Hi All
I am using Fitlet-i with Libusb-1.0 to do Control Transfers to a usb port that has an Industrial I/O board connected to it.
When doing this on my Laptop it takes 185 micro seconds to do a write to the board.
When doing this on The Fitlet-i it takes 700 micro seconds.
Although the Laptop is an Acer Aspire i5 1.6Ghz, I don't believe the speed of the Laptop should make that much difference.
It is the same software running on both, and using either usb 2 or usb 3 makes no difference. The only thing noticeable is that the square pulse varies significantly in width.
By doing a Write to set an output, and then immediately another Write to turn it Off results in a 700 micro second pulse on the Fitlet-i and 185 micro second pulse on my laptop.
Does anyone have any ideas.
Slow usb response
Re: Slow usb response
The structure of a USB host controllers is different in Intel and AMD platform. Especially if the device is USB1 (slow old device like mouse / keyboard etc).
If you would like to compare USB behavior, you should compare it with another AMD platform with all-in-one CPU, in which the USB controller is on the same silicon.
I wouldn't worry about the delays of several milliseconds in your case, it is normal behavior.
If you would like to compare USB behavior, you should compare it with another AMD platform with all-in-one CPU, in which the USB controller is on the same silicon.
I wouldn't worry about the delays of several milliseconds in your case, it is normal behavior.
Re: Slow usb response
Hi All
Thanks for your response.
Am I likely to get the same degraded performance if I change to Ethernet GPIO ?
Thanks for your response.
Am I likely to get the same degraded performance if I change to Ethernet GPIO ?
Regards
Re: Slow usb response
They have different structure.