[linux-dvb] Re: KWorld DVB-t

[Jonathan Thorpe <jlthorpe@gmail.com>]

I wonder if this info in the kernel logs could be a hint as to why the
DVB isn't working:

--
cx88_register_dvb_module
Linux video capture interface: v1.00
cx2388x v4l2 driver version 0.0.4 loaded
cx8800[0]: found at 0000:01:08.0, rev: 5, irq: 18, latency: 32, mmio: 0xde000000
cx8800[0]: subsystem: 17de:08a6, board: KWorld/VStream XPert DVB-t
[card=11,autodetected]
cx8800[0]: i2c register ok
cx8800[0]: registered device video0 [v4l2]
cx8800[0]: registered device vbi0

***cx8800_dvb: Unknown symbol cx88_register_dvb_module****
***cx8800[0]: couldn't register DVB module****

cx8800: Initialised TS code, frames_per_irq: 512, frames_to_buffer: 10240
cx88_register_dvb_module
Trying DVB attach on card c849d000
DVB: registering new adapter (cx8800[0]).
DVB attached to dev c849d000, dvb: cf67f400
DVB: registering frontend 0:0 (Samsung TDTC9251DH01C Tuner on V-Stream Card)...
--


> Since the KWorld/V-Stream card uses the same Samsung Tuner as the
> AVerMedia AVerTV DVB-T 771, I decided to force the mt352 front end to
> treat the V-Stream card as an Avermedia card with interesting results.
> 
> It seems that the tuner can now be controlled, but I can't grab the
> stream. After testing a variety of known frequencies (these are known
> to work in Windows) and A/V PIDs, dvbstream tunes in, but the
> resulting output is empty.
> 
> -----
> dvbstream -qam 64 -cr 3_4 -gi 16 -bw 7 -tm 8 -f 226500 -ps -n 10 -o
> 512 650 > /tmp/outstream.mpg
> dvbstream v0.6 - (C) Dave Chapman 2001-2004
> Released under the GPL.
> Latest version available from http://www.linuxstb.org/
> Using DVB card "Samsung TDTC9251DH01C Tuner on V-Stream Card"
> tuning DVB-T (Australia) to 226500000 Hz, Bandwidth: 7
> polling....
> Getting frontend event
> FE_STATUS:
> polling....
> Getting frontend event
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
> Event:  Frequency: 226505184
> Bit error rate: 0
> Signal strength: 65192
> SNR: 47802
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
> dvbstream will stop after 10 seconds (0 minutes)
> Setting filter for PID 512
> Setting filter for PID 650
> Output to stdout
> Streaming 2 streams
> Caught signal 1 - closing cleanly.
> -----
> 
> dvbtune provides similar results (in this case, it should show some
> information about the subchannels):
> 
> --
> ./dvbtune -f 219500 -i
> Using DVB card "Samsung TDTC9251DH01C Tuner on V-Stream Card"
> tuning DVB-T (Australia) to 219500000 Hz
> polling....
> Getting frontend event
> FE_STATUS:
> polling....
> Getting frontend event
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
> Bit error rate: 0
> Signal strength: 65186
> SNR: 52942
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
> <transponder type="T" freq="219500000">
> Nothing to read from fd_pat
> Nothing to read from fd_sdt
> </transponder>
> --
> 
> Could it be that the DVB extensions to the cx88xx driver need to be
> considered, or is this still a front end issue? I'm at a complete loss
> at this stage, but one thing that came to mind are the GPIOs used by
> card - it's likely that those used by the Fusion HDTV card aren't the
> same as those used by the KWorld card.
> 
> If this is the correct way to proceed, is there any way to get these
> values without a bus analyser? Am I way off track here?
> 
> Another problem I'm having (minor in comparison), is with recognising
> the V-Stream card - around line 260 in Christopher Pascoe's
> cx88-cards.c driver, I attempted to add:
> 
> --
> { "Samsung TDTC9251DH01C Tuner on V-Stream Card", { 0xDE, 0x17, 0xA6,
> 0x08}, NULL,
>           0x50, 0xFC, 0x0F, 0xC2,
>           { 0x31, 0x05 }, { 0x72, 0x49 }, { 0x64, 0x00 }, { 0x55, 0xB7 },
>           { { 11, 1, { 0x67, 0x10, 0x23, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00,
> 0x40, 0x40 } }, /* AGC */
>             { 2,  0, { 0xB5, 0x7A } },          /* ? Reserved register ? */
>             { 0 } },
>           83333, avermedia771_freq_to_tuner, default_tuner_to_freq, },
> --
> 
> Using this, the frontend defaults to the "Unkown" option - there must
> be something wrong with the IDs, but I'm not sure what.
> 
> I'd really appreciate help with getting this card working.
> 
> Thanks,
> Jonathan
>