Hi, Good news for all stb0899 owners :) On Saturday 19 April 2008, Dominik Kuhlen wrote: > Hi, > > Here is my current version after quite a while of testing and tuning: > I stripped the stb0899 tuning/searching algo to speed up tuning a bit > now I have very fast and reliable locks (no failures, no errors) > The frequency reported by DVBFE_GET_PARAMS when in DVB-S2 mode is not correct. The attached patch fixes this: Now i can request any frequency near the center (even more than 10MHz lower or higher) and the reported frequency is within a few kHz of the actual center frequency. Dominik
diff -r 42a7b0fff69d linux/drivers/media/dvb/frontends/stb0899_algo.c
--- a/linux/drivers/media/dvb/frontends/stb0899_algo.c Sat Apr 19 11:27:44 2008 +0200
+++ b/linux/drivers/media/dvb/frontends/stb0899_algo.c Sat Apr 19 11:30:47 2008 +0200
@@ -1539,14 +1539,16 @@ enum stb0899_status stb0899_dvbs2_algo(s
/* Store signal parameters */
offsetfreq = STB0899_READ_S2REG(STB0899_S2DEMOD, CRL_FREQ);
+ if (offsetfreq & 0x20000000) {
+ /* sign extension */
+ offsetfreq |= 0xc0000000;
+ }
+ /* use 64-bit arithmetic to avoid overflow */
+ offsetfreq = (s32)((s64)offsetfreq *
+ ((s64)internal->master_clk / (s64)1000000) /
+ ((s64)((1 << 30) / (s64)1000)));
- offsetfreq = offsetfreq / ((1 << 30) / 1000);
- offsetfreq *= (internal->master_clk / 1000000);
- reg = STB0899_READ_S2REG(STB0899_S2DEMOD, DMD_CNTRL2);
- if (STB0899_GETFIELD(SPECTRUM_INVERT, reg))
- offsetfreq *= -1;
-
- internal->freq = internal->freq - offsetfreq;
+ internal->freq = internal->freq + offsetfreq;
internal->srate = stb0899_dvbs2_get_srate(state);
reg = STB0899_READ_S2REG(STB0899_S2DEMOD, UWP_STAT2);
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