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/*! \file runfft.hcc
*
* \section generic This module will handle the audio I/O. It will ensure the
* audiosamples are correctly buffered and fed correctly to the FFT.\n
* This module will also handle the output of the modified audio samples.
*
* \section project Project information.
* Project Graphic Equalizer\n
* \author M. Lauwerijssen
* \date 20041110
* \version 0.1
*
* \section copyright Copyright
* Copyright ©2004 Koninklijke Philips Electronics N.V. All rights reserved
*
* \section history Change history
* 20041110: M. Lauwerijssen\n Initial version
*
********************************************************************/
#include <stdlib.hch>
#include "pal_master.hch"
#include "configuration.hch"
#if USE_RUNFFT
#include "fft.hch"
#include "debug.hch"
/*
* Forward declarations
*/
static macro expr ClockRate = PAL_ACTUAL_CLOCK_RATE;
extern mpram DualPortInputRam AudioIn;
extern mpram DualPortOutputRam AudioOut;
extern chan unsigned 1 AudioOutReady;
chan unsigned 1 AudioInReady;
#if HARDWARE_MULTIPLY
signed 18 *audioptr_in1,*audioptr_in2,*audioptr_in3,*audioptr_in4;
signed 18 *audioptr_out1,*audioptr_out2;
unsigned 6 *displayptr1,*displayptr2,*displayptr3,*displayptr4;
#else
signed 16 *audioptr_in1,*audioptr_in2,*audioptr_in3,*audioptr_in4;
signed 16 *audioptr_out1,*audioptr_out2;
#endif
/*! \fn macro proc audio_main(AUDIOIN, AUDIOOUT);
* \brief
*
* \param AUDIOIN Handle to audio-input
* \param AUDIOOUT Handle to audio-output
*
* \return Never Returns.
* \retval void
*/
macro proc audio_main(AUDIOIN, AUDIOOUT)
{
unsigned 6 sample_count;
unsigned 1 FFT_Sync;
macro expr OW = PalAudioOutGetMaxDataWidthCT ();
macro expr IW = PalAudioInGetMaxDataWidthCT ();
signed LeftNew, RightNew;
signed Output_sample;
//pointers for double and quadruple buffering:
audioptr_in1 = &AudioIn.audio_io[0];
audioptr_in2 = &AudioIn.audio_io[64];
audioptr_in3 = &AudioIn.audio_io[128];
audioptr_in4 = &AudioIn.audio_io[192];
audioptr_out1 = &AudioOut.audio_io[0];
audioptr_out2 = &AudioOut.audio_io[64];
FFT_Sync=0;
par
{
for(;;)//Notify FFT loop.
{
if (FFT_Sync) //if 64 samples are read from ADC...
{
par
{
// switch pointers
audioptr_in1 = audioptr_in2;
audioptr_in2 = audioptr_in3;
audioptr_in3 = audioptr_in4;
audioptr_in4 = audioptr_in1;
audioptr_out1 = audioptr_out2;
audioptr_out2 = audioptr_out1;
FFT_Sync = 0;
}
AudioInReady ! sync;
}
else
delay;
}
for(sample_count=0;;)//Audiosampling loop
{
if (!FFT_Sync)
{
par
{
seq
{
PalAudioInRead(AUDIOIN, &LeftNew, &RightNew);
#if HARDWARE_MULTIPLY
audioptr_in1[sample_count] = LeftNew;//drop 2 LSB's
#else
audioptr_in1[sample_count] = (LeftNew\\2);//drop 2 LSB's
#endif
sample_count++;
if (!sample_count)
{
FFT_Sync = 1;
}
}
seq
{
Output_sample = audioptr_out2[sample_count];
}
}
}
else
{
delay;
}
}
for(;;)//Audio output-loop
{
PalAudioOutWrite(AUDIOOUT,(signed OW)(Output_sample @ 0),(signed OW)(Output_sample @ 0));
}
}//end par
}// end function
#endif
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