基于QN8035 RDS接收电路

#include "config.h" #include "QN8035_DRV\QN8035_DRV.h" u8 QN8035_ReadReg(u8 adr); u8 QN8035_WriteReg(u8 adr, u8 value); #define R_TXRX_MASK 0x30 u8 QN8035_RSSIns = 255; u8 QN8035_Crystal = QN8035_CRYSTAL_DEFAULT; u8 QN8035_RSSIn[QN8035_BAND_NUM]; u8 QN8035_PrevMode; u8 QN8035_Country = COUNTRY_CHINA ; u16 QN8035_CH_START = 7600; u16 QN8035_CH_STOP = 10800; u8 QN8035_CH_STEP = 1; u8 QN8035_ClearScanFlag = 0; u16 QN8035_ClearChannel = 0; u8 QN8035_FirstScan = 1; u8 QN8035_AutoScanAll; u8 QN8035_IsStereo; u8 QN8035_ChCount; u16 QN8035_RSSInBB[QN8035_BAND_NUM+1]; u16 QN8035_ChList[QN_CCA_MAX_CH]; u8 QN8035_StepTbl[3]={5,10,20}; QN8035_SeekCallBack QN8035_CallBackFunc = 0; /********************************************************************** void QNF_RXInit() ********************************************************************** Description: set to SNR based MPX control. Call this function before tune to one specific channel Parameters: None Return Value: None **********************************************************************/ void QNF_RXInit() { QNF_SetRegBit(0x1B,0x08,0x00); //Let NFILT adjust freely QNF_SetRegBit(0x2C,0x3F,0x09); //When SNR<ccth31, ccfilt3 will work QNF_SetRegBit(0x1D,0x40,0x00); //Let ccfilter3 adjust freely QNF_SetRegBit(0x41,0x0F,0x0A); //Set a hcc index to trig ccfilter3's adjust QN8035_WriteReg(0x45,0x20); //Set aud_thrd will affect ccfilter3's tap number QNF_SetRegBit(0x40,0x70,0x70); //snc/hcc/sm snr_rssi_sel; snc_start=40; hcc_start=22; sm_start=20 QNF_SetRegBit(0x19,0x80,0x80); //Use SNR for ccfilter selection criterion QNF_SetRegBit(0x3E,0x80,0x80); //it is decided by programming this register QNF_SetRegBit(0x41,0xE0,0xA0); //DC notching High pass filter bandwidth; remove low freqency dc signals QNF_SetRegBit(0x42,0x10,0x10); //disable the vtune monitor QNF_SetRegBit(0x34, 0x7F,SMSTART_VAL); //set SNCSTART // QNF_SetRegBit(0x35,0x7F,SNCSTART_VAL); //set SNCSTART // QNF_SetRegBit(0x36,0x7F,HCCSTART_VAL); //set HCCSTART QNF_SetRegBit(0x35,0x7F,60); //Change SNCSTART=60,the past SNCSTART=40 QNF_SetRegBit(0x36,0x7F,36); //Change HCCSTART=36,the past HCCSTART=22 } /********************************************************************** void QNF_SetMute(u8 On) ********************************************************************** Description: set register specified bit Parameters: On: 1: mute, 0: unmute Return Value: None **********************************************************************/ void QNF_SetMute(u8 On) { if(On) { QNF_SetRegBit(0x4C, 0x0B, 0x0B); } else { QN8035_Delay(QN8035_DELAY_BEFORE_UNMUTE); QNF_SetRegBit(0x4C, 0x0B, 0x00); } } /********************************************************************** void QNF_SetRegBit(u8 reg, u8 bitMask, u8 data_val) ********************************************************************** Description: set register specified bit Parameters: reg: register that will be set bitMask: mask specified bit of register data_val: data will be set for specified bit Return Value: None **********************************************************************/ void QNF_SetRegBit(u8 reg, u8 bitMask, u8 data_val) { u8 temp; temp = QN8035_ReadReg(reg); temp &= (u8)(~bitMask); temp |= data_val & bitMask; // temp |= data_val; QN8035_WriteReg(reg, temp); } /********************************************************************** void QNF_InitRSSInBB() ********************************************************************** Description: init RSSI noise floor band Parameters: None Return Value: None **********************************************************************/ void QNF_InitRSSInBB() { u8 i,d2,d,step; u16 d1; // get frequency leap step step = QN8035_StepTbl[QN8035_CH_STEP]; // total frequency span d1 = QN8035_CH_STOP - QN8035_CH_START; // make sure d2 value <= 255, normally QN8035_BAND_NUM should < 10 d2 = step * QN8035_BAND_NUM; d = d1/d2; // first one should be CH_START QN8035_RSSInBB[0] = QN8035_CH_START; for(i=1; i<QN8035_BAND_NUM; i++) { QN8035_RSSInBB[i] = QN8035_RSSInBB[i-1] + d * step; } // last one set one more step higher for convenience QN8035_RSSInBB[i] = QN8035_CH_STOP+step; } /********************************************************************** u8 QNF_GetRSSInBandIndex(u16 chfreq) ********************************************************************** Description: get band index Parameters: chfreq: channel frequency (10Khz unit, eg: for 101.10Mhz, input 10110) Return Value: band index for input CH frequency **********************************************************************/ u8 QNF_GetRSSInBandIndex(u16 chfreq) { u8 i; for(i=0; i<QN8035_BAND_NUM; i++) { if(chfreq < QN8035_RSSInBB[i+1]) { return i; } } } /********************************************************************** u8 QNF_GetRSSIn(u16 chFreq) ********************************************************************** Description: get RSSI noise floor Parameters: chfreq: channel frequency (10Khz unit, eg: for 101.10Mhz, input 10110) Return Value: the RSSI noise floor **********************************************************************/ u8 QNF_GetRSSIn(u16 chFreq) { u8 idx; idx = QNF_GetRSSInBandIndex(chFreq); return QN8035_RSSIn[idx]; } /********************************************************************** u16 QNF_GetCh() ********************************************************************** Description: get current channel frequency Parameters: None Return Value: channel frequency **********************************************************************/ u16 QNF_GetCh() { u8 tCh; u8 tStep; u16 ch = 0; // set to reg: CH_STEP tStep = QN8035_ReadReg(CH_STEP); tStep &= CH_CH; ch = tStep ; tCh= QN8035_ReadReg(CH); ch = (ch<<8)+tCh; return CHREG2FREQ(ch); } /********************************************************************** u8 QNF_SetCh(u16 freq) ********************************************************************** Description: set channel frequency Parameters: freq: channel frequency to be set Return Value: 1: success **********************************************************************/ u8 QNF_SetCh(u16 freq) { // calculate ch parameter used for register setting u8 tStep; u8 tCh; u16 f; f = FREQ2CHREG(freq); // set to reg: CH tCh = (u8) f; QN8035_WriteReg(CH, tCh); // set to reg: CH_STEP tStep = QN8035_ReadReg(CH_STEP); tStep &= ~CH_CH; tStep |= ((u8) (f >> 8) & CH_CH); QN8035_WriteReg(CH_STEP, tStep); return 1; } /********************************************************************** void QNF_ConfigScan(u16 start,u16 stop, u8 step) ********************************************************************** Description: config start, stop, step register for FM/AM CCA or CCS Parameters: start Set the frequency (10kHz) where scan to be started, eg: 7600 for 76.00MHz. stop Set the frequency (10kHz) where scan to be stopped, eg: 10800 for 108.00MHz step 1: set leap step to (FM)100kHz / 10kHz(AM) 2: set leap step to (FM)200kHz / 1kHz(AM) 0: set leap step to (FM)50kHz / 9kHz(AM) Return Value: None **********************************************************************/ void QNF_ConfigScan(u16 start,u16 stop, u8 step) { // calculate ch para u8 tStep = 0; u8 tS; u16