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From: T-Online <k.fetscher@t-online.de>
To: alsa-devel@lists.sourceforge.net
Subject: Re: ALSA Driver for ARM
Date: Tue, 29 Mar 2005 23:31:08 +0200	[thread overview]
Message-ID: <4249C91C.9000000@t-online.de> (raw)
In-Reply-To: <42480A24.5070602@fetron.de>

Hi,

I have a new hint, but the problem is not solved.

> I want to programm an driver for the Cirrus CS42516 and the ARM9 CPU 
> EP93xx also from Cirrus.
>
> I think, there are several errors:
>
> - when I start aplay, I receive a buffer. A dump to this memory region 
> show only zeros.
>
I have written some characters into the DMA Memory Area (with a Hardware 
Debugger) when the driver is started, but aplay is not started. After I 
start aplay, all my characters are overwritten with Zero.

Which function in ALSA is responsible for filling the DMA Buffer ?

> - after the complete buffer is transmitted (but not the complete 
> file), I receive an underrun from ALSA
>
> - I never detect a mmap function call.
>
>  

Thanks,

Klaus


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  reply	other threads:[~2005-03-29 21:31 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-03-28 13:44 ALSA Driver for ARM K.Fetscher
2005-03-29 21:31 ` T-Online [this message]
2005-03-30 14:52   ` Takashi Iwai
2005-03-29 21:41 ` Nicolas Pitre
2005-03-30  5:51   ` K.Fetscher
2005-03-30 16:50     ` Nicolas Pitre

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