USB Host High Speed HID_MIN_POLL Can not set to 1

[jim_hu]

I am using an STM32F405RGT6 and USB3300 to implement a USB Host for a keyboard. When I set hid_min_poll to 1, the keyboard is recognized but key presses are not detected. However, when I set hid_min_poll to 2 or higher, the keyboard works fine, and key presses are detected. What could be the reason for this?

[jim_hu]

Does anyone know how to solve the problem?

[jim_hu]

I change the code optimize level to O1, it seems work.