06-05-2011, 03:52 PM
Code:
#include<stdio.h>
#include<math.h>
int m,n,x[30],h[30],y[30],i,j,temp[30],k,x2[30],a[30];
void main()
{
printf(" enter the length of the first sequence\n");
scanf("%d",&m);
printf(" enter the length of the second sequence\n");
scanf("%d",&n);
printf(" enter the first sequence\n");
for(i=0;i<m;i++)
scanf("%d",&x[i]);
printf(" enter the second sequence\n");
for(j=0;j<n;j++)
scanf("%d",&h[j]);
if(m-n!=0) /*If length of both sequences are not equal*/
{
if(m>n) /* Pad the smaller sequence with zero*/
{
for(i=n;i<m;i++)
h[i]=0;
n=m;
}
for(i=m;i<n;i++)
x[i]=0;
m=n;
}
y[0]=0;
a[0]=h[0];
for(j=1;j<n;j++) /*folding h(n) to h(-n)*/
a[j]=h[n-j];
/*Circular convolution*/
for(i=0;i<n;i++)
y[0]+=x[i]*a[i];
for(k=1;k<n;k++)
{
y[k]=0;
/*circular shift*/
for(j=1;j<n;j++)
x2[j]=a[j-1];
x2[0]=a[n-1];
for(i=0;i<n;i++)
{
a[i]=x2[i];
y[k]+=x[i]*x2[i];
}
}
/*displaying the result*/
printf(" the circular convolution is\n");
for(i=0;i<n;i++)
printf("%d \t",y[i]);
} Open Code Composer Studio; make sure the DSP kit is turned on.
Start a new project using ‘Project-new ‘ pull down menu, save it in a
separate directory(C:\CCStudio_v3.1\myprojects) with name cir conv.pjt.
Add the source files Circular Convolution
to the project using ‘Projectadd files to project’ pull down menu.
Add the linker command file hello.cmd.
(Path: C:\CCStudio_v3.1\tutorial\dsk6713\hello1\hello.cmd)
Add the run time support library file rts6700.lib
(Path: C:\CCStudio_v3.1\c6000\cgtools\lib\rts6700.lib)
Compile the program using the ‘Project-compile’ pull down menu or by
clicking the shortcut icon on the left side of program window.
Build the program using the ‘Project-Build’ pull down menu or by
clicking the shortcut icon on the left side of program window.
Load the program(lconv.out) in program memory of DSP chip using the
‘File-load program’ pull down menu.
