main.c

this introduce infinite impulse response (IIR) filters. The filters are designed in MATLAB using th

//--------------------------------------------------------------------------//
//																			//
//	 Name: 	Talkthrough for the ADSP-BF533 EZ-KIT Lite						//
//																			//
//--------------------------------------------------------------------------//
//																			//
//	(C) Copyright 2006 - Analog Devices, Inc.  All rights reserved.			//
//																			//
//	Project Name:	BF533 C Talkthrough I2S									//
//																			//
//	Date Modified:	04/03/03		Rev 1.0							//
//																			//
//	Software:		VisualDSP++4.5											//
//																			//
//	Hardware:		ADSP-BF533 EZ-KIT Board									//
//																			//
//	Connections:	Connect RSCLK0 to TSCLK0 together (Turn SW9 pin 6 on)	//
//					Connect RFS0 to TFS0 together (Turn SW9 pin 5 ON)		//					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-BF533 to  //
//					configure the AD1836 codec.  The SPI port is disabled 	//
//					after initialization.  The data to/from the codec are 	//
//					transfered over SPORT0 in I2S mode						//
//																			//
//--------------------------------------------------------------------------//

#include "Talkthrough.h"
#include "sysreg.h"
#include "ccblkfn.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 AD1885 data sheet.										//
//--------------------------------------------------------------------------//
// left input data from ad1836
int iChannel0LeftIn, iChannel1LeftIn;
// right input data from ad1836
int iChannel0RightIn, iChannel1RightIn;
// left ouput data for ad1836	
int iChannel0LeftOut, iChannel1LeftOut;
// right ouput data for ad1836
int 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	| 0x000,
					DAC_CONTROL_2	| 0x000,
					DAC_VOLUME_0	| 0x3ff,
					DAC_VOLUME_1	| 0x3ff,
					DAC_VOLUME_2	| 0x3ff,
					DAC_VOLUME_3	| 0x3ff,
					DAC_VOLUME_4	| 0x000,
					DAC_VOLUME_5	| 0x000,
					ADC_CONTROL_1	| 0x000,
					ADC_CONTROL_2	| 0x000,
					ADC_CONTROL_3	| 0x000
					
};
// SPORT0 DMA transmit buffer
volatile int iTxBuffer1[4];
// SPORT0 DMA receive buffer
volatile int iRxBuffer1[4];

iir_state_fr16 LP_filt;
iir_state_fr16 HP_filt;

fract16 LP_delay[4] = {0, 0, 0, 0};
fract16 LP_coeffs[10];



fract16 HP_delay[4] = {0, 0, 0, 0};
fract16 HP_coeffs[10];

//--------------------------------------------------------------------------//
// 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)
{

    LP_coeffs[0] = float_to_fr16(0.6372369528 / 1.535104036);
	LP_coeffs[1] = float_to_fr16(-1.535104036 / -1.535104036);
	LP_coeffs[2] = float_to_fr16(1.0 / 2.0);
	LP_coeffs[3] = float_to_fr16(2.0 / 2.0);
	LP_coeffs[4] = float_to_fr16(1.0 / 2.0);

	LP_coeffs[5] = float_to_fr16(0.8432114124 / 1.466933489);
	LP_coeffs[6] = float_to_fr16(-1.466933489 / 1.466933489);
	LP_coeffs[7] = float_to_fr16(1.0 / 2.0);
	LP_coeffs[8] = float_to_fr16(2.0 / 2.0);
	LP_coeffs[9] = float_to_fr16(1.0 / 2.0);
    
	HP_coeffs[0] = float_to_fr16(-0.1368679255 );
	HP_coeffs[1] = float_to_fr16(0.4791774154);
	HP_coeffs[2] = float_to_fr16(1);
	HP_coeffs[3] = float_to_fr16(0.7790518403);
	HP_coeffs[4] = float_to_fr16(1);

	HP_coeffs[5] = float_to_fr16(-0.6737909913 );
	HP_coeffs[6] = float_to_fr16(1.07370162);
	HP_coeffs[7] = float_to_fr16(1);
	HP_coeffs[8] = float_to_fr16(-0.8766128421);
	HP_coeffs[9] = float_to_fr16(1);
	
   
                
    iir_init(LP_filt, LP_coeffs, LP_delay, 2);
    iir_init(HP_filt, HP_coeffs, HP_delay, 2);
	
	sysreg_write(reg_SYSCFG, 0x32);		//Initialize System Configuration Register
	Init_EBIU();
	Init_Flash();
	Init1836();
	Init_Sport0();
	Init_DMA();
	Init_Interrupts();
	Enable_DMA_Sport0();

	while(1);
}