STM32U5A5 USB Host with USBX: CONNECTION Event Triggered but No Device INSERTION
Hello,
I have a custom board based on the STM32U5A5 microcontroller. I am trying to run a fingerprint reader sensor over USB on this board. For this project, I am using USBX Azure RTOS.
The configurations I made on the CubeMX side are as follows:
High Speed Clock: Crystal/Ceramic Resonator
LPUART1 for UART communication:
Mode: Asynchronous
Baudrate: 115200 Bits/s
PB10 -> LPUART1_RX
PB11 -> LPUART1_TX
USB_OTG_HS Mode and Configuration:
Internal HS PHY -> Host Only
PA11 -> USB_OTG_HS_DM
PA12 -> USB_OTG_HS_DP
Active_VBUS -> Disable
NVIC Settings -> USB OTG HS Global Interrupt: Enabled
PA9 GPIO Output enabled for USB power (I verified that the device is powered correctly.)
THREADX Mode and Configuration:
Core: Enabled
USBX:
Core System -> Enabled
UX Host HS -> Host CoreStack HS: Enabled
Host Controllers HS: Enabled
HID:
Core: Enabled
Keyboard: Enabled
Mouse: Enabled
Clock Configuration:
OTG HS Clock Mux: PLL1P enabled and set to 24 MHz (I also tried 16 MHz)
Project Manager:
Toolchain: STM32CubeIDE
MCU Reference: STM32U5A5ZJTxQ
Firmware Package Name and Version: STM32Cube FW_U5 V1.8.0
After these configurations, I generated the code. Then I enabled the GPIO for USB power output and verified that 5V is present on the USB line.
I also added some UART debug prints inside the ux_host_event_callback function in app_usbx_host.c.
After that, I connected several USB devices including:
the fingerprint sensor,
a mouse,
and a keyboard.
In all cases, the ux_host_event_callback function enters the CONNECTION event state, but it never reaches the INSERTION section.
At first, I thought the issue was related to the fingerprint sensor itself. However, seeing the exact same behavior with both the mouse and keyboard made me suspect that the problem is elsewhere. At this point, I am not sure what else I should try.
Does anyone have any suggestions or ideas about what could be causing this issue?
Best Regards,
Faruk