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/*
* Periodic timing measurement for RTLinux.
*
* Copyright (C) 1999 FSM Labs (http://www.fsmlabs.com/)
* Written by Cort Dougan <cort@fsmlabs.com>
*/
#include <stdio.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <rtl_fifo.h>
#include <rtl_time.h>
struct samp
{
hrtime_t min, max, total;
hrtime_t period;
int cnt;
};
int main()
{
int fd0;
int n;
struct samp sm;
FILE *f;
int i = 0;
if ((fd0 = open("/dev/rtf0", O_RDONLY)) < 0)
{
fprintf(stderr, "Error opening /dev/rtf0\n");
exit(1);
}
if ( (f = fopen("gnuplot.out", "w")) == NULL )
{
fprintf(stderr,"Cannot open gnuplot.out\n");
perror("open");
exit(-1);
}
while (i < 50)
{
n = read(fd0, &sm, sizeof(sm));
#define NS_TO_US(x) ((x)/(NSECS_PER_SEC/1000000))
printf("min: %5ldus \tavg: %5ldus \tmax: %5ldus \tperiod: %5ldus\n",
(ulong)NS_TO_US((int)sm.min-(int)sm.period),
(ulong)NS_TO_US(((int)sm.total/(int)sm.cnt)-(int)sm.period),
(ulong)NS_TO_US((int)sm.max-(int)sm.period),
(ulong)NS_TO_US((int)sm.period));
fflush(stdout);
i++;
fprintf(f, "%d %ld %5ld %5ld %5ld\n",
i,
(ulong)NS_TO_US((int)sm.min/*-sm.period*/),
(ulong)NS_TO_US(((int)sm.total/(int)sm.cnt)/*-sm.period*/),
(ulong)NS_TO_US((int)sm.max/*-sm.period*/),
(ulong)NS_TO_US((int)sm.period));
fflush(f);
}
return 0;
}
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