调频
设置TUNNER
ch_QAM0297E_SetParameter
设TunerStart==true
#if 0
demod_d0297E_ScanFrequency( gsi_FrequncyKHz, gsi_SymbolRateBds, gsi_QamSize, gsi_SpectrumInverMode);
demod_d0297E_ScanFrequency( iTransponderFreq, iSymbolRate, cQamSize, iSpectrumInversion);
CH_TUNER_DelayMSEL( TUNER_SETTLING_TIME );
/* 6 MHz/Sec SweepRate = 1000.0 * (UserSweepRate/Fs) */
#endif
放这儿效率高，但不稳定，有时搜不到频点