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/****************************************************************
* *
* Copyright (C) 1991-2003 Celoxica Ltd. All rights reserved. *
* *
*****************************************************************
* *
* Project : PAL *
* Date : 31 JAN 2003 *
* File : reverb.hcc *
* Author : Matthew Aubury (MA) *
* Contributors: *
* *
* Description: *
* Simple audio reverb. *
* *
* Date Version Author Reason for change *
* *
* 29 OCT 2002 1.00 MA Created *
* *
****************************************************************/
#define PAL_TARGET_CLOCK_RATE 25175000
#include <stdlib.hch>
#include "pal_master.hch"
#include "debug.hch"
#include "fft.hch"
#include "presets.hch"
#include "config.hch"
/*
* Forward declarations
*/
static macro proc RunFFT (AudioIn, AudioOut);
static macro expr ClockRate = PAL_ACTUAL_CLOCK_RATE;
//input buffer
ram signed 16 audio_buffer_in[256] with { block = "BlockRAM"};
//output buffer
ram signed 16 audio_buffer_out[128] with { block = "BlockRAM"};
//EQ settings for the FFT
ram unsigned 4 EQ_info[128] with { block = "BlockRAM"};
//EQ settings received from the display
mpram
{
ram unsigned 4 write[768];
rom unsigned 4 read[768];
}EQ_level with { block = "BlockRAM"};
mpram
{
ram unsigned 7 write[256];
rom unsigned 7 read[256];
}fft_info with { block = "BlockRAM"};
signed 16 *audioptr_in1,*audioptr_in2,*audioptr_in3,*audioptr_in4;
signed 16 *audioptr_out1,*audioptr_out2;
signed 16 *audioptr_temp;
unsigned 3 active_preset;
shared expr preset_address = (0@(active_preset-1))<<7;
/*
* Main program
*/
void main(void)
{
macro expr AudioIn = PalAudioInCT (0);
macro expr AudioOut = PalAudioOutCT (0);
/*
* Check we've got everything we need
*/
PalVersionRequire (1, 2);
PalAudioInRequire (1);
PalAudioOutRequire (1);
PalDataPortRequire (1);
/*
* Run
*/
par
{
PalAudioInRun (AudioIn, ClockRate);
PalAudioOutRun (AudioOut, ClockRate);
PalDataPortRun (PalRS232PortCT(0), PAL_ACTUAL_CLOCK_RATE );
seq
{
par
{
PalAudioInEnable (AudioIn);
PalAudioOutEnable (AudioOut);
PalDataPortEnable (PalRS232PortCT(0));
}
RC200AudioInSetInput(RC200AudioInLineIn);
RC200AudioInSetGain(0,6,6);
PalAudioInSetSampleRate (AudioIn, 44100);
PalAudioOutSetSampleRate (AudioOut, 44100);
RunFFT(AudioIn, AudioOut);
}
}
}
void LoadPresets()
{
unsigned 16 temp;
unsigned 10 count;
unsigned 8 index;
count=0;
do
{
par
{
temp = presets[index];
index++;
}
par { EQ_level.write[count] = temp[7:4]; count++; }
par { EQ_level.write[count] = temp[3:0]; count++; }
par { EQ_level.write[count] = temp[15:12]; count++; }
par { EQ_level.write[count] = temp[11:8]; count++; }
} while (count<768);
}
/*
* FFT routine
*/
static macro proc RunFFT (AudioIn, AudioOut)
{
signed 16 sample;
unsigned 6 sample_count;
unsigned 8 i;
unsigned 4 eqinfo;
unsigned 1 FFT_Sync;
macro expr OW = PalAudioOutGetMaxDataWidthCT ();
macro expr IW = PalAudioInGetMaxDataWidthCT ();
signed LeftNew, RightNew;
signed Output_sample;
active_preset = 3;
//pointers for double and quadruple buffering:
audioptr_in1=&audio_buffer_in[0];
audioptr_in2=&audio_buffer_in[64];
audioptr_in3=&audio_buffer_in[128];
audioptr_in4=&audio_buffer_in[192];
audioptr_out1=&audio_buffer_out[0];
audioptr_out2=&audio_buffer_out[64];
FFT_Sync=0;
LoadPresets();
par
{
for(;;)
{
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;
}
// FFT calculation
perform_fft(audioptr_in1);
/* for(i=0;i<NUMBER_OF_FREQUENCIES;i++)
{
eqinfo = EQ_level.read[preset_address+(0@i)];
EQ_info[i<-7]= eqinfo;
}
*/
// set volume of each individual frequency bar (equalizer)
// equalize_audio(&EQ_level.read[preset_address], &fft_info.write[0]);
// inverse FFT calculation
perform_ifft(audioptr_out1);
/*
for (i = 0; i != 64; i++)
{
sample = audioptr_in1[i];
audioptr_out1[i] = sample;
}
*/
}
else
delay;
}
for(sample_count=0;;)//store the samples in the inputbuffer
{
if (!FFT_Sync)
{
par
{
seq
{
PalAudioInRead (AudioIn, &LeftNew, &RightNew);
audioptr_in1[sample_count]=(LeftNew\\2);//drop 2 LSB's
sample_count++;
if (!sample_count)
{
FFT_Sync = 1;
}
else
delay;
}
seq
{
Output_sample = audioptr_out2[sample_count];
}
}
}
else
{
delay;
}
}
for(;;)
{
PalAudioOutWrite(AudioOut,(signed OW)(Output_sample @ 0),(signed OW)(Output_sample @ 0));
}
}//end par
}// end function
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