Re: [linux-dvb] Need Help with PCTV 452e (USB DVB-S2 device with STB0899)

From: Dominik Kuhlen <dkuhlen@gmx.net>
To: linux-dvb@linuxtv.org
Subject: Re: [linux-dvb] Need Help with PCTV 452e (USB DVB-S2 device with STB0899)
Date: Sun, 16 Mar 2008 16:03:24 +0100	[thread overview]
Message-ID: <200803161603.24956.dkuhlen@gmx.net> (raw)
In-Reply-To: <47C88CBF.7010304@gmail.com>

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Hi,

The attached pctv452e.c works for me without frame drops in DVB-S and DVB-S2.

On Friday 29 February 2008, Manu Abraham wrote:
> Dominik Kuhlen wrote:
> > On Friday 22 February 2008, Dominik Kuhlen wrote:
> >> Hi,
> >>
> >> -----snip----
> >>> Great, that was the trick, now scanning and szap work fine.
> >>>
> >>> Thanks for that hint!
> >> You're welcome.
> >>
> >> BTW: do you receive broken streams  (symbol rate 22000 or 27500)?
> >> Currently I get a loss of about 1 TS packet every second or even more (with both symbol rates).
> >> And there is exactly one TS packet missing (I diffed a TS hexdump).
> >> If it were the USB controller that drops packets it would be a loss of 5 consecutive TS packets. (940 bytes iso frame size)
> > 
> > I have to correct that statement (I didn't record the whole TS): 
> > The loss is exactly one USB frame (5 consecutive TS packets in this case)
> > which happens about every 1000 TS packets (200 USB frames)
The problem seems to be  wrong initial config parameter set in init_s1_demod table.
I copied this table from the mantis 1041 and it seems to be working now.
(I should probably check the USB logs and use these values.)
The first tuning after powerup/init fails quite often for me but the folllowings are fine
even switching from DVB-S to DVB-S2 works like a charm.

> Is it really isochronous transfer that the device really uses in it's
> default mode ? I guess many vendors prefer bulk transfers for the
> default transfer mode ?
There's a bulk pipe but it's only used for setup/control afaik.

Happy testing,
Dominik

BTW: why is the mantis development in a separate HG repo?
 I merged the mantis driver to the multiproto repo and can use the
 mantis-1041 and pctv452e simultanously :)

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