Hi,
My application is the simple audio data acquisition system using the EVM5515. I have designed the timer ISR where I am acquiring the data from the codec. The timer designed at 12Khz frequency, I am using the DSPLIB for implementing the FIR filter when I am using these filters in timer ISR the frequency of the timer becomes 2Khz. That means the FIR filter is taking more timing to execute. I am attaching the timer.c and the linker file with this code. So please explain me am I missing something in the code. I am attaching timer.c and filter dop_filt.c code files. I have also attached the command file in zip format.
#include "dopp_filt.h"
//unsigned char filt_flg=0;
#if 1
//short test(DATA *r, DATA *rtest, short n, DATA maxerror);
void Filt_test_x(void)
{
short eflag1= PASS;
DATA *dbptr = &db_x[0];
unsigned char i;
for (i = 0; i < NX; i++) r_x[i] = 0; // clear output buffer (optional)
// if(filt_flg==0)
for (i = 0; i < (NH+2); i++) db_x[i] = 0; // clear delay buffer (a must)
// filt_flg=1;
// compute
fir(x, h, r_x, dbptr, NX, NH);
// test
// eflag1 = test (r, rtest, NX, MAXERROR);
}
void Filt_test_y(void)
{
short eflag1= PASS;
DATA *dbptr = &db_y[0];
unsigned char i;
for (i = 0; i < NX; i++) r_y[i] = 0; // clear output buffer (optional)
// if(filt_flg==0)
for (i = 0; i < (NH+2); i++) db_y[i] = 0; // clear delay buffer (a must)
// filt_flg=1;
// compute
fir(y, h, r_y, dbptr, NX, NH);
// test
// eflag1 = test (r, rtest, NX, MAXERROR);
}
void Filt_LP_x(void)
{
short eflag1= PASS;
DATA *dbptr = &db_xLP[0];
unsigned char i;
for (i = 0; i < NX; i++) r_xLP[i] = 0; // clear output buffer (optional)
// if(filt_flg==0)
for (i = 0; i < (NH+2); i++) db_xLP[i] = 0; // clear delay buffer (a must)
// filt_flg=1;
// compute
fir(x_LP, h_LP, r_xLP, dbptr, NX, NH);
// test
// eflag1 = test (r, rtest, NX, MAXERROR);
}
void Filt_LP_y(void)
{
short eflag1= PASS;
DATA *dbptr = &db_yLP[0];
unsigned char i;
for (i = 0; i < NX; i++) r_yLP[i] = 0; // clear output buffer (optional)
// if(filt_flg==0)
for (i = 0; i < (NH+2); i++) db_yLP[i] = 0; // clear delay buffer (a must)
// filt_flg=1;
// compute
fir(y_LP, h_LP, r_yLP, dbptr, NX, NH);
// test
// eflag1 = test (r, rtest, NX, MAXERROR);
}
#endif
#if 0
short test(DATA *r, DATA *rtest, short n, DATA maxerror)
{
short i;
short eflag = PASS; // error flag or index into r vector where error
DATA elevel = 0; // error level at failing eflag index location
DATA emax = 0; // max error level detected across when NOERROR
for (i=0;i<n;i++)
{
elevel = ABSVAL(rtest[i] - r[i]);
if ( elevel > maxerror)
{
eflag =i; // if error --> eflag = index and emax= max error
emax = elevel; // if no error --> eflag = -1 and emax = max error
break;
}
else
if (elevel>emax) emax = elevel;
}
// Pass to Host: eflag and emax
return(eflag);
}
#endif
#if 0
#define Ntap 80
#define DCgain 32768
Int16 FIRCoef[Ntap] = {
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
-4,
10,
-7,
-28,
114,
-190,
-30,
1153,
-3784,
7245,
23809,
7245,
-3784,
1153,
-30,
-190,
114,
-28,
-7,
10,
-4,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
};
Int16 x[Ntap]={0};
Int16 fir(Int16 NewSample)
{
//input samples
Int32 y=0; //output sample
int n;
//shift the old samples
for(n=Ntap-1; n>0; n--)
x[n] = x[n-1];
//Calculate the new output
x[0] = NewSample;
for(n=0; n<Ntap; n++)
y += FIRCoef[n] * x[n];
return y / DCgain;
}
#endif
/**********************************************************************
**+-----------------------------------------------------------------+**
**| **** |**
**| **** |**
**| ******o*** |**
**| ********_///_**** |**
**| ***** /_//_/ **** |**
**| ** ** (__/ **** |**
**| ********* |**
**| **** |**
**| *** |**
**| |**
**| Copyright (c) 2006 - 2010 Texas Instruments Incorporated |**
**| ALL RIGHTS RESERVED |**
**| |**
**| Permission is hereby granted to licensees of Texas Instruments |**
**| Incorporated (TI) products to use this computer program for |**
**| the sole purpose of implementing a licensee product based |**
**| on TI products.No other rights to reproduce, use, or |**
**| disseminate this computer program, whether in part or in whole, |**
**| are granted.TI makes no representation or warranties with |**
**| respect to the performance of this computer program, and |**
**| specifically disclaims any responsibility for any damages, |**
**| special or consequential,connected with the use of this program.|**
**| |**
**+-----------------------------------------------------------------+**
**********************************************************************/
#include "data_types.h"
#include "timer.h"
#include "register_cpu.h"
#include "evm5515.h"
extern Int16 RX_Buff_Left[],RX_Buff_Right[],Buffer_Index;
extern Int8 Buffer_Full,Data_ready;
/////*Code added by Nitin*/
extern void Filt_test_y();
extern Int32 process_buf[];
extern void Filt_test_x();
extern void Filt_LP_x();
extern void Filt_LP_y();
extern Int16 x[];
extern Int16 y[];
extern Int16 x_LP[];
extern Int16 y_LP[];
extern Int16 r_x[];
extern Int16 r_y[];
extern Int16 r_xLP[];
extern Int16 r_yLP[];
Int8 Buff_full_flg=0;
Int16 RX_Right_filt[256],RX_Left_filt[256];
///*********************/
void Timer0Init(void)
{
/* Timer0 Initialization */
// timer interval 10msec
// prescale = 0 (devide by 2)
// 100/2 = 50MHz ==> 20 nsec
// 10msec/20nsec = 500000 (0x7A120)
/* TIM0 EN | AutoReload disable | Prescale = 0(100/2 = 50MHz) ==> 20nsec */
//*CPU_TIM0_CTRL = 0x8002; // autoReload
*CPU_TIM0_CTRL = 0x8000; // disable autoReload
//*CPU_TIM0_PLWR = 0xA120; // for 100Hz
//*CPU_TIM0_PHWR = 0x0007;
//*CPU_TIM0_PLWR = 0x0823; //for 24KHz timer
//*CPU_TIM0_PHWR = 0x0000;
// *CPU_TIM0_PLWR = 0x1388; //for 10KHz timer
// *CPU_TIM0_PHWR = 0x0000;
*CPU_TIM0_PLWR = 0x1047; //for 12KHz timer
*CPU_TIM0_PHWR = 0x0000;
*CPU_TIM0_CLWR = 0x0000;
*CPU_TIM0_CHWR = 0x0000;
/* Clearing timer Aggregation register*/
*CPU_TIMINT_AGGR = 0x0007;
/* enable timer0 int flag*/
*CPU_TIM0_IER = 0x0001;
}
void StartTimer0(void)
{
/* Start the Timer 0*/
*CPU_TIM0_CTRL = *CPU_TIM0_CTRL | 0x0001;
}
interrupt void Timer_isr(void)
{
Int16 DataL=0,DataR=0;
// EVM5515_LED_on(0);
while((0x08 & I2S2_IR) == 0); // Wait for receive interrupt to be pending
DataL = I2S2_W0_MSW_R; // 16 bit left channel received audio data
DataR = I2S2_W1_MSW_R; // 16 bit right channel received audio data
/* Write Digital audio */
while((0x20 & I2S2_IR) == 0); // Wait for receive interrupt to be pending
I2S2_W0_MSW_W = DataL; // 16 bit left channel transmit audio data
I2S2_W1_MSW_W = DataR ; // 16 bit right channel transmit audio data
x[Buffer_Index]= DataL;
Filt_test_x();
x_LP[Buffer_Index]=r_x[Buffer_Index];
// x_LP[Buffer_Index]= DataL;
Filt_LP_x();
RX_Left_filt[Buffer_Index]=r_xLP[Buffer_Index];
y[Buffer_Index]= DataR;
Filt_test_y();
y_LP[Buffer_Index]=r_y[Buffer_Index];
// y_LP[Buffer_Index]= DataR;
Filt_LP_y();
RX_Right_filt[Buffer_Index]=r_yLP[Buffer_Index];
RX_Buff_Left[Buffer_Index]=DataL;
RX_Buff_Right[Buffer_Index++]=DataR;
Buffer_Full = (Buffer_Index % 255);
if(Buffer_Full == 0)
{
Buffer_Index = 0;
// Buff_full_flg=1;
}
Data_ready = 1;
#endif
// clear timer int flag
IFR0 = IFR0&0x0010;
/* clear timer0 int flag*/
*CPU_TIM0_IER = 0x0001;
/* Clear Timer0 bit in Timer Aggregate register*/
*CPU_TIMINT_AGGR = *CPU_TIMINT_AGGR | 0x0001 ;
StartTimer0();
}
