main.c

visual dsp++ audio iir

//--------------------------------------------------------------------------//
//																			//
//	 Name: 	Talkthrough for the ADSP-BF561 EZ-KIT Lite						//
//																			//
//--------------------------------------------------------------------------//
//																			//
//	(C) Copyright 2003 - Analog Devices, Inc.  All rights reserved.			//
//																			//
//	Project Name:	BF561 C Talkthrough TDM									//
//																			//
//	Date Modified:	16/10/03		HD		Rev 0.2							//
//																			//
//	Software:		VisualDSP++3.5											//
//																			//
//	Hardware:		ADSP-BF561 EZ-KIT Board									//
//																			//
//	Connections:	Dipswitch SW4 : set #6 to "on"							//
//					Dipswitch SW4 : set #5 to "off"							//
//					Connect an input source (such as a radio) to the Audio	//
//					input jack and an output source (such as headphones) to //
//					the Audio output jack									//
//																			//
//	Purpose:		This program sets up the SPI port on the ADSP-BF561 to  //
//					configure the AD1836 codec.  The SPI port is disabled 	//
//					after initialization.  The data to/from the codec are 	//
//					transfered over SPORT0 in TDM mode						//
//																			//
//--------------------------------------------------------------------------//

#include "Talkthrough.h"
#include "sysreg.h"
#include "ccblkfn.h"
#include <btc.h>

#include <fract.h>
#include <filter.h>

//--------------------------------------------------------------------------//
// Variables																//
//																			//
// Description:	The variables iChannelxLeftIn and iChannelxRightIn contain 	//
//				the data coming from the codec AD1836.  The (processed)		//
//				playback data are written into the variables 				//
//				iChannelxLeftOut and iChannelxRightOut respectively, which 	//
//				are then sent back to the codec in the SPORT0 ISR.  		//
//				The values in the array iCodec1836TxRegs can be modified to //
//				set up the codec in different configurations according to   //
//				the AD1836 data sheet.										//
//--------------------------------------------------------------------------//

fract16 coefs[2*NUM_TAPS] = {
	#include "IIR_BP_coef2_1.dat" 
};

fract16 delay[2*(NUM_TAPS+NUM_TAPS)];
iir_state_fr16 state;	// declare filter state

//------------------------------
// left input data from ad1836
fract16 iChannel0LeftIn, iChannel1LeftIn;
// right input data from ad1836
fract16 iChannel0RightIn, iChannel1RightIn;
// left ouput data for ad1836	
fract16 iChannel0LeftOut, iChannel1LeftOut;
// right ouput data for ad1836
fract16 iChannel0RightOut, iChannel1RightOut;
// array for registers to configure the ad1836
// names are defined in "Talkthrough.h"
volatile short sCodec1836TxRegs[CODEC_1836_REGS_LENGTH] =
{									
					DAC_CONTROL_1	| 0x010,
					DAC_CONTROL_2	| 0x000,
					DAC_VOLUME_0	| 0x3ff,
					DAC_VOLUME_1	| 0x3ff,
					DAC_VOLUME_2	| 0x3ff,
					DAC_VOLUME_3	| 0x3ff,
					DAC_VOLUME_4	| 0x3ff,
					DAC_VOLUME_5	| 0x3ff,
					ADC_CONTROL_1	| 0x024,
					ADC_CONTROL_2	| 0x220,
					ADC_CONTROL_3	| 0x000
					
};

// SPORT0 DMA transmit buffer0
fract16 iTxBuffer0[2*VEC_SIZE];
// SPORT0 DMA receive buffer0
fract16 iRxBuffer0[2*VEC_SIZE];
// SPORT0 DMA transmit buffer1
fract16 iTxBuffer1[2*VEC_SIZE];
// SPORT0 DMA receive buffer1
fract16 iRxBuffer1[2*VEC_SIZE];

dma_register_t pDmaDescR0;
dma_register_t pDmaDescT0;
dma_register_t pDmaDescR1;
dma_register_t pDmaDescT1;
int dmaFlag = 0; 

////////////////////
// BTC Definitions
////////////////////
#define MAXBTCBUF  24000


long BTCLeft[MAXBTCBUF];
long BTCRight[MAXBTCBUF];	

int BTCLeftVolume = 0;
int BTCRightVolume = 0;

BTC_MAP_BEGIN	//Channel Name, Starting Address, Length (bytes)
	BTC_MAP_ENTRY("Audio Left Channel", (long)&BTCLeft, sizeof(BTCLeft))
	BTC_MAP_ENTRY("Audio Right Channel", (long)BTCRight, sizeof(BTCRight))
	BTC_MAP_ENTRY("Audio Left Volume", (long)&BTCLeftVolume, sizeof(BTCLeftVolume))
	BTC_MAP_ENTRY("Audio Right Volume", (long)&BTCRightVolume, sizeof(BTCRightVolume))
BTC_MAP_END



//--------------------------------------------------------------------------//
// Function:	main														//
//																			//
// Description:	After calling a few initalization routines, main() just 	//
//				waits in a loop forever.  The code to process the incoming  //
//				data can be placed in the function Process_Data() in the 	//
//				file "Process_Data.c".										//
//--------------------------------------------------------------------------//
void main(void)
{
	Init1836();
	Init_Sport0();
	Init_DMA();
	Init_Sport_Interrupts();
	Enable_DMA_Sport0();
		
	btc_init();
		
	int i ;
	fract16 tmp[NUM_TAPS*2];

	for(i = 0; i<NUM_TAPS*2;i++)
	{
		tmp[i] = coefs[i];
	}
	for (i = 0; i < NUM_TAPS;i++)
	{
		coefs[2*i] = tmp[i];
		coefs[2*i+1] = tmp[NUM_TAPS+i];
	}
	coefs[0] = 0;
		
	while(1)
	{
	    btc_poll();
	 }
}