From: adr <adr@SDF.ORG>
To: 9front@9front.org
Subject: Re: [9front] bcm-audio
Date: Fri, 3 Dec 2021 02:13:48 +0000 (UTC) [thread overview]
Message-ID: <7cb3db78-1ec6-3c71-c4cd-8f15c73b2de@SDF.ORG> (raw)
In-Reply-To: <172D21BD-0B2C-4D13-909B-84EE2AEDB1B2@quintile.net>
On Fri, 3 Dec 2021, Steve Simon wrote:
> the bcm audio driver only worked with one pi model (the pi1 i think).
For what I've seen the dma controller interface is almost the same
(same base addrs, offsets, etc) with some enhanced channels (DMA4).
I'm not sure which are those and which are lite although, just poke
the debug regs?
The pi4 has now two pwm controllers, the jack is connected to gpios
40 and 41 (if I'm correct) and the code has to be changed to use
pwm1 when the soc is BCM2711.
> the pi?s audio hardware is very basic, however the soc is capable
> of sending i2s to an external dac, whilst being clocked from the
> dac.
Yes, I think this is the best option for quality audio and I'm sure
I'll play with this in the future, but I'd like to be able to use
the onboard audio output also.
I'll share with the list if I make it work.
Regards,
adr.
next prev parent reply other threads:[~2021-12-03 2:21 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-02 20:18 adr
2021-12-02 23:02 ` hiro
2021-12-03 0:30 ` Steve Simon
2021-12-03 1:43 ` Thaddeus Woskowiak
2021-12-03 2:13 ` adr [this message]
2021-12-03 1:35 ` adr
2021-12-03 2:55 ` Thaddeus Woskowiak
2021-12-03 5:04 ` Eli Cohen
2021-12-03 5:09 ` Eli Cohen
2021-12-03 5:15 ` Kurt H Maier
2021-12-03 5:28 ` Eli Cohen
2021-12-03 5:32 ` Eli Cohen
2021-12-03 7:45 ` the lemons
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