Try to run this program to see what the PPS-API finds. You give it the

/* $NetBSD: pps-api.c,v 1.5 2020/05/25 20:47:37 christos Exp $ */

/*

Try to run this program to see what the PPS-API finds. You give it the
device as argument and you may have to modify the pp.mode = BLA assignment.

Poul-Henning

*/

#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <err.h>
#include <sys/types.h>
#include <time.h>
#include <sys/timepps.h>
#include <sys/termios.h>

#define timespecsub(vvp, uvp) \
do { \
(vvp)->tv_sec -= (uvp)->tv_sec; \
(vvp)->tv_nsec -= (uvp)->tv_nsec; \
if ((vvp)->tv_nsec < 0) { \
(vvp)->tv_sec--; \
(vvp)->tv_nsec += 1000000000; \
} \
} while (0)

void
Chew(struct timespec *tsa, struct timespec *tsc, unsigned sa, unsigned sc)
{
static int idx;
struct timespec ts;

printf("%d.%09d ", tsa->tv_sec, tsa->tv_nsec);
printf("%d.%09d ", tsc->tv_sec, tsc->tv_nsec);
printf("%u %u ", sa, sc);

ts = *tsc;
timespecsub(&ts,tsa);
printf("%.9f ", ts.tv_sec + ts.tv_nsec / 1e9);
printf("\n");
fflush(stdout);
}

int
main(int argc, char **argv)
{
int fd;
pps_info_t pi;
pps_params_t pp;
pps_handle_t ph;
int i, mode;
u_int olda, oldc;
double d = 0;
struct timespec to;

if (argc < 2)
argv[1] = "/dev/cuaa1";
setbuf(stdout, 0);
fd = open(argv[1], O_RDONLY);
if (fd < 0)
err(1, argv[1]);
i = time_pps_create(fd, &ph);
if (i < 0)
err(1, "time_pps_create");

i = time_pps_getcap(ph, &mode);
if (i < 0)
err(1, "time_pps_getcap");

pp.mode = PPS_CAPTUREASSERT | PPS_ECHOASSERT;
pp.mode = PPS_CAPTUREBOTH;
/* pp.mode = PPS_CAPTUREASSERT; */

i = time_pps_setparams(ph, &pp);
if (i < 0)
err(1, "time_pps_setparams");

while (1) {
to.tv_nsec = 0;
to.tv_sec = 0;
i = time_pps_fetch(ph, PPS_TSFMT_TSPEC, &pi, &to);
if (i < 0)
err(1, "time_pps_fetch");
if (olda == pi.assert_sequence &&
oldc == pi.clear_sequence) {
usleep(10000);
continue;
}

Chew(&pi.assert_timestamp, &pi.clear_timestamp,
pi.assert_sequence, pi.clear_sequence);
olda = pi.assert_sequence;
oldc = pi.clear_sequence;
}

return(0);
}