Found a solution!
I've already tried basic debugging before, but JW motivated me to at least dig and find the function which maybe stucks (thanks!).
So, no matter what configuration and combination, Host, Device, any class or no-class, I wouldn't go past the USB_CoreReset() funtion in CoreInit().
The CSRST bit in GRSTCTL register was set, but didn't clear by itself and the function always timed out.
As register operations before the core reset seemed fine, i was fighting a little with init structure fields, but then I figured out, that none of them matter, until the core is reset.
Then in HAL_PCD_MspInit() function, generated by MX, i've found that there are 2 clocks enabled instead of 1:
(...)
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* Peripheral clock enable */
__HAL_RCC_USB_OTG_HS_CLK_ENABLE();
__HAL_RCC_USB_OTG_HS_ULPI_CLK_ENABLE(); <--- ????
/* USER CODE BEGIN USB_OTG_HS_MspInit 1 */
(...)
At first, i've left it default as i thought it's needed or doesn't matter, but when i commented 6. line above, everything started to work fine.
That's the fix, just remove: __HAL_RCC_USB_OTG_HS_ULPI_CLK_ENABLE();
I feel a fool right now, cause i have no idea, why i didn't dig a little deeper to find it earlier (laziness?) ... seems so easy and obvious now.
Anyway, I hope to get it fixed in next MX releases, so no one get stucked on this anymore =)
