On 8/27/2023 7:49 PM, Nathan Hartman wrote:
I don't know whether you've had a chance to read [1] yet, but if not, it
might help visualize the two-part structure of device drivers in NuttX. (If
you've already read it, then never mind, and apologies for the noise. :-)
The audio subsystem is di
On Sun, Aug 27, 2023 at 6:24 PM Tim Hardisty wrote:
> SAMA5D2 specific, I should add.
>
>
> > On 27 Aug 2023, at 23:23, Tim Hardisty wrote:
> >
> > The classD driver DOES register itself as /dev/audio/pcm0, and works
> correctly as such with nx_player.
> >
> > The conversions are wav (or mp3 et
On 8/27/2023 4:24 PM, Tim Hardisty wrote:
SAMA5D2 specific, I should add.
There is no support for the Class D driver for any SAMA5D2 board in the
source tree.
On 8/27/2023 4:22 PM, Tim Hardisty wrote:
The classD driver DOES register itself as /dev/audio/pcm0, and works correctly
as such with nx_player.
You are mistaken. The Class D driver does not register itself as a
character driver. grep -r register_driver arch/arm/src/sama5/ proves
that is
SAMA5D2 specific, I should add.
> On 27 Aug 2023, at 23:23, Tim Hardisty wrote:
>
> The classD driver DOES register itself as /dev/audio/pcm0, and works
> correctly as such with nx_player.
>
> The conversions are wav (or mp3 etc) to pcm.
>
> Don’t if we’re talking cross purposes or the clas
The classD driver DOES register itself as /dev/audio/pcm0, and works correctly
as such with nx_player.
The conversions are wav (or mp3 etc) to pcm.
Don’t if we’re talking cross purposes or the classd driver works in a way it
shouldn’t!!!
> On 27 Aug 2023, at 23:00, Gregory Nutt wrote:
>
> A
Also, I don't think the /dev/audio/pcm0 device you are talking about is
what you think it is. It is a character driver but not the Class D
lower half. So, yes it can be opened.
/Caveat: It has been ages since I worked with the audio subsystem so I
might be completely wrong./
/dev/audio/pc
I suppose that the easiest thing of all would be to put the tones in
small PCM files in a built-in ROMFS file system
On 8/27/2023 1:47 PM, Gregory Nutt wrote:
On 8/27/2023 5:41 AM, Tim Hardisty wrote:
Or am I completely missing the point and I just need to use the nxaudio
system!!??
I think
On 8/27/2023 5:41 AM, Tim Hardisty wrote:
Or am I completely missing the point and I just need to use the nxaudio
system!!??
I think you have been missing point. You have two options:
1. As you suggest, extend nxaudio to be a source of tone data (just
like audio file data) and uses the
On 8/27/2023 5:25 AM, Tim Hardisty wrote:
Looking a little more at the write function of audio_ops_s it is not used by
any existing driver and is documented to be for device-specific
information...so it is not portable in terms of playing tones by simply writing
PCM data word by word. I get
On 8/27/2023 4:17 AM, Tim Hardisty wrote:
Thanks Gregory. The existing ClassD driver is registered as /dev/audio/pcm0 and is a PCM
device not PWM. It has the "usual" audio ops to configure it,
start/stop/pause/enqueue etc. It is exposed via ioctls so does have a user interface;
that is how b
Or am I completely missing the point and I just need to use the nxaudio
system!!??
On 27/08/2023 12:25, Tim Hardisty wrote:
Looking a little more at the write function of audio_ops_s it is not used by
any existing driver and is documented to be for device-specific
information...so it is not po
Looking a little more at the write function of audio_ops_s it is not used by
any existing driver and is documented to be for device-specific
information...so it is not portable in terms of playing tones by simply writing
PCM data word by word. I get that now.
So I'm thinking the right way is po
Thanks Gregory. The existing ClassD driver is registered as /dev/audio/pcm0 and
is a PCM device not PWM. It has the "usual" audio ops to configure it,
start/stop/pause/enqueue etc. It is exposed via ioctls so does have a user
interface; that is how buffers of audio are passed to it. Is that an
Sort of perhaps. The SAMA5D@ needs lots of setting up and the existing driver
does that with all the usual audio device ioctls and enqueue methods: it works
just fine using nxplayer and can playback .wav files etc.
But it it is based on creating buffers of audio - the assumption being that you
Thanks Gregory. I looked at that but it produces tones using PWM. The
ClassD of the SAMA5D2 is a PCM device, so not an immediately obvious match?
On 26/08/2023 23:17, Gregory Nutt wrote:
>
>>> But I want to play simple audio tones, from a sine look-up table,
>>> and filling a buffer and enqueuin
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