Is that possible to control the polling rate of a mouse in USB host mode?

[ZIgon.1]

HI,

I'm using an STM32F4 device and CubeIDE SW to interface with a mouse as a host with an HID. I use the USBH_HID_EventCallback function to trigger mouse readings.

Can I change the mouse's polling rate so that it will be triggering faster?

The current polling rate (per USBH_HID_GetPollInterval function) is 10ms. In the mouse's data sheet, it states it can reach 1kHz polling rate.

Thanks

[ZIgon.1 · Accepted solution]

Thanks again guys for your huge help!

So at the usbh_hid.c file, there is a section of HID_Handle initiation. On line 197, the systems gets the default polling rate for the device and verifies it is not shorter than the minimum value, as seen below:

 HID_Handle->poll   = phost->device.CfgDesc.Itf_Desc[interface].Ep_Desc[0].bInterval;

 if (HID_Handle->poll < HID_MIN_POLL)

 {

  HID_Handle->poll = HID_MIN_POLL;

 }

After these lines, I just add an overwriting value for the polling rate and it works.

Example: HID_Handle->poll = 1U; (for a 1ms polling rate).

Thanks again 🙂