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180 lines
5.6 KiB
180 lines
5.6 KiB
/***********************************************************************
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* Records a buffer of sound from either the Line-In or Mic-In ports
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* to the AC97 controller and plays it back through the Line-Out port
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* using the AC97.
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***********************************************************************/
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#include <xbasic_types.h>
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#include <xio.h>
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#include "xac97_l.h"
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void XAC97_WriteReg(Xuint32 baseaddr, Xuint32 reg_addr, Xuint32 value) {
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XAC97_mSetAC97RegisterData(baseaddr, value);
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XAC97_mSetAC97RegisterAccessCommand(baseaddr, reg_addr);
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while (!XAC97_isRegisterAccessFinished(baseaddr));
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}
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Xuint32 XAC97_ReadReg(Xuint32 baseaddr, Xuint32 reg_addr) {
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XAC97_mSetAC97RegisterAccessCommand(baseaddr, reg_addr | 0x80);
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while (!XAC97_isRegisterAccessFinished(baseaddr));
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return XAC97_mGetAC97RegisterData(baseaddr);
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}
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void XAC97_AwaitCodecReady(Xuint32 baseaddr) {
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while(!XAC97_isCodecReady(baseaddr));
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}
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void XAC97_Delay(Xuint32 value) {
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volatile int i = value;
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while(i-- > 0);
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}
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void XAC97_SoftReset(Xuint32 BaseAddress) {
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XAC97_WriteReg(BaseAddress, AC97_Reset, 0x0000);
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/** Set default output volumes **/
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XAC97_WriteReg(BaseAddress, AC97_MasterVol, AC97_VOL_MID);
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XAC97_WriteReg(BaseAddress, AC97_AuxOutVol, AC97_VOL_MAX);
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XAC97_WriteReg(BaseAddress, AC97_MasterVolMono, AC97_VOL_MAX);
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XAC97_WriteReg(BaseAddress, AC97_PCMOutVol, AC97_VOL_MAX);
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/** Clear the fifos **/
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XAC97_ClearFifos(BaseAddress);
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}
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void XAC97_HardReset(Xuint32 BaseAddress) {
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XAC97_mSetControl(BaseAddress, AC97_ENABLE_RESET_AC97);
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XAC97_Delay(100000);
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XAC97_mSetControl(BaseAddress, AC97_DISABLE_RESET_AC97);
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XAC97_Delay(100000);
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XAC97_SoftReset(BaseAddress);
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}
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void XAC97_InitAudio(Xuint32 BaseAddress, Xuint8 Loopback) {
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Xuint8 i;
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/** Reset audio codec **/
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XAC97_SoftReset(BaseAddress);
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/** Wait until we receive the ready signal **/
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XAC97_AwaitCodecReady(BaseAddress);
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if( Loopback == AC97_ANALOG_LOOPBACK ) {
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XAC97_WriteReg(BaseAddress, AC97_MicVol, AC97_VOL_MAX);
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XAC97_WriteReg(BaseAddress, AC97_LineInVol, AC97_VOL_MAX);
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}
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else if( Loopback == AC97_DIGITAL_LOOPBACK )
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XAC97_WriteReg(BaseAddress, AC97_GeneralPurpose, AC97_GP_ADC_DAC_LOOPBACK);
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} // end XAC97_InitAudio()
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void XAC97_EnableInput(Xuint32 BaseAddress, Xuint8 InputType) {
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XAC97_WriteReg(BaseAddress, AC97_RecordGain, AC97_VOL_MAX);
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if( InputType == AC97_MIC_INPUT )
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XAC97_WriteReg(BaseAddress, AC97_RecordSelect, AC97_RECORD_MIC_IN);
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else if( InputType == AC97_LINE_INPUT )
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XAC97_WriteReg(BaseAddress, AC97_RecordSelect, AC97_RECORD_LINE_IN);
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}
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void XAC97_DisableInput(Xuint32 BaseAddress, Xuint8 InputType) {
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XAC97_WriteReg(BaseAddress, AC97_RecordGain, AC97_VOL_MUTE);
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if( InputType == AC97_MIC_INPUT )
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XAC97_WriteReg(BaseAddress, AC97_MicVol, AC97_VOL_MUTE);
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else if( InputType == AC97_LINE_INPUT )
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XAC97_WriteReg(BaseAddress, AC97_LineInVol, AC97_VOL_MUTE);
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}
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void XAC97_RecAudio(Xuint32 BaseAddress, Xuint32 StartAddress,
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Xuint32 EndAddress) {
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Xuint32 i;
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Xuint32 sample;
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volatile Xuint32 *sound_ptr = (Xuint32*)StartAddress;
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/** Enable VRA Mode **/
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XAC97_WriteReg(BaseAddress, AC97_ExtendedAudioStat, 1);
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/** Clear out the FIFOs **/
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XAC97_ClearFifos(BaseAddress);
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/** Wait until we receive the ready signal **/
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XAC97_AwaitCodecReady(BaseAddress);
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/** Volume settings **/
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XAC97_WriteReg(BaseAddress, AC97_MasterVol, AC97_VOL_MUTE);
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XAC97_WriteReg(BaseAddress, AC97_AuxOutVol, AC97_VOL_MUTE);
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XAC97_WriteReg(BaseAddress, AC97_MasterVolMono, AC97_VOL_MUTE);
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XAC97_WriteReg(BaseAddress, AC97_PCBeepVol, AC97_VOL_MUTE);
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XAC97_WriteReg(BaseAddress, AC97_PCMOutVol, AC97_VOL_MUTE);
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XAC97_WriteReg(BaseAddress, AC97_GeneralPurpose, AC97_GP_PCM_BYPASS_3D);
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/** Record the incoming audio **/
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while( sound_ptr < (Xuint32*)EndAddress ) {
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sample = XAC97_ReadFifo(BaseAddress);
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*sound_ptr = sample;
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sound_ptr++;
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}
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} // end XAC97_RecAudio()
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void XAC97_PlayAudio(Xuint32 BaseAddress, Xuint32 StartAddress,
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Xuint32 EndAddress){
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Xuint32 i;
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Xuint32 sample;
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volatile Xuint32 *sound_ptr = (Xuint32*)StartAddress;
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/** Wait for the ready signal **/
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XAC97_AwaitCodecReady(BaseAddress);
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/** Disable VRA Mode **/
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XAC97_WriteReg(BaseAddress, AC97_ExtendedAudioStat, 0);
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/** Play Volume Settings **/
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XAC97_WriteReg(BaseAddress, AC97_MasterVol, AC97_VOL_MAX);
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XAC97_WriteReg(BaseAddress, AC97_AuxOutVol, AC97_VOL_MAX);
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XAC97_WriteReg(BaseAddress, AC97_MasterVolMono, AC97_VOL_MAX);
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XAC97_WriteReg(BaseAddress, AC97_PCBeepVol, AC97_VOL_MAX);
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XAC97_WriteReg(BaseAddress, AC97_PCMOutVol, AC97_VOL_MAX);
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XAC97_WriteReg(BaseAddress, AC97_LineInVol, AC97_VOL_MAX);
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XAC97_WriteReg(BaseAddress, AC97_MicVol, AC97_VOL_MAX);
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/** Clear FIFOs **/
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XAC97_ClearFifos(BaseAddress);
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while( sound_ptr < (Xuint32*)EndAddress ) {
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sample = *sound_ptr;
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sound_ptr = sound_ptr + 1;
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XAC97_WriteFifo(BaseAddress, sample);
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}
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XAC97_ClearFifos(BaseAddress);
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} // end XAC97_PlayAudio()
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Xuint32 XAC97_ReadFifo(Xuint32 BaseAddress) {
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while(XAC97_isOutFIFOEmpty(BaseAddress));
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return XAC97_mGetOutFifoData(BaseAddress);
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}
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void XAC97_WriteFifo(Xuint32 BaseAddress, Xuint32 sample) {
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while(XAC97_isInFIFOFull(BaseAddress));
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XAC97_mSetInFifoData(BaseAddress, sample);
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}
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void XAC97_ClearFifos(Xuint32 BaseAddress) {
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Xuint32 i;
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XAC97_mSetControl(BaseAddress, AC97_CLEAR_FIFOS);
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for( i = 0; i < 512; i++ )
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XAC97_mSetInFifoData(BaseAddress, 0);
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}
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