• State Not Answered
  • Locked Locked
  • Replies 8 replies
  • Subscribers 20 subscribers
  • Views 1932 views
  • Users 0 members are here
Options
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

USB HID Control Transfer Speed Vary Issue

jrzs ssrs

Hi, Don't know if it is proper to post here.

Currently I'm on a project with USB HID function. The function works well without any error except that the USB HID has speed vary issue. The speed will vary depending on host PCs.

Using USB View, I found that for fast speed, the device has been assigned to be controlled by USB2 Enhanced Host Controller(EHC) Full Bus Speed, however, for slow speed, the device has been assigned to be controlled by USB Universal Host Controller(UHC) Full Bus Speed(Same Hardware&Firmware).

The confusing thing is what makes the host controller decides that the device should be assigned to be controlled by EHC or UHC.

Any idea and suggestions for this issue?

Thanks.

0