mirror of
git://projects.qi-hardware.com/ben-wpan.git
synced 2024-12-23 16:53:21 +02:00
e76af7dd9a
- usrp/d.c: renamed to avg.c - usrp/p.c: renamed to peak.c - usrp/Makefile (all): renamed for d and p - usrp/plot: renamed to plpk
66 lines
844 B
C
66 lines
844 B
C
#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#define SAMPLES_DEFAULT 100
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static void average(int samples)
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{
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float c[2];
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int n = 0;
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float sum = 0;
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size_t s;
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while (1) {
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s = fread(c, sizeof(c), 1, stdin);
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if (!s) {
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if (!ferror(stdin))
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break;
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if (s < 0) {
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perror("read");
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exit(1);
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}
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}
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sum += hypot(c[0], c[1]);
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if (n++ % samples)
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continue;
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printf("%f\n", sum/samples);
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sum = 0;
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}
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}
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static void usage(const char *name)
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{
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fprintf(stderr,
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"usage: %s [samples]\n\n"
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" samples samples to average over (default: %d)\n"
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, name, SAMPLES_DEFAULT);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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int n = SAMPLES_DEFAULT;
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switch (argc) {
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case 1:
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break;
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case 2:
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n = atoi(argv[1]);
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if (n <= 0)
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usage(*argv);
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break;
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default:
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usage(*argv);
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}
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average(n);
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return 0;
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}
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