Correct the signal strength calculation.
The current signal strength calculation does not consider the
baseband power and the compensation gain. Since the dvb callback
only takes unsigned int, the return value is always positive. The
application needs to negate the value if needed.
Test:
Set the signal generator to -30dbm, plus the cable loss and connector loss.
The result is 32dbm.
SPACECAST2# dvbsnoop -s signal -pd 9
dvbsnoop V1.4.50 -- http://dvbsnoop.sourceforge.net/
DEMUX : /dev/dvb/adapter0/demux0
DVR : /dev/dvb/adapter0/dvr0
FRONTEND: /dev/dvb/adapter0/frontend0
---------------------------------------------------------
Transponder/Frequency signal strength statistics...
Capabilities: BER: 1 SNR: 1 SIG: 1 STAT: 1 UBLK: 1
---------------------------------------------------------
cycle: 1 d_time: 0.001 s Sig: 32 SNR: 14 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 2 d_time: 0.013 s Sig: 32 SNR: 14 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 3 d_time: 0.012 s Sig: 32 SNR: 14 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 4 d_time: 0.012 s Sig: 32 SNR: 14 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 5 d_time: 0.012 s Sig: 32 SNR: 14 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 6 d_time: 0.013 s Sig: 32 SNR: 14 BER: 0 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
Google-Bug-Id: 19432272
Change-Id: I7d5c83c1a89a1b16d57e411374d5c13bd55c0f98
1 file changed
