Adding lab5

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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>
+// Some functions to help with configuring hardware
+#include "helper_functions_polling.h"
+
+
+// PI defined here for use in your code
+#define PI 3.141592653589793
+short x[] = {0, 0};
+double y[] = {0.0, 0.0};
+double a[] = {1, -1.875/2.125};
+double b[] = {0.125/2.125, 0.125/2.125};
+
+/******************************* 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 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()
+{
+	x[1] = x[0];
+	x[0] = mono_read_16Bit();
+	y[1] = y[0];
+	y[0] = b[0] * x[0] + b[1] * x[1] - a[1] * y[1];
+	
+	mono_write_16Bit((short)y[0]);
+}