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From: "Opensource [Adam Thomson]" <Adam.Thomson.Opensource@diasemi.com>
To: Mark Brown <broonie@kernel.org>,
	"Opensource [Adam Thomson]" <Adam.Thomson.Opensource@diasemi.com>
Cc: Liam Girdwood <lgirdwood@gmail.com>,
	Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
	Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	Kumar Gala <galak@codeaurora.org>,
	"alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Support Opensource" <Support.Opensource@diasemi.com>
Subject: RE: [PATCH 2/2] ASoC: codecs: Add da7218 codec driver
Date: Fri, 6 Nov 2015 13:17:28 +0000	[thread overview]
Message-ID: <2E89032DDAA8B9408CB92943514A0337D460CAAD@SW-EX-MBX01.diasemi.com> (raw)
In-Reply-To: <20151106115451.GG18409@sirena.org.uk>

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On November 6, 2015 11:55, Mark Brown wrote:

> > > > I can envisage in a system you may want to choose which capture channels can
> > > > trigger level detection (if any), and this may change depending on the use-case
> > > > at the time, so having it as a control makes sense to me.
> 
> > > What is a "capture channel" here?
> 
> > Input filters 1L/R and 2L/R, which are fed from either Mic1(ADC1) or DMic1L/R
> > and Mic2(ADC2) or DMic2L/R.
> 
> Hang on, is this just recording a DC value with the ADC and then looking
> at that?

The RMS of the Mic signal is taken and compared to the trigger level set. If
it's above that level then an IRQ is raised.
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WARNING: multiple messages have this Message-ID (diff)
From: "Opensource [Adam Thomson]" <Adam.Thomson.Opensource-WBD+wuPFNBhBDgjK7y7TUQ@public.gmane.org>
To: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	"Opensource [Adam Thomson]"
	<Adam.Thomson.Opensource-WBD+wuPFNBhBDgjK7y7TUQ@public.gmane.org>
Cc: Liam Girdwood <lgirdwood-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Jaroslav Kysela <perex-/Fr2/VpizcU@public.gmane.org>,
	Takashi Iwai <tiwai-IBi9RG/b67k@public.gmane.org>,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
	Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	Ian Campbell
	<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
	Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	"alsa-devel-K7yf7f+aM1XWsZ/bQMPhNw@public.gmane.org"
	<alsa-devel-K7yf7f+aM1XWsZ/bQMPhNw@public.gmane.org>,
	"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Support Opensource
	<Support.Opensource-WBD+wuPFNBhBDgjK7y7TUQ@public.gmane.org>
Subject: RE: [PATCH 2/2] ASoC: codecs: Add da7218 codec driver
Date: Fri, 6 Nov 2015 13:17:28 +0000	[thread overview]
Message-ID: <2E89032DDAA8B9408CB92943514A0337D460CAAD@SW-EX-MBX01.diasemi.com> (raw)
In-Reply-To: <20151106115451.GG18409-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>

On November 6, 2015 11:55, Mark Brown wrote:

> > > > I can envisage in a system you may want to choose which capture channels can
> > > > trigger level detection (if any), and this may change depending on the use-case
> > > > at the time, so having it as a control makes sense to me.
> 
> > > What is a "capture channel" here?
> 
> > Input filters 1L/R and 2L/R, which are fed from either Mic1(ADC1) or DMic1L/R
> > and Mic2(ADC2) or DMic2L/R.
> 
> Hang on, is this just recording a DC value with the ADC and then looking
> at that?

The RMS of the Mic signal is taken and compared to the trigger level set. If
it's above that level then an IRQ is raised.

  reply	other threads:[~2015-11-06 13:17 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-05 10:43 [PATCH 0/2] ASoC: Add support for DA7217 and DA7218 audio codecs Adam Thomson
2015-11-05 10:43 ` Adam Thomson
2015-11-05 10:43 ` [PATCH 1/2] ASoC: da7218: Add bindings documentation for DA7218 audio codec Adam Thomson
2015-11-05 10:43   ` Adam Thomson
2015-11-05 14:58   ` Mark Brown
2015-11-05 17:59     ` Opensource [Adam Thomson]
2015-11-05 17:59       ` Opensource [Adam Thomson]
2015-11-06 10:30       ` Mark Brown
2015-11-05 10:43 ` [PATCH 2/2] ASoC: codecs: Add da7218 codec driver Adam Thomson
2015-11-05 10:43   ` Adam Thomson
2015-11-05 15:27   ` Mark Brown
2015-11-06 11:11     ` Opensource [Adam Thomson]
2015-11-06 11:11       ` Opensource [Adam Thomson]
2015-11-06 11:21       ` Mark Brown
2015-11-06 11:21         ` Mark Brown
2015-11-06 11:53         ` Opensource [Adam Thomson]
2015-11-06 11:53           ` Opensource [Adam Thomson]
2015-11-06 11:54           ` Mark Brown
2015-11-06 11:54             ` Mark Brown
2015-11-06 13:17             ` Opensource [Adam Thomson] [this message]
2015-11-06 13:17               ` Opensource [Adam Thomson]
2015-11-08 10:34               ` Mark Brown
2015-11-08 10:34                 ` Mark Brown
2015-11-09 12:28                 ` Opensource [Adam Thomson]
2015-11-09 12:28                   ` Opensource [Adam Thomson]
2015-11-09 14:02                   ` Mark Brown
2015-11-09 14:02                     ` Mark Brown
2015-11-10 13:55                     ` Opensource [Adam Thomson]
2015-11-10 13:55                       ` Opensource [Adam Thomson]
2015-11-10 14:15                       ` Mark Brown
2015-11-10 14:24                         ` Opensource [Adam Thomson]
2015-11-10 14:24                           ` Opensource [Adam Thomson]
2015-11-10 15:44                           ` Mark Brown
2015-11-10 16:21                             ` Opensource [Adam Thomson]
2015-11-10 16:21                               ` Opensource [Adam Thomson]
2015-11-10 16:42                               ` Mark Brown
2015-11-10 16:42                                 ` Mark Brown

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