lfsr.c

一个UWB仿真程序包

#include "lfsr.h"


void lfsr(int* register_content, int n)
{
  int k;
  int* register_buf;

  /* DEBUG */
  fprintf(stderr,"lfsr: n = %d\n",n);

  register_buf = (int *)malloc((size_t)(((n+1)*NB)*sizeof(int)));	

  if (!register_buf) {
    fprintf(stderr,"lfsr: allocation failure, bye!\n");
    exit(-1);
  }

  /* Initialize the buffer */
  for (k=0; k<NB-1; k++) {
    register_buf[k]=0;
  }
  register_buf[NB-1]=1;

  /* DEBUG */
  for (k=0; k<NB; k++) {
    fprintf(stderr,"%d ",register_buf[k]);
  }
  fprintf(stderr,"\n");


  /* Start to iterate */
  for (k=0; k<n*NB; k++) {
    register_buf[NB+k] = register_buf[k] ^ register_buf[k+1];
    register_content[k] = register_buf[NB+k];
  }

  free(register_buf);
	
}

void print_content(int* register_content, int n)
{
  int k,l;

  for (k=0; k<n; k++) {
    for (l=0; l<NB; l++) {
      fprintf(stdout,"%d ",register_content[(NB*k)+l]);
    }
    fprintf(stdout,"\n");
  }

}