S3C2410 IIS总线sample code 分析

rGPBDAT=rGPBDAT&~(L3D|L3M|L3C)|(L3C|L3M);//L3M=H(indatatransfermode)

for(j=0;j<4;j++);//tsu(L3)D>190ns

//GPB[4:2]=L3C3D3M

for(i=0;i<8;i++)

{

if(data&0x1)//ifdatasLSBisH

{

rGPBDAT&=~L3C;//L3C=L

rGPBDAT|=L3D;//L3D=H

for(j=0;j<4;j++);//tcy(L3)>500ns

rGPBDAT|=(L3C|L3D);//L3C=H,L3D=H

for(j=0;j<4;j++);//tcy(L3)>500ns

}

else//IfdatasLSBisL

{

rGPBDAT&=~L3C;//L3C=L

rGPBDAT&=~L3D;//L3D=L

for(j=0;j<4;j++);//tcy(L3)>500ns

rGPBDAT|=L3C;//L3C=H

rGPBDAT&=~L3D;//L3D=L

for(j=0;j<4;j++);//tcy(L3)>500ns

}

data>>=1;//Forchecknextbit

}

rGPBDAT=rGPBDAT&~(L3D|L3M|L3C)|(L3C|L3M);//L3M=H,L3C=H

}

//==========================================================

staticvoidInit1341(charmode)

{

U16FsIdx;

//PortInitialize

//----------------------------------------------------------

//PORTBGROUP

//Ports:GPB4GPB3GPB2

//Signal:L3CLOCKL3DATAL3MODE

//Setting:OUTPUTOUTPUTOUTPUT

//[9:8][7:6}[5:4]

//Binary:01,0101

//----------------------------------------------------------

rGPBDAT=rGPBDAT&~(L3M|L3C|L3D)|(L3M|L3C);//Startcondition:L3M=H,L3C=H

rGPBUP=rGPBUP&~(0x7<2)|(0x7<2);//ThepullupfunctionisdisabledGPB[4:2]11100

rGPBCON=rGPBCON&~(0x3f<4)|(0x15<4);//GPB[4:2]=Output(L3CLOCK):Output(L3DATA):Output(L3MODE)

//L3Interface

_WrL3Addr(0x14+2);//STATUS(000101xx+10)

_WrL3Data(0x60,0);//0,1,10,000,0:Status0,Reset,256fs,IIS-bus,noDC-filtering

_WrL3Addr(0x14+2);//STATUS(000101xx+10)

FsIdx=mode?RecStatus.FsIdxlayStatus.FsIdx;

if(CodecPara[FsIdx].ofs)

_WrL3Data(0x18,0);//0,0,01,000,0:Status0,Noreset,384fs,IIS-bus,noDC-filtering

else

_WrL3Data(0x28,0);//0,0,10,000,0:Status0,Noreset,256fs,IIS-bus,noDC-filtering

_WrL3Addr(0x14+2);//STATUS(000101xx+10)

_WrL3Data(0xc1,0);//1,0,0,0,0,0,01

//Status1,GainofDAC6dB,GainofADC0dB,ADCnon-inverting,DACnon-inverting

//,Singlespeedplayback,ADC-OffDAC-On

//Record

if(mode){

_WrL3Addr(0x14+2);//STATUS(000101xx+10)

//_WrL3Data(0xa2,0);//1,0,1,0,0,0,10

//Status1,GainofDAC0dB,GainofADC6dB,ADCnon-inverting,DACnon-inverting

//,Singlespeedplayback,ADC-OnDAC-Off

_WrL3Data(0xe3,0);//1,1,1,0,0,0,11

//Status1,GainofDAC6dB,GainofADC6dB,ADCnon-inverting,DACnon-inverting

//,Singlespeedplayback,ADC-OnDAC-On,DAC打开使录音时可从耳机听到声音

//_WrL3Addr(0x14+0);//DATA0(000101xx+00)

//_WrL3Data(0x3f,0);//00,111111:Volumecontrol(6bits)

//_WrL3Data(0x00,0);//00,000000:Volumecontrol(6bits)0dB

_WrL3Addr(0x14+0);//DATA0(000101xx+00)

_WrL3Data(0x7b,0);//01,1110,11:Data0,BassBoost18~24dB,Treble6dB

//_WrL3Addr(0x14+0);//DATA0(000101xx+00)

_WrL3Data(0xc4,0);//11000,100:Extendedaddr(3bits),100

//_WrL3Data(0x90,0);//100,100,00:DATA0,EnableAGC,00,inputamplifiergainchannel2(2bits)

_WrL3Data(0xf0,0);//111,100,00:DATA0,EnableAGC,00,inputamplifiergainchannel2(2bits)

//_WrL3Addr(0x14+0);//DATA0(000101xx+00)

_WrL3Data(0xc0,0);//11000,000:Extendedaddr(3bits),000

_WrL3Data(0xe4,0);//111,00000:MA=0dB

_WrL3Data(0xc1,0);//11000,001:Extendedaddr(3bits),001

_WrL3Data(0xe4,0);//111,00000:MB=0dB

//_WrL3Addr(0x14+0);//DATA0(000101xx+00)

_WrL3Data(0xc2,0);//11000,010:Extendedaddr(3bits),010

//_WrL3Data(0x59,0);//010,110,01:DATA0,MICAmplifierGain27dB,inputchannel1select(inputchannel2off)

_WrL3Data(0xf9,0);//111,110,11:DATA0,MICAmplifierGain27dB,input1XMA+input2XMB

}

}

//==========================================================

staticvoidPlayPause(U8mode)

{

if(mode)

rIISCON&=~1;//stopiis

else

rIISCON|=1;//startiis

}

#defineMAX_VOLUME61

staticvoidAdjVolume(U16volume)

{

rGPBDAT=rGPBDAT&~(L3M|L3C|L3D)|(L3M|L3C);//Startcondition:L3M=H,L3C=H

rGPBUP=rGPBUP&~(0x7<2)|(0x7<2);//ThepullupfunctionisdisabledGPB[4:2]11100

rGPBCON=rGPBCON&~(0x3f<4)|(0x15<4);//GPB[4:2]=Output(L3CLOCK):Output(L3DATA):Output(L3MODE)

volume=(volume*MAX_VOLUME)/0xffff;

_WrL3Addr(0x14+0);//DATA0(000101xx+00)

_WrL3Data(MAX_VOLUME-volume,0);

}

/*

staticvoidMuting(void)

{

if(mute)//Mute

{

_WrL3Addr(0x14+0);//DATA0(000101xx+00)

_WrL3Data(0xa4,0);//10,1,00,1,00:after,node-emp,mute,flat

mute=0;

}

else//Nomute

{

_WrL3Addr(0x14+0);//DATA0(000101xx+00)

_WrL3Data(0xa0,0);//10,1,00,0,00:after,node-emp,nomute,flat

mute=1;

}

}

*/