCDEx_SetTxFiFo(&hpcd_USB_OTG_FS, 1, 0x80);
 }
 return USBD_OK;
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if the following line is changed from:

hpcd_USB_OTG_FS.Init.dev_endpoints = 6;�?�?

to

hpcd_USB_OTG_FS.Init.dev_endpoints = 4;�?�?

the code start working again and my OS recognizes the device as mass storage.

is suspect that the set configuration command fails because there are an additional 2 uninitialized / unused endpoints

Please include the mentioned abnormalities in the next update