Thomas Börkel wrote:
HI!
thomas schorpp wrote:
Whatever I do (different cables, changing amplification, switching
channels), czap always reports a ber of 195000.
status SCVYL | signal 8b8b | snr f3f3 | ber 0000001e | unc ffffffff |
FE_HAS_LOCK
status SCVYL | signal 8b8b | snr f2f2 | ber 0000001e | unc 00000000 |
FE_HAS_LOCK
its static here too on every channel.
In the meantime, using Google, I found one other owner, that also has
exactly 195000. This seems pretty unlikely to me, if the ber value is
computed right.
At the moment, one card has constantly 195000 and the other 101d0. I
guess, when I reboot, it's back to 195000 (like it was once, when one
card had a ber of 10.
BTW, czap and femon show different values, if I use femon without a
tuning app (like czap) running parallel, is this normal?
$ czap "das vierte" -c channels.conf
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
151 DAS
VIERTE:762000000:INVERSION_AUTO:6900000:FEC_NONE:QAM_64:2047:2048:1793
151 DAS VIERTE: f 762000000, s 6900000, i 2, fec 0, qam 3, v 0x7ff, a 0x800
status 1f | signal 8484 | snr f4f4 | ber 00195000 | unc ffffffff |
FE_HAS_LOCK
status 1f | signal 8484 | snr f3f3 | ber 00195000 | unc 00000000 |
FE_HAS_LOCK
*CTRL-C*
$ femon
using '/dev/dvb/adapter0/frontend0'
FE: Philips TDA10021 DVB-C (CABLE)
status 1f | signal 0000 | snr ffff | ber 00969696 | unc 0000000f |
FE_HAS_LOCK
status 1f | signal 0000 | snr ffff | ber 00969696 | unc 0000000f |
FE_HAS_LOCK
ber from device and driver is ok, use dvbsnoop -s signal.
bug is from misadaption/accesssyncprobs in femon+czap:
tom1:/usr/src/linux# dvbsnoop
dvbsnoop - a dvb/mpeg2 stream analyzer tool
Version: 1.4.00/api-3 (Sep 25 2005 20:42:27)
http://dvbsnoop.sourceforge.net/
(c) 2001-2005 Rainer Scherg (rasc)
Aug 26 08:59:54 tom1 kernel: tda10021: Verbose Status:
Aug 26 08:59:54 tom1 kernel: tda10021: VAFC -1
Aug 26 08:59:54 tom1 kernel: tda10021: VAGC 0x7f
Aug 26 08:59:54 tom1 kernel: tda10021: AGCCONF 0x23
Aug 26 08:59:54 tom1 kernel: tda10021: AGCREF 0x5c
Aug 26 08:59:54 tom1 kernel: tda10021: PWMREF 0x48
Aug 26 08:59:54 tom1 kernel: tda10021: MSE 0x0c
Aug 26 08:59:54 tom1 kernel: tda10021: BER-RANGE 0 <---- (inverted output 0...3 from sync register ber bits )
Aug 26 08:59:54 tom1 kernel: tda10021: SATNYQ 0x00
Aug 26 08:59:54 tom1 kernel: tda10021: SATADC 0x00
Aug 26 08:59:54 tom1 kernel: tda10021: HALFADC 0xb2
Aug 26 08:59:54 tom1 kernel: tda10021: SATDEC1 0x00
Aug 26 08:59:54 tom1 kernel: tda10021: SATDEC2 0x00
Aug 26 08:59:54 tom1 kernel: tda10021: SATDEC3 0x00
Aug 26 08:59:54 tom1 kernel: tda10021: CLKOFFSET 0x1c
Aug 26 08:59:54 tom1 kernel: tda10021: SATAAF 0x00
Aug 26 08:59:54 tom1 kernel: tda10021: EQCONF1 0x77
Aug 26 08:59:54 tom1 kernel: tda10021: EQSTEP 0x1a
Aug 26 08:59:54 tom1 kernel: tda10021: PLL 0x00
cycle: 95 d_time: 0.036 s Sig: 32639 SNR: 62708 BER: 1620 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 96 d_time: 0.036 s Sig: 32639 SNR: 62708 BER: 1620 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
(256qam channel)
cycle: 265 d_time: 0.035 s Sig: 35723 SNR: 62451 BER: 20 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 266 d_time: 0.036 s Sig: 35723 SNR: 62451 BER: 20 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
(64qam)
1. czap (ctrl-z)
2. dvbsnoop
3. femon
4. fg
you may want to reportbug femon and czap, i see no driver issue in tda10021.c
what not seems to be reliable is Sig, cause 256qam channels come with +6db from our network
so VAGC must be inverse proportional to signalstrengh, not proportional, philips tuners respond to
rising VAGC (tuner loop) with rising gain, too.
so a reliable signal reading should be calculated from the tuner AGC loop, which is in detail unknown
to me.
you cant just use *strength = (gain << 8) | gain;
cause AGC gain is usually -40dB...0dB/0...3.3(5)VAGC on philips tuners.
logarithmic dB calculation with VAGC,AGCREF or like should be done,
but not easy in a driver and without circuit knowlegde and in a universal driver and
tvapps dont need it.
but you should honor the proportionality with
static int tda10021_read_signal_strength(struct dvb_frontend* fe, u16* strength)
{
struct tda10021_state* state = fe->demodulator_priv;
u8 igain = ~tda10021_readreg(state, 0x17);
*strength = (igain << 8) | igain;
return 0;
}
at least.
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