Can USB BULK speed get higher?

chia · ‎2007-01-08

Posted on January 09, 2007 at 07:57

chia · ‎2011-05-17

Posted on May 17, 2011 at 09:35

Hi, Experts,

I have modified the STR9 USB HID demo into a BULK trasmit program. And it works. But the transmiting speed is only 130KB/s. As we know, USB 2.0 Fullspeed can come to 1.5MB/s (12Mb/s).

I have tried some ways. It turns out, the driver on PC doesn't limit the speed, because without driver, the USB HOUND can't get a higher speed either. In addition, I have made the STR9 run in 48MHz and 96MHz. But it worked the same. Furthermore, I tried single buffer transmit and double buffer transmit; but it turns out no different.

Why is the speed is so low? Can you advise me some reasons and solutions?

Thanks you very much!

email:

mailto:chia.joey@gmail.com

anis23 · ‎2011-05-17

Posted on May 17, 2011 at 09:35

Hi sparkman,

Could you tell me how did you modify the HID example to get the BULK transfer??? I have already tested the STR91x (Bulk with 96 MHz) and I retch the PC host limitation (All IN and OUT packets are served by the device without any NAK!!!!)...

Could you provide me more details about your software and your PC driver???

With Best Regards

AnisAS :)