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From: Steve Simon <steve@quintile.net>
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Date: Sat, 12 Feb 2022 18:46:47 +0000
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Subject: Re: [9front] pi4 wifi and audio
Reply-To: 9front@9front.org
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i assume you mean adding a DAC to I2S, I2C doesn=E2=80=99t have the bandwidt=
h for quality audio even at 400khz.

using and external dac over I2S can make a very significant (very measurable=
) difference to the quality of the audio you can extract from a rpi.

the most important part of this is locking the pi=E2=80=99s i2s stream to ex=
ternal crystals, and having quiet power supplies for the dac and any downstr=
eam gain stages.

i am afraid $1 chinese usb dacs are a poor second choice.

-Steve


> On 12 Feb 2022, at 6:16 pm, hiro <23hiro@gmail.com> wrote:
>=20
> =EF=BB=BFyes, miller's version has wifi. i don't remember if anybody did t=
he
> work to bring it to 9front, but in any case they didn't finish it ( =3D=3D=

> mainline it).
>=20
> audio, some people wasted their time with the incomplete audio
> solution in the rpi, it but then gave up IIRC.
> some people like to add a DAC to the I2C bus, but i consider that also
> a waste of time, esp. as long as you can get 1$ USB->audio converters
> including shipping from china, the quality is 100% matching the rpi
> hardware, and a lot better than most DIY rpi audio add-ons.
>=20
> as much as i hate USB, for soundcards that's good enough and we
> already support it.
>=20
>> On 2/12/22, thinktankworkspaces@gmail.com <thinktankworkspaces@gmail.com>=
 wrote:
>> So 9front on pi4 seems pretty stable. But has anyone got audio and wifi
>> working. I recall
>> reading some place that pi hardware developers kind of deviated from
>> convention so its a bit
>> tricky to get some of that stuff working. Perhaps I might also be asking f=
or
>> some sort of
>> guide to read on how to build or deal with making drivers in 9front and s=
ome
>> troubleshooting
>> steps to follow. Ponies and Unicorns I want those also, so yea.
>>=20