[wdmaudiodev] Re: DMA mode?
- From: Tim Roberts <timr@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Tue, 11 Aug 2009 16:49:52 -0700
Pallavi Joshi wrote:
>
> I am developing an ASIO driver using kernel streaming. To increase the
> audio latency, ...
Do you mean "decrease" the audio latency? ;)
> ...I want to use DMA (Direct Memory Access) for communication between
> my device and my ASIO driver. In my ASIO driver, I am using the
> DeviceIoControl function with IOCTL_KS_READ_STREAM and
> IOCTL_KS_WRITE_STREAM as the control codes for reading/writing data
> from my USB audio device. Thus, I need to figure out a way which can
> operate my USB audio device in the DMA mode. Note that I am using
> kernel streaming pins here, thus there might be a way of telling the
> kernel streaming filter to operate in the DMA mode. I haven't been
> able to figure out how to do that though.
All USB transactions use DMA. It's required by the USB host controller
specifications.
--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.
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