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arilink
Associate III
September 29, 2021
Question

HID IN data transmission frequency is only about 10 times per second

  • September 29, 2021
  • 1 reply
  • 1459 views

I used ThreadX and USBX in the project. When I only use USB as a HID Device, STM32 can transmit data to the PC 1000 times per second, but when I use USB as a CDC+HID composite device, the transmission frequency of HID is greatly reduced. Will increasing the CDC only 10 times per second affect the transmission frequency of HID? Why is there such a phenomenon?

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1 reply

Pavel A.
Super User
September 29, 2021

Check the HID polling interval parameter in the device HID descriptor.

arilink
arilinkAuthor
Associate III
September 29, 2021

HID polling interval parameter is 1ms

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Pavel A.
Super User
September 29, 2021

Try 11 ms (while waiting for better answers)