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