Hi all,
I have successfully built a sound capture card that runs at a given rate
off its own clock. I receive the stream and do some post-processing on it,
and I want to present this modified data to the user as a capture pcm.
I initially thought that snd_aloop would be the best idea, as I can
My DMA is configured with a debug mode in which it sends an a simple
increasing counter value in the format I wish to receive: an IRQ every
32Bytes (half-frame). it transfers 32KBytes of data, and then restarts from
it's original offset. This is tested in bare-metal mode as working.
I wrote my
that arecord has consumed the
data in dma_area, such that the user can rewrite to it?
On Mon, Jul 11, 2016 at 12:33 PM, Rob Nertney <r...@rob-otics.com> wrote:
> Thanks Lars.
>
> My problem with the DMA is that it doesn't support cyclic mode, but does
> support SG mode. I ha
.
On Mon, Jul 11, 2016 at 12:29 PM, Lars-Peter Clausen <l...@metafoo.de>
wrote:
> On 07/11/2016 09:10 PM, Rob Nertney wrote:
> > Hi all,
> >
> > Could I please get a sanity check on my hw_params?
> >
> > I have a DMA which is providing between 1-16 channels of
Hi all,
Could I please get a sanity check on my hw_params?
I have a DMA which is providing between 1-16 channels of 4 bytes/ch worth
of data as a frame. I get an interrupt to my driver every frame's worth of
data (64 Bytes). The data is S32_LE, 16000Hz.
My DMA has 2 buffers, PING and PONG. Each
I've build a card that is registered correctly as far as I can tell.
My hardware is:
static struct snd_pcm_hardware my_pcm_hw =
{
.info = (SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP_VALID),
.formats = SNDRV_PCM_FMTBIT_U8,
.rates
nsferred before I fire an IRQ. It uses a circular buffer descriptor ring.
>(And development questions belong on the alsa-devel list.)
I just requested access to that list, but haven't received approval yet.
Thanks again for all the help!
Rob
On Tue, May 3, 2016 at 1:50 AM, Clemens Ladisch &
