Simple PPSAPI client for FreeBSD

ppsapi_client.c

// ppsapi_client.c
// Zach Davis 07-06-2013
// (C) Same license as FreeBSD

/*
 * Monitors a PPS port for events
 *
 * See sample Makefile at the bottom
 */

#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/timepps.h>

int main(int argc, char **argv)
{
	int fd;
	pps_handle_t ph;
	pps_params_t parms;
	int caps;
	pps_info_t pinfo;
	struct timespec timeout = { 0 };

	if (argc != 2) {
		printf("Usage: %s [serial port]\n\n", argv[0]);
		exit(0);
	}

	fd = open(argv[1], O_RDWR, 0);

	if (fd < 1) {
		perror("Error opening file");
		exit(-1);
	}

	if (time_pps_create(fd, &ph) != 0) {
		printf("Failed to create pps handle\n");
		exit(-1);
	}

	time_pps_getcap(ph, &caps);

	printf("Capabilities: 0x%X\n", caps);
	printf("CANWAIT: %d\n", (caps & PPS_CANWAIT) == 0);
	printf("CAPTUREASSERT: %d\n", (caps & PPS_CAPTUREASSERT) == 0);
	printf("OFFSETASSERT: %d\n", (caps & PPS_OFFSETASSERT) == 0);
	
	time_pps_getparams(ph, &parms);
	parms.assert_offset.tv_sec = 0;
	parms.assert_offset.tv_nsec = 0;
	parms.mode |= PPS_CAPTUREASSERT | PPS_OFFSETASSERT;
	time_pps_setparams(ph, &parms);

	printf("assert_seq, assert_time, clear_seq, clear_time, mode\n");
	while (1) {
		if (0 != time_pps_fetch(ph, PPS_TSFMT_TSPEC, &pinfo, &timeout)) {
			perror("Error fetching info");
			break;
		}

		printf("%d, %d.%09ld, %d, %d.%09ld, %x\n",
			   pinfo.assert_sequence, pinfo.assert_tu.tspec.tv_sec,
			   pinfo.assert_tu.tspec.tv_nsec, pinfo.clear_sequence,
			   pinfo.clear_tu.tspec.tv_sec, pinfo.clear_tu.tspec.tv_nsec,
			   pinfo.current_mode);

		sleep(1);
	}

	time_pps_destroy(ph);
	close(fd);

	return 0;
}

/*

# Makefile for ppsapi_client

all: ppsapi_client

ppsapi_client: ppsapi_client.c
	${CC} ${CFLAGS} -Wall -o ppsapi_client ppsapi_client.c

.PHONY: clean
clean:
	rm -f *.o *~ ppsapi_client

*/