USB_DEVICE code can't work!

[Junde]

Hi there,

I am using STM32F429BIT6 and want to show the SDcard(connect with MCU by SDIO) as a Udisk on PC.

I can normally read/write the SD card by MCU with FATFS.

But after I added the USB config in CubeMx, the code is something wrong.

My CubeMX config is as follows:

As we can see, I enabled the USB log, but nothing output.

After debugging, I found the MCU is blocked in the while loop in USBD_GetEpDesc().

I don't know what that means, please help me. Thank you!

[FBL]

Hi @Junde 

The issue with USBD_GetEpDesc() might be due to incorrect endpoint configuration. Would you share your endpoint descriptor config? Could you share a minimum project to reproduce?  USBD_MAX_STR_DESC_SIZ should be adjusted to accommodate the longest string descriptor you plan to use. A typical value might be 256 bytes to ensure USB stack can handle the string descriptors without buffer overflows. Also, it seems FH_mount(&sDisk[0]) is your custom initialization. 

[Junde · Accepted solution]

Hi @FBL 

Thanks for your reply.

Finally I know the reason of mine project.

I am compiler the project with MDK compiler V6, this is NOT work for USB_DEVICE source code,

after I change to MDK compiler V5, everything is work well.