I'm currently working with the STM32U5G9J-DK2 board, and as a newcomer to this board, I’m finding the USB CDC-ACM setup challenging. I’m using CubeMX 6.6.1 to generate the initial code, intending to send data over USB. However, I'm facing a few issues:
Dual USB Ports (ST-Link & Application USB): This board has two USB ports – one for ST-Link (for debugging and programming) and another for application USB. My PC detects the ST-Link port in Device Manager (showing as both a COM port and ST-Link Debug), but the application USB port is not recognized. I assume this port is where the USB CDC communication should be set up, but I’m unsure how to get it detected.
Lack of CDC Transmit Function: On other STM32 boards like the H7 series, there’s a CDC_Transmit_HS function that makes sending data relatively straightforward. However, I couldn’t find a similar function in the USB middleware for the STM32U5. I’m unclear on the exact steps for data transmission over CDC-ACM with this board.
Data Transmission Flow: Without the familiar functions from previous MCU series, I'm unsure about the correct flow or setup needed for USB data transmission here. Is there an equivalent function or a specific method for this board that I might be missing?
Any guidance from those who have worked with the STM32U5 series or similar setups would be greatly appreciated, especially on how to:
Enable the application USB port in Device Manager.
Properly configure and initiate data transmission using CDC-ACM.
Thanks in advance for any advice or resources!
