/*----------------------------------------------------------------------

	File:        irr_sa.c

	Description: Perform 1-stage and 4-stage quad IIR filter and output 

		     to left and right channel of line-out respectively.

		     * Note: cutoff of single stage is 6 kHz @ 20 kHz.

*************************************************************************/

#include <stdio.h>

#include <string.h>

#include <common.h>

#include <codec.h>

#include <mcbspdrv.h>

#include <board.h>

#include <stdlib.h>

#include <timer.h>

#include <intr.h>

#include <regs.h>



#define SAMPLING_RATE 20000



extern int inicodec (int sampling_rate);



#pragma CODE_SECTION(isr_rint0,".iprog") 



unsigned int x_ptr = 0x18c0000;

unsigned int y_ptr = 0x18c0004;





short delays[2]={0x0,0x0};

int mask = 0x0000ffff; 

short an1 = 0xd0b4;

short an2 = 0xe6fe;

short bn0 = 0x3217;

short bn1 = 0x642e;

short bn2 = 0x3217;







interrupt void isr_rint0 (void)

{





     iir_sa(an1,an2,bn0,bn1,bn2,delays,x_ptr,y_ptr,mask);

	

	return;

}



void Init_Interrupts ()

{

	intr_reset();                     // Reset the interrupt system,

					  // disable all interrupts.

	INTR_CLR_FLAG (CPU_INT15);        // Clear previous interrupt request

	INTR_ENABLE (CPU_INT15);          // Enable cpu interrupt line 15

	intr_map(CPU_INT15,ISN_RINT0);    // Link receive interrupt of serial

					  // port 0 to interrupt line 15.

	intr_hook (isr_rint0,CPU_INT15);  // Assign the interrupt service routine

}



void main(void)

{

	evm_init();                        // Initialise EVM board.

	inicodec (SAMPLING_RATE);         // Initialise codec, adjust sampling rate.

	Init_Interrupts ();               // Initialise interrupts and hook isr.

	INTR_GLOBAL_ENABLE();             // Enable global interrupt.



	for (;;);                         // Main loop, does nothing.

}