Hello, I’m porting USB HOST CDC function on stm32f411 discovery board, but it is not working.
Test environment. I connect the STM32F411 Discovery Board and CH340 USB serial Module, and send it repeatedly about 100 bytes in 5 sec.
Test procedure. 1. USB Host_Only, Communication Host Class setting in CUBEMX.
2. After download, when I connect the USB serial module, the message "USB Device Attached" is printed and "USB Device disconnected" is printed when removed.
3. After HOST_DEV_ATTACHED on USBH_Process(), ENUMERATION does not work.("Enumeration done.“ message isn’t printed)
4. No voltage is applied to the VBUS signal.
Please tell me how to solve this problem.
