Unable to get USB_OTG_HS host on PB14/PB15 on Nucleo board to react
I'm working with the NUCLEO -F 446ZE MB1137 B-01 development board. My goal is to make a Virtual Com Port tunnel, where I plug in PA11/PA12 (USB device) to a PC and PB14/PB15 (USB host) to another product my company makes. I want to use the full speed (12 MBits/s) on both USB peripherals. It was very straight-forward to get the USB device to work using STM32CubeIDE, but no matter what I do I can't get the USB host to work. To isolate the problem, I removed the USB device completely and I’m currently only focusing on the USB host. I've added some logging here and there (using a sw bit-bang UART) e.g. in USBH_UserProcess, USBH_CDC_ClassRequest, OTG_HS_IRQHandler and in case of errors in MX_USB_HOST_Init. I have set PG6 high (right after the call to MX_USB_HOST_Init) to enabled VBUS on the CN13 connector (and measured 5 V on the 4th pin on a micro-USB to USB-A-female connector) and LED LD8 shows green light and LED LD7 (over-current indicator) never lights up. I'm using HSE 8 MHz and I make sure to multiply and divide it properly so that USB gets 48 MHz in the clock tree. Still, it seems the firmware is not reacting at all when I plug something into connector CN13. I've tried plugging in my company’s product, an FTDI USB-to-serial cable, and an optical mouse (its LED on the bottom did not light up). Does anybody know what I'm doing wrong?
Connectivity USB_OTG_HS:
External Phy: Disable (grayed out)
Internal FS Phy: Host_Only
Activate_SOF: Unchecked
Activate_VBUS: Unchecked
Speed: Host Full Speed 12MBit/s
Enable internal IP DMA: Disabled
Physical interface: Internal Phy
Signal start of frame: Disabled
User constants: None
USB On The Go HS End Point 1 Out global interrupe: Unchecked
USB On The Go HS End Point 1 In global interrupt: Unchecked
USB On The Go HS global interrupt: Checked. Prio 5, subprio 0
PB14 USB_OTG_HS_DM n/a Alternate Function Push Pull No pull-up and no pull-down Very High
PB15 USB_OTG_HS_DP n/a Alternate Function Push Pull No pull-up and no pull-down Very High
USB_HOST:
Class For HS IP: Communication Host Class (Virtual Port Com)
Class For HS IP: Disable (Grayed out; I can’t select anything else)
USBH_MAX_NUM_ENDPOINTS (Maximum number of endpoints): 2
USBH_MAX_NUM_INTERFACES (Maximun number of interfaces): 2
USBH_MAX_NUM_SUPPORTED_CLASS (Maximun number of supported class): 1
USBH_MAX_NUM_CONFIGURATION (Maximun number of supported configuration): 1
USBH_KEEP_CFG_DESCRIPTOR (Keep the configuration into RAM): Enabled
USBH_MAX_SIZE_CONFIGURATION (Maximun size in bytes for the Configuration Descriptor): 256 bytes
USBH_MAX_DATA_BUFFER (Maximun size of temporary data): 512 bytes
USBH_DEBUG_LEVEL (USBH Debug Level): 0: No debug message
USBH_USE_OS (Enable the support of an RTOS): Enabled
USBH_PROCESS_PRIO (The CMSIS-RTOS osPriority value specifies the priority for the USB Host thread): priority: normal (default)
USBH_PROCESS_STACK_SIZE (The CMSIS-RTOS stack size requirements in words): 128
Drive_VBUS_HS GPIO Output PG6 [USB_PowerSwitchOn[STMPS2151STR_EN]]