STM32F7 USB Device Not Recognized as Virtual COM Port (VCP)

[Rlakos]

Hello everyone,

I’m working on an STM32F7 project where I’m trying to establish USB communication between my STM32F746 Discovery board and a PC. I am really new at this really first time. I have configured the board for USB_OTG_FS in STM32CubeMX, and I’m trying to use it as a Virtual COM Port (VCP). However, when I connect the board to the PC using the USB_FS port, it’s not being recognized as a COM port or any device at all in the Device Manager.

The only time I see a COM port is when I connect the ST-Link USB, which shows up as a Virtual COM Port. I have already:

1. Enabled the USB_DEVICE in STM32CubeMX and selected the CDC class.
2. Generated the code and set up the USB_DEVICE middleware.
3. Tried with different USB cables to rule out a cable issue.
4. Checked the board configuration, and the USB pins are correctly assigned.

Additionally, I configured the board to flash an LED to confirm it’s functioning, which works fine. My goal is to transfer files between the app I am currently developing and the STM32 board through USB.

I would really appreciate any suggestions or guidance on:

1. Getting the board to show up as a VCP in the Device Manager.
2. Troubleshooting USB enumeration issues.

Thanks in advance!

[Pavel A.]

Start from some ready example in the ST Cube package. Do not trust CubeMX to generate a working project automatically.

[Rlakos]

Thanks, but so far, I could not find any ready example using USB_DEVICE as a VCP, which is the one I need since the board is going to be communicating and receiving files from the app. Do you know of any examples?

[FBL]

Hi @Rlakos 

You can start with this example for F756 eval board

STM32CubeF7/Projects/STM32756G_EVAL/Applications/USB_Device/CDC_Standalone at master · STMicroelectronics/STM32CubeF7 (github.com)

[waclawek.jan]

What's the primary clock source?

If internal bootloader is run (using BOOT0 pin), does the board connect as DFU?

JW

[Sanyam_07]

I am using STM32F407G-DISC1 board am i am facing the same problem

[FBL]

Hi @Sanyam_07 

 

Given that your hardware setup differs from the existing discussion, I recommend starting a new thread where you can clearly outline the issue you're facing. If possible to attach your failing project to narrow down the issue.