[asterisk-dev] Sync problem

[Muhammad Ali]

thanks :)

On Wed, Aug 4, 2010 at 5:10 PM, Kevin P. Fleming <kpfleming at digium.com>wrote:

> On 08/04/2010 02:17 AM, Muhammad Ali wrote:
>
> > The point where i think things are going wrong is, when am not
> > transmitting anything (not executing *write)* i get 0xFF on the receive
> > side, even when the channels are in "*clear*" state. Can this be
> > controller/ disabled ( i am assuming buffer policy set to "*when full*"
> > might help but want to make sure)?
>
> No. This is TDM, there is *always* data being transferred, and if the
> transmit buffer empties, default data will be sent instead. This is not
> a packet network, it's a continuous stream of data.
>
> > Secondly, when i try the *ioctl *for ZT_IOMUX for ZT_IOMUX_READ it
> > always returns as soon as its called which means it does not wait for my
> > write to happen (maybe this is because of 0xFF always on the line).
> >
> > So how can i sense if there is actual write on the wire and not 0xFF so
> > i may wait for actual data to start before depleting my buffers.
>
> You can't; you will have to use some sort of framing indication in the
> data stream itself for you receiver to be able to locate packets of data
> and extract them from the stream.
>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> skype: kpfleming | jabber: kfleming at digium.com
> Check us out at www.digium.com & www.asterisk.org
>
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-- 
ALi...
(علی)
http://m-ali.deviantart.com
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