how can i improve speed of usb interrupt transfer

Discussion around product based on ARM Cortex M3 core.

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wavelets
Posts: 3
Joined: Thu Sep 24, 2009 4:45 pm

how can i improve speed of usb interrupt transfer

Fri Oct 16, 2009 11:47 am

I wanna test the high speed usb interface of SAM3.

On the microcontroller I use 2 endpoints for Interrupt in and out.

On pc I use the example of Winusb from http://www.lvr.com/winusb.htm

The device sends 1024Bytes to the PC. The PC can get the right data. But the speed is very low.

the device is recognized by pc as high speed device. In the oscillograph the microframe is right with a 125us interval.

"Bus Hound" shows that the phase IRP occupy the most time.

Where can be the problem?

Thanks in advance!
nat
Contact:
Location: Atmel Rousset
Posts: 60
Joined: Mon Feb 16, 2004 1:34 pm

Re: how can i improve speed of usb interrupt transfer

Fri Nov 13, 2009 12:34 pm

test post r
jmaygarden
Posts: 4
Joined: Thu Jan 07, 2010 7:10 pm

Re: how can i improve speed of usb interrupt transfer

Sat Feb 06, 2010 12:34 am

Don't use interrupt pipes

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