Envy24-VT1712 Interrupt by Input Lines

Envy24-VT1712 Interrupt by Input Lines

[Chien Lee]

Hi,

I have a question regarding to how to find out which input line
(PSDIN0-PSDIN3)
is interrupting Envy24-VT1712 PCI Audio Controller.

VT1712's Professional Multi-Track Control Register MT00 provides bit 1
for
Multi-track record interrupt status. It only shows that there is an
interrupt occurred
for recording. It does not indentify which input line is the source. If
I am recording
PSDIN1audio signal and there is signal present at PSDIN0, I would get
interrupted
and record a wrong signal from PSDIN0.

Is there any way that I can find out which input line is interrupting
the chip?

Thanks,
Chien.

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Re: Envy24-VT1712 Interrupt by Input Lines

[Paul Davis]

>I have a question regarding to how to find out which input line
>(PSDIN0-PSDIN3)
>is interrupting Envy24-VT1712 PCI Audio Controller.
>
>VT1712's Professional Multi-Track Control Register MT00 provides bit 1
>for
>Multi-track record interrupt status. It only shows that there is an
>interrupt occurred
>for recording. It does not indentify which input line is the source. If
>I am recording
>PSDIN1audio signal and there is signal present at PSDIN0, I would get
>interrupted
>and record a wrong signal from PSDIN0.
>
>Is there any way that I can find out which input line is interrupting
>the chip?

either there is something rather subtle about what you are asking, and
i have misunderstood your question, or you don't understand how an
audio interface like the envy24 works. 

if the latter: input lines are not the cause of interrupts. they are
the source of a signal. interrupts are generated when the audio
interface decides to do so, which is generally based on an interval of
time, measured either in audio frames or absolute time, since the last
interrupt. 

if the former: sorry for misunderstanding you.

--p



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Re: Envy24-VT1712 Interrupt by Input Lines

[Jaroslav Kysela]

On Wed, 23 Apr 2003, Chien Lee wrote:

> Hi,
> 
> I have a question regarding to how to find out which input line
> (PSDIN0-PSDIN3)
> is interrupting Envy24-VT1712 PCI Audio Controller.
> 
> VT1712's Professional Multi-Track Control Register MT00 provides bit 1
> for
> Multi-track record interrupt status. It only shows that there is an
> interrupt occurred
> for recording. It does not indentify which input line is the source. If
> I am recording
> PSDIN1audio signal and there is signal present at PSDIN0, I would get
> interrupted
> and record a wrong signal from PSDIN0.
> 
> Is there any way that I can find out which input line is interrupting
> the chip?

All input lines are captured at once in interleaved sample frames.
There is 12 capture channels. Hardware vendors usually connects 0-7 
channels as analog, 8-9 as S/PDIF and 10-11 is the digital stereo mixer 
which contains result of playback and captured channels controlled with
a matrix mixer.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs



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