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usrp/d: cleanup and allow number of samples to be set on command line

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This commit is contained in:
Werner Almesberger 2010-11-12 11:45:20 -03:00
parent d78dd4ee8c
commit 38e5b8a3a9
1 changed files with 37 additions and 5 deletions
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42
usrp/d.c
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@ -1,11 +1,12 @@
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#define N 100
#define SAMPLES_DEFAULT 100
int main(int argc, char **argv)
static void average(int samples)
{
float c[2];
int n = 0;
@ -20,14 +21,45 @@ int main(int argc, char **argv)
break;
if (s < 0) {
perror("read");
return 1;
exit(1);
}
}
sum += hypot(c[0], c[1]);
if (n++ % N)
if (n++ % samples)
continue;
printf("%f\n", sum/N);
printf("%f\n", sum/samples);
sum = 0;
}
}
static void usage(const char *name)
{
fprintf(stderr,
"usage: %s [samples]\n\n"
" samples samples to average over (default: %d)\n"
, name, SAMPLES_DEFAULT);
exit(1);
}
int main(int argc, char **argv)
{
int n = SAMPLES_DEFAULT;
switch (argc) {
case 1:
break;
case 2:
n = atoi(argv[1]);
if (n <= 0)
usage(*argv);
break;
default:
usage(*argv);
}
average(n);
return 0;
}