i.MX ProcessorsのトピックImx6Q usochronous transfer

Imx6Q usochronous transfer

binaeksarkar — Thu, 09 Apr 2015 12:24:15 GMT

Hi,

I am using imx6q usb as device controller. I configured end point 2 as isochronous out by writing appropriate endpoint control register. I am playing 44.1khz, 24 bit, stereo,wave fil;e from Windows media player.( bInterval set to 1 ms). In the device side I have performed the following steps.

Prepare dtd with a 272 bytes of buffer
Link dtd with isochronous out dqh.
prime isochronous out end point.

But we do not see iso out endpoint completion interrupt. Please let me know if I am missing something.

Thank you in advance.

Thanks

Barindam

Re: Imx6Q usochronous transfer

binaeksarkar — Thu, 09 Apr 2015 12:28:17 GMT

Hi,

Is there any buffer start address alignment and buffer length restriction in dtd for imx6q usb device controller?

Thanks

Barindam

Re: Imx6Q usochronous transfer

igorpadykov — Fri, 10 Apr 2015 00:50:23 GMT

Hi Binaek

you are right, there are some alignment restrictions, from IMX6DQRM

p. 5391 The Endpoint Queue Head List must be aligned to a 2k boundary.

The dQH is a 48-byte data structure, but must be aligned on 64-byte

boundaries.

p.5418 Allocate 8-DWord dTD block of memory aligned to 8-DWord boundaries.

Best regards

igor