From: "Emmanuel Fusté" <emmanuel.fuste@laposte.net>
To: Matt Flax <flatmax@flatmax.org>
Cc: alsa-devel@alsa-project.org, ckeepax@opensource.wolfsonmicro.com
Subject: Re: [PATCH 0/3] ASoC: Enable a new IC master mode: bcm2835<=>IC<=>cs42xx8
Date: Sun, 26 Feb 2017 23:49:49 +0100 [thread overview]
Message-ID: <97c0ea59-edbd-ed59-eb4a-82019dae080c@laposte.net> (raw)
In-Reply-To: <bb7f470f-ab3c-4185-ac4b-431bc8b9c000@flatmax.org>
Le 26/02/2017 à 22:44, Matt Flax a écrit :
>
>
> On 27/02/17 07:41, Emmanuel Fusté wrote:
>>
>>
>> I'm a complete newbie to ASoC but I take part to this tread to learn
>> as I hate to see how badly all diy and amateur audio hw are
>> integrated with Alsa/ASoC/Linux and so never go upstream. On a
>> professional/commercial dev, you would never take this ... convoluted
>> I2S multi channel path.
>>
>
> Hey Emmanuel,
>
> We now know that we can retrofit legacy I2S silicon for multichannel,
> in a very direct manner.
>
> If you were a chip manufacturer and you could potentially increase
> your market take up by hundreds of millions of new potential low power
> devices, wouldn't you manufacture ALL new chips with these minor
> modifications ?
>
> Matt
Hi,
No, because this is a hack. There is established an more importantly
interoperable bus standards to do multichannel digital audio : TDM/DSP
A/DSP B
As today standards, even ultra low power and low powerfull IC are able
to do standard multichannel serial audio. Atmel AT & ARM cortex M µC,
STMicro STM32 family etc ...
I2S signaling is only part of the equation, fifo, DMA handling, etc...
of the multichannel part could be important depending of the implementation.
And the FPGA glue logic is way more costly than choosing a SOC / µC with
a properly designed multichannel serial audio IP.
The real question is why this SOC so poorly endowed with bad device IP
is so popular... but this is another story...
Don't get me wrong. I'm nevertheless a real supporter of this "hack".
But it should be done the "right" way.
Emmanuel.
next prev parent reply other threads:[~2017-02-26 22:49 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-25 5:03 [PATCH 0/3] ASoC: Enable a new IC master mode: bcm2835<=>IC<=>cs42xx8 Matt Flax
2017-02-25 5:03 ` Matt Flax
2017-02-25 5:03 ` [PATCH 1/3] ASoC : Add an IC bit and frame master mode (SoC and Codec slave) Matt Flax
2017-02-25 5:03 ` Matt Flax
2017-03-15 19:02 ` Mark Brown
2017-03-15 19:02 ` Mark Brown
2017-02-25 5:03 ` [PATCH 2/3] ASoC: cs42xx8: allow IC master mode Matt Flax
2017-02-25 5:03 ` Matt Flax
2017-02-25 5:03 ` [PATCH 3/3] ASoC: bcm2835: Add mutichannel mode in DSP and IC master modes Matt Flax
2017-02-25 5:03 ` Matt Flax
2017-02-25 13:39 ` [PATCH 0/3] ASoC: Enable a new IC master mode: bcm2835<=>IC<=>cs42xx8 Matthias Reichl
2017-02-25 13:39 ` Matthias Reichl
2017-02-25 22:13 ` Matt Flax
2017-02-25 22:13 ` [alsa-devel] " Matt Flax
2017-02-26 14:49 ` Matthias Reichl
2017-02-26 14:49 ` [alsa-devel] " Matthias Reichl
2017-02-26 20:21 ` Matt Flax
2017-02-26 20:21 ` [alsa-devel] " Matt Flax
2017-02-26 22:16 ` Matthias Reichl
2017-02-26 22:16 ` [alsa-devel] " Matthias Reichl
2017-02-26 22:35 ` Matt Flax
2017-02-26 22:35 ` [alsa-devel] " Matt Flax
2017-02-27 8:04 ` Matthias Reichl
2017-02-27 8:04 ` [alsa-devel] " Matthias Reichl
2017-02-27 10:08 ` Matt Flax
2017-02-27 10:08 ` [alsa-devel] " Matt Flax
2017-02-27 10:30 ` Matthias Reichl
2017-02-27 10:30 ` [alsa-devel] " Matthias Reichl
2017-02-27 11:21 ` Matt Flax
2017-02-27 11:21 ` [alsa-devel] " Matt Flax
2017-02-27 11:51 ` Matthias Reichl
2017-02-27 11:51 ` [alsa-devel] " Matthias Reichl
2017-02-28 9:59 ` Charles Keepax
2017-02-28 9:59 ` [alsa-devel] " Charles Keepax
2017-03-15 19:01 ` Mark Brown
2017-03-15 19:01 ` [alsa-devel] " Mark Brown
2017-03-16 20:51 ` Matt Flax
2017-03-16 20:51 ` [alsa-devel] " Matt Flax
2017-03-16 21:27 ` Lars-Peter Clausen
2017-03-16 21:27 ` [alsa-devel] " Lars-Peter Clausen
2017-03-16 22:14 ` Matt Flax
2017-03-16 22:14 ` [alsa-devel] " Matt Flax
2017-03-21 21:21 ` Emmanuel Fusté
2017-03-21 21:21 ` [alsa-devel] " Emmanuel Fusté
2017-03-21 22:11 ` Matthias Reichl
2017-03-21 22:11 ` [alsa-devel] " Matthias Reichl
2017-03-21 23:29 ` Matt Flax
2017-03-21 23:29 ` [alsa-devel] " Matt Flax
2017-03-22 9:43 ` Charles Keepax
2017-03-22 9:43 ` [alsa-devel] " Charles Keepax
2017-03-22 12:04 ` Matt Flax
2017-03-22 12:04 ` [alsa-devel] " Matt Flax
2017-03-22 12:34 ` Charles Keepax
2017-03-22 12:34 ` Charles Keepax
2017-03-22 15:38 ` Stephen Warren
2017-03-22 15:38 ` [alsa-devel] " Stephen Warren
2017-03-24 19:11 ` Mark Brown
2017-03-24 19:11 ` [alsa-devel] " Mark Brown
2017-03-24 19:09 ` Mark Brown
2017-03-24 19:09 ` [alsa-devel] " Mark Brown
2017-03-25 5:45 ` Matt Flax
2017-03-25 5:45 ` [alsa-devel] " Matt Flax
2017-03-27 10:01 ` Mark Brown
2017-03-27 10:01 ` [alsa-devel] " Mark Brown
2017-03-27 10:35 ` Matt Flax
2017-03-27 10:35 ` [alsa-devel] " Matt Flax
2017-03-27 11:30 ` Mark Brown
2017-03-27 11:30 ` [alsa-devel] " Mark Brown
2017-03-26 19:02 ` Emmanuel Fusté
2017-03-26 19:02 ` [alsa-devel] " Emmanuel Fusté
2017-02-28 10:10 ` Charles Keepax
2017-02-28 10:10 ` [alsa-devel] " Charles Keepax
2017-02-26 20:41 ` Emmanuel Fusté
2017-02-26 20:41 ` [alsa-devel] " Emmanuel Fusté
2017-02-26 21:44 ` Matt Flax
2017-02-26 22:49 ` Emmanuel Fusté [this message]
2017-02-27 9:14 ` Matthias Reichl
2017-02-27 9:14 ` [alsa-devel] " Matthias Reichl
2017-02-27 18:19 ` Emmanuel Fusté
2017-02-27 19:12 ` Emmanuel Fusté
2017-02-27 19:12 ` [alsa-devel] " Emmanuel Fusté
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