Solution to the problem of STM32 VCP PC-side driver installation failure ---- tried and solved the problem-EEWORLD

Collect

STM32, when using USB VCP function, that is, virtual serial port function, select USB_OTG_FS Device_Only, as shown above. cube automatically generates the project without modification. Insert the USB into the computer, STMicroelecronics Virtual COM Port (COM4) can be successfully displayed in the port item of WIN10 or WIN7 system device manager, but a yellow exclamation mark is displayed before the driver, indicating a warning that there is a problem with the device installation.

question:

In the usbd_cdc.c file, there is a USBD_malloc in the USBD_CDC_Init function, which can be debugged by setting a breakpoint. pdev->pClassData is NULL, indicating that malloc did not apply for space.

Solution:

The reason why malloc fails to apply for space is not because of a problem with the USBD_malloc function, but because the system heap space is too small and the application space is larger than the heap space, so the application fails. You only need to increase the value of Heap_Size EQU 0x200 in the startup_stm32f429xx.s system startup file.

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Remark::

1> Run dpinst_amd64.exe under C:\Program Files (x86)\STMicroelectronics\Software\Virtual comport driver\Win8 under win10 to install the driver successfully-----the displayed serial port will not have an exclamation mark!!!

Keywords：STM32 Reference address：Solution to the problem of STM32 VCP PC-side driver installation failure ---- tried and solved the problem

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