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-/*************************************************************************************
-                   DEPARTMENT OF ELECTRICAL AND ELECTRONIC ENGINEERING
-                                    IMPERIAL COLLEGE LONDON
-
-                       EE 3.19: Real Time Digital Signal Processing
-                           Dr Paul Mitcheson and Daniel Harvey
-
-                                  LAB 3: Interrupt I/O
-
-                             ********* I N T I O. C **********
-
-  Demonstrates inputing and outputing data from the DSK's audio port using interrupts.
-
- *************************************************************************************
-                 Updated for use on 6713 DSK by Danny Harvey: May-Aug 2006
-                Updated for CCS V4 Sept 10
- ************************************************************************************/
-/*
- *    You should modify the code so that interrupts are used to service the
- *  audio port.
- */
-/**************************** Pre-processor statements ******************************/
-
-#include <stdlib.h>
-//  Included so program can make use of DSP/BIOS configuration tool.
-#include "dsp_bios_cfg.h"
-
-/* The file dsk6713.h must be included in every program that uses the BSL.  This
-   example also includes dsk6713_aic23.h because it uses the
-   AIC23 codec module (audio interface). */
-#include "dsk6713.h"
-#include "dsk6713_aic23.h"
-
-// math library (trig functions)
-#include <math.h>
-
-// Some functions to help with writing/reading the audio ports when using interrupts.
-#include <helper_functions_ISR.h>
-#include "Matlab/filter_coeff.txt"
-// Some functions to help with configuring hardware
-#include "helper_functions_polling.h"
-
-
-// PI defined here for use in your code
-#define PI 3.141592653589793
-#define N 249
-double buffer[N];
-unsigned int ptr = N-1;
-
-/******************************* Global declarations ********************************/
-
-/* Audio port configuration settings: these values set registers in the AIC23 audio
-   interface to configure it. See TI doc SLWS106D 3-3 to 3-10 for more info. */
-DSK6713_AIC23_Config Config = { \
-             /**********************************************************************/
-             /*   REGISTER                FUNCTION                  SETTINGS         */
-             /**********************************************************************/\
-    0x0017,  /* 0 LEFTINVOL  Left line input channel volume  0dB                   */\
-    0x0017,  /* 1 RIGHTINVOL Right line input channel volume 0dB                   */\
-    0x01f9,  /* 2 LEFTHPVOL  Left channel headphone volume   0dB                   */\
-    0x01f9,  /* 3 RIGHTHPVOL Right channel headphone volume  0dB                   */\
-    0x0011,  /* 4 ANAPATH    Analog audio path control       DAC on, Mic boost 20dB*/\
-    0x0000,  /* 5 DIGPATH    Digital audio path control      All Filters off       */\
-    0x0000,  /* 6 DPOWERDOWN Power down control              All Hardware on       */\
-    0x0043,  /* 7 DIGIF      Digital audio interface format  16 bit                */\
-    0x008d,  /* 8 SAMPLERATE Sample rate control             8 KHZ                 */\
-    0x0001   /* 9 DIGACT     Digital interface activation    On                    */\
-             /**********************************************************************/
-};
-
-
-// Codec handle:- a variable used to identify audio interface
-DSK6713_AIC23_CodecHandle H_Codec;
-
- /******************************* Function prototypes ********************************/
-void init_hardware(void);
-void init_HWI(void);
-void ISR_AIC(void);
-short non_circ_fir(void);
-/********************************** Main routine ************************************/
-void main(){
-    // initialize board and the audio port
-    init_hardware();
-
-    /* initialize hardware interrupts */
-    init_HWI();
-
-    /* loop indefinitely, waiting for interrupts */
-    while(1) {};
-}
-
-/********************************** init_hardware() **********************************/
-void init_hardware()
-{
-    // Initialize the board support library, must be called first
-    DSK6713_init();
-
-    // Start the AIC23 codec using the settings defined above in config
-    H_Codec = DSK6713_AIC23_openCodec(0, &Config);
-
-    /* Function below sets the number of bits in word used by MSBSP (serial port) for
-    receives from AIC23 (audio port). We are using a 32 bit packet containing two
-    16 bit numbers hence 32BIT is set for  receive */
-    MCBSP_FSETS(RCR1, RWDLEN1, 32BIT);
-
-    /* Configures interrupt to activate on each consecutive available 32 bits
-    from Audio port hence an interrupt is generated for each L & R sample pair */
-    MCBSP_FSETS(SPCR1, RINTM, FRM);
-
-    /* These commands do the same thing as above but applied to data transfers to
-    the audio port */
-    MCBSP_FSETS(XCR1, XWDLEN1, 32BIT);
-    MCBSP_FSETS(SPCR1, XINTM, FRM);
-}
-
-/********************************** init_HWI() **************************************/
-void init_HWI()
-{
-    IRQ_globalDisable();            // Globally disables interrupts
-    IRQ_nmiEnable();                // Enables the NMI interrupt (used by the debugger)
-    IRQ_map(IRQ_EVT_RINT1,4);       // Maps an event to a physical interrupt
-    IRQ_enable(IRQ_EVT_RINT1);      // Enables the event
-    IRQ_globalEnable();             // Globally enables interrupts
-}
-
-/******************** INTERRUPT SERVICE ROUTINE ***********************/
-void ISR_AIC()
-{
-	short sample_in, sample_out;
-	
-	sample_in = mono_read_16Bit();
-	buffer[ptr] = (float) sample_in / 32767.f;
-	sample_out = non_circ_fir();
-	mono_write_16Bit(sample_out);
-	
-	ptr--;
-	if (ptr == 0)
-		ptr = N-1;
-}
-
-// Perform linear convolution
-short non_circ_fir()
-{
-
-	double y = 0;
-	int M, i;
-	M = sizeof(b) / sizeof(b[0]);
-	for(i = 0; i < N; i++) {
-			y += buffer[i] * b[M-i-1];
-	}
-	return y*32767;
-}
-