Dear All,
I am testing the demo project for the NUCLEO-C071 to implement the USB HOST CDC_ACM (USBX). Below are some doubts that arose after the initial tests:
After using the wizard to create the demo project 'Ux_Host-CDC_ACM', opening the .ioc file shows an error in the USBX configuration. In the 'Platform Settings' tab, the pin 'Drive VBUS_FS' is not defined. From what I understand, this should be the pin used by the library to enable the 5V power supply on the USB connector when in HOST mode. However, looking at the electrical schematic of the NUCLEO-C071, there is no pin available for this functionality! To supply 5V to the connector, there is the JP1 jumper (pin 7/8). The only way to avoid the error is to assign an unused pin! Isn't there a smarter way to avoid sacrificing a pin?
After resolving the error, without adding anything to the demo project, and having compiled and downloaded the program onto the NUCLEO board, any device I connect always results in the error "USB Device Enumeration failure." One of the device connected to the NUCLEO definitely implements a USB CDC. When connected to a Windows PC, it is correctly recognized, and I can work with it without issues using Teraterm. It is not a power supply problem; the board draws 200mA, and once connected, it seems to work correctly (LED and configuration via switch). However, it is simply not recognized by the NUCLEO.
Any suggestions?
Thanks.
