stm32u575 CDC host and connection disconnection callbacks.

[picdev2]

I work using stm32u575 as a host for CDC devices , the problem I came across is that disconnection callback never called.
How tiny usb handle disconnection ? where in the code I must code.
Also I want to inform that I dont se vbus sense. Is this critical for disconnection ?

[picdev2]

After some searching I see that disconnection event is handle from GINTSTS register GINTSTS_DISCINT bit.
From the Reference manual:

OTG core interrupt register [alternate] (OTG_GINTSTS)
Valid for Host mode, see next section for Device mode.
Bit 29 DISCINT: Disconnect detected interrupt
Asserted when a device disconnect is detected.

On the code searching for GINTSTS_DISCINT there is a comment code on device interrupt handler.

void dcd_int_handler(uint8_t rhport) {
// TODO check GINTSTS_DISCINT for disconnect detection
// if(int_status & GINTSTS_DISCINT)

on void hcd_int_handler(uint8_t rhport, bool in_isr) I dont see any interrupt handle about disconnection event.

on static void handle_hprt_irq(uint8_t rhport, bool in_isr)
for disconnection callback the HPRT_CONN_DETECT is checked for HPRT register

from stm32u575 reference manual , about this bit, it looks like that does rise interrupt for disconnection:

OTG host port control and status register (OTG_HPRT)
Address offset: 0x440
Reset value: 0x0000 0000
Bit 1 PCDET: Port connect detected
The core sets this bit when a device connection is detected to trigger an interrupt to the
application using the host port interrupt bit in the core interrupt register (HPRTINT bit in
OTG_GINTSTS). The application must write a 1 to this bit to clear the interrupt.

[HiFiPhile]

Could you test U575-Nucleo board with device_info example ?

I don't have U575 board but U5A5-Nucleo, F723-DISCO and F407-DISCO all work correctly (tuh_umount_cb called on unplug)

These MCU covers Core ID from 0x1100 to 0x5000, also F723's FS port has the same CID (0x3000) as U575 so they should work in the same way.

[picdev2]

I will check if I can find the dev board,
U575 uses synopsis peripheral:

USB on-the-go full-speed (OTG_FS)
This section applies to STM32U575/585 devices only.

USB on-the-go high-speed (OTG_HS)
This section applies to STM32U59x/5Ax/5Fx/5Gx devices only.