From: Lee Revell <rlrevell@joe-job.com>
To: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Cc: linux-sh <linuxsh-dev@lists.sourceforge.net>,
alsa-devel@alsa-project.org
Subject: Re: kernel threads etc
Date: Mon, 06 Mar 2006 19:22:09 -0500 [thread overview]
Message-ID: <1141690930.25487.104.camel@mindpipe> (raw)
In-Reply-To: <1141690313.9230.32.camel@localhost.localdomain>
On Tue, 2006-03-07 at 00:11 +0000, Adrian McMenamin wrote:
> It transfers - without CPU intervention - memory from the SH4 (main
> CPU)
> memory to the ARM7 (sound processing chip) memory (ie the playback
> ring
> buffer). The function simply sets the register values and off it goes
>
>
OK - so it's the same DMA I am familiar with, it just needs to be
reprogrammed every period - IOW you can't tell it "repeatedly transfer
audio to this location until I tell you to stop".
If this is the case then I would say forget about the kernel thread and
the copy/silence callbacks - just do all the work in the interrupt
handler.
Lee
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next prev parent reply other threads:[~2006-03-07 0:22 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1141684061.9230.15.camel@localhost.localdomain>
2006-03-06 23:11 ` kernel threads etc Lee Revell
2006-03-06 23:29 ` Adrian McMenamin
2006-03-06 23:38 ` Adrian McMenamin
[not found] ` <1141687750.9230.24.camel@localhost.localdomain>
2006-03-06 23:48 ` Lee Revell
2006-03-07 0:11 ` Adrian McMenamin
[not found] ` <1141690313.9230.32.camel@localhost.localdomain>
2006-03-07 0:22 ` Lee Revell [this message]
2006-03-07 21:19 ` Adrian McMenamin
2006-03-07 21:29 ` Lee Revell
2006-03-07 21:32 ` Adrian McMenamin
[not found] ` <1141767139.9232.17.camel@localhost.localdomain>
2006-03-07 21:36 ` Lee Revell
2006-03-07 23:28 ` Adrian McMenamin
2006-03-07 0:26 ` Lee Revell
[not found] ` <1141688305.9230.26.camel@localhost.localdomain>
2006-03-06 23:49 ` Lee Revell
2006-03-06 22:27 Adrian McMenamin
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