From: Clemens Ladisch <clemens@ladisch.de>
To: Carlo Caione <carlo@caione.org>, alsa-devel@alsa-project.org
Subject: Re: DMA buffer alignment
Date: Thu, 04 Dec 2014 17:20:51 +0100 [thread overview]
Message-ID: <548089E3.4060105@ladisch.de> (raw)
In-Reply-To: <CAOQ7t2b5Rr6OjpQQ8uvwQ+7O2RL=tTKyjWG1HSJuOc3X4-NDag@mail.gmail.com>
Carlo Caione wrote:
> Several user-space programs (like aplay) work well with my hw, since
> the buffer sent from the user-space is always (padded) of period-size
> bytes, that is aligned to my 64 bytes boundary. Others (like
> speaker-test) are not working because sometimes they snd_pcm_writei()
> a buffer that is not multiple of 64 bytes.
When a program writes two chunks of 32 bytes each, the final contents of
the memory are the same. So what exactly is the problem?
Regards,
Clemens
next prev parent reply other threads:[~2014-12-04 16:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-04 15:54 DMA buffer alignment Carlo Caione
2014-12-04 16:20 ` Clemens Ladisch [this message]
2014-12-05 1:04 ` Carlo Caione
2014-12-05 11:34 ` Clemens Ladisch
2014-12-05 2:23 ` Raymond Yau
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