raspberry pi zero and SLOW USB HID

[Hans Petter Selasky]

On 2020-01-13 14:40, Wojciech Puchar wrote:
> thank you for the help i already got. Raspberry pi zero run now 
> completely with FreeBSD including USB.
> 
> Over this USB we connect our own hardware that looks like HID device. 
> Actually it's nothing like mouse or keyboard, but it's HID
> device so to be able to work under windoze without requiring user to 
> install any drivers.
> 
> Both raspberry pi and PC have 480Mbit/s USB. device actually works with 
> 12Mbit/s USB.
> 
> my program does lots of hid_read_timeout from this device
> 
> When running on PC it goes fast - able to perform enough reads to read 
> all needed data.
> 
> When running on raspberry pi - in spite of total CPU load is far less 
> than 5% - it is slow. all hid_read_timeout works properly but
> way too slow. every read takes like 10 times more time.
> 
> what is needed to fix this?

Hi,

Can you check the USB speed used between PC and RPI-zero ? Is one 
perhaps High-Speed, while the other is, Full-Speed?

If yes, try to connect a high-speed USB hub in between.

Output from:
usbconfig


You can also check using "usbdump -i usbus0 -s 65536" to see the actual 
timing of the commands.

--HPS