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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>
#include <string.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
#include "Matlab/coeff.txt"
int N = sizeof(a)/sizeof(a[0]);
double* d;
/******************************* 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);
/********************************** Main routine ************************************/
void main(){
d = (double*)malloc(N * sizeof(double));
memset(d, 0.0, N * sizeof(double));
// 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()
{
int i = 0;
short x_in = mono_read_16Bit();
double y_out = d[0];
//Shift the values
for (; i < N-2; ++i) {
d[i] = d[i+1] + b[i] * x_in - a[i] * y_out;
}
d[N-1] = b[N-1] * x_in - a[N-1] * y_out;
mono_write_16Bit((short)d[0]);
}
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