448 lines
10 KiB
C
448 lines
10 KiB
C
/*
|
|
* PTP 1588 clock support - User space test program
|
|
*
|
|
* Copyright (C) 2010 OMICRON electronics GmbH
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <math.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/time.h>
|
|
#include <sys/timex.h>
|
|
#include <sys/types.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
#include <linux/ptp_clock.h>
|
|
|
|
#define DEVICE "/dev/ptp0"
|
|
|
|
#ifndef ADJ_SETOFFSET
|
|
#define ADJ_SETOFFSET 0x0100
|
|
#endif
|
|
|
|
#ifndef CLOCK_INVALID
|
|
#define CLOCK_INVALID -1
|
|
#endif
|
|
|
|
/* When glibc offers the syscall, this will go away. */
|
|
#include <sys/syscall.h>
|
|
static int clock_adjtime(clockid_t id, struct timex *tx)
|
|
{
|
|
return syscall(__NR_clock_adjtime, id, tx);
|
|
}
|
|
|
|
static clockid_t get_clockid(int fd)
|
|
{
|
|
#define CLOCKFD 3
|
|
#define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD)
|
|
|
|
return FD_TO_CLOCKID(fd);
|
|
}
|
|
|
|
static void handle_alarm(int s)
|
|
{
|
|
printf("received signal %d\n", s);
|
|
}
|
|
|
|
static int install_handler(int signum, void (*handler)(int))
|
|
{
|
|
struct sigaction action;
|
|
sigset_t mask;
|
|
|
|
/* Unblock the signal. */
|
|
sigemptyset(&mask);
|
|
sigaddset(&mask, signum);
|
|
sigprocmask(SIG_UNBLOCK, &mask, NULL);
|
|
|
|
/* Install the signal handler. */
|
|
action.sa_handler = handler;
|
|
action.sa_flags = 0;
|
|
sigemptyset(&action.sa_mask);
|
|
sigaction(signum, &action, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long ppb_to_scaled_ppm(int ppb)
|
|
{
|
|
/*
|
|
* The 'freq' field in the 'struct timex' is in parts per
|
|
* million, but with a 16 bit binary fractional field.
|
|
* Instead of calculating either one of
|
|
*
|
|
* scaled_ppm = (ppb / 1000) << 16 [1]
|
|
* scaled_ppm = (ppb << 16) / 1000 [2]
|
|
*
|
|
* we simply use double precision math, in order to avoid the
|
|
* truncation in [1] and the possible overflow in [2].
|
|
*/
|
|
return (long) (ppb * 65.536);
|
|
}
|
|
|
|
static int64_t pctns(struct ptp_clock_time *t)
|
|
{
|
|
return t->sec * 1000000000LL + t->nsec;
|
|
}
|
|
|
|
static void usage(char *progname)
|
|
{
|
|
fprintf(stderr,
|
|
"usage: %s [options]\n"
|
|
" -a val request a one-shot alarm after 'val' seconds\n"
|
|
" -A val request a periodic alarm every 'val' seconds\n"
|
|
" -c query the ptp clock's capabilities\n"
|
|
" -d name device to open\n"
|
|
" -e val read 'val' external time stamp events\n"
|
|
" -f val adjust the ptp clock frequency by 'val' ppb\n"
|
|
" -g get the ptp clock time\n"
|
|
" -h prints this message\n"
|
|
" -i val index for event/trigger\n"
|
|
" -k val measure the time offset between system and phc clock\n"
|
|
" for 'val' times (Maximum 25)\n"
|
|
" -p val enable output with a period of 'val' nanoseconds\n"
|
|
" -P val enable or disable (val=1|0) the system clock PPS\n"
|
|
" -s set the ptp clock time from the system time\n"
|
|
" -S set the system time from the ptp clock time\n"
|
|
" -t val shift the ptp clock time by 'val' seconds\n",
|
|
progname);
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
struct ptp_clock_caps caps;
|
|
struct ptp_extts_event event;
|
|
struct ptp_extts_request extts_request;
|
|
struct ptp_perout_request perout_request;
|
|
struct timespec ts;
|
|
struct timex tx;
|
|
|
|
static timer_t timerid;
|
|
struct itimerspec timeout;
|
|
struct sigevent sigevent;
|
|
|
|
struct ptp_clock_time *pct;
|
|
struct ptp_sys_offset *sysoff;
|
|
|
|
|
|
char *progname;
|
|
int i, c, cnt, fd;
|
|
|
|
char *device = DEVICE;
|
|
clockid_t clkid;
|
|
int adjfreq = 0x7fffffff;
|
|
int adjtime = 0;
|
|
int capabilities = 0;
|
|
int extts = 0;
|
|
int gettime = 0;
|
|
int index = 0;
|
|
int oneshot = 0;
|
|
int pct_offset = 0;
|
|
int n_samples = 0;
|
|
int periodic = 0;
|
|
int perout = -1;
|
|
int pps = -1;
|
|
int settime = 0;
|
|
|
|
int64_t t1, t2, tp;
|
|
int64_t interval, offset;
|
|
|
|
progname = strrchr(argv[0], '/');
|
|
progname = progname ? 1+progname : argv[0];
|
|
while (EOF != (c = getopt(argc, argv, "a:A:cd:e:f:ghi:k:p:P:sSt:v"))) {
|
|
switch (c) {
|
|
case 'a':
|
|
oneshot = atoi(optarg);
|
|
break;
|
|
case 'A':
|
|
periodic = atoi(optarg);
|
|
break;
|
|
case 'c':
|
|
capabilities = 1;
|
|
break;
|
|
case 'd':
|
|
device = optarg;
|
|
break;
|
|
case 'e':
|
|
extts = atoi(optarg);
|
|
break;
|
|
case 'f':
|
|
adjfreq = atoi(optarg);
|
|
break;
|
|
case 'g':
|
|
gettime = 1;
|
|
break;
|
|
case 'i':
|
|
index = atoi(optarg);
|
|
break;
|
|
case 'k':
|
|
pct_offset = 1;
|
|
n_samples = atoi(optarg);
|
|
break;
|
|
case 'p':
|
|
perout = atoi(optarg);
|
|
break;
|
|
case 'P':
|
|
pps = atoi(optarg);
|
|
break;
|
|
case 's':
|
|
settime = 1;
|
|
break;
|
|
case 'S':
|
|
settime = 2;
|
|
break;
|
|
case 't':
|
|
adjtime = atoi(optarg);
|
|
break;
|
|
case 'h':
|
|
usage(progname);
|
|
return 0;
|
|
case '?':
|
|
default:
|
|
usage(progname);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
fd = open(device, O_RDWR);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "opening %s: %s\n", device, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
clkid = get_clockid(fd);
|
|
if (CLOCK_INVALID == clkid) {
|
|
fprintf(stderr, "failed to read clock id\n");
|
|
return -1;
|
|
}
|
|
|
|
if (capabilities) {
|
|
if (ioctl(fd, PTP_CLOCK_GETCAPS, &caps)) {
|
|
perror("PTP_CLOCK_GETCAPS");
|
|
} else {
|
|
printf("capabilities:\n"
|
|
" %d maximum frequency adjustment (ppb)\n"
|
|
" %d programmable alarms\n"
|
|
" %d external time stamp channels\n"
|
|
" %d programmable periodic signals\n"
|
|
" %d pulse per second\n",
|
|
caps.max_adj,
|
|
caps.n_alarm,
|
|
caps.n_ext_ts,
|
|
caps.n_per_out,
|
|
caps.pps);
|
|
}
|
|
}
|
|
|
|
if (0x7fffffff != adjfreq) {
|
|
memset(&tx, 0, sizeof(tx));
|
|
tx.modes = ADJ_FREQUENCY;
|
|
tx.freq = ppb_to_scaled_ppm(adjfreq);
|
|
if (clock_adjtime(clkid, &tx)) {
|
|
perror("clock_adjtime");
|
|
} else {
|
|
puts("frequency adjustment okay");
|
|
}
|
|
}
|
|
|
|
if (adjtime) {
|
|
memset(&tx, 0, sizeof(tx));
|
|
tx.modes = ADJ_SETOFFSET;
|
|
tx.time.tv_sec = adjtime;
|
|
tx.time.tv_usec = 0;
|
|
if (clock_adjtime(clkid, &tx) < 0) {
|
|
perror("clock_adjtime");
|
|
} else {
|
|
puts("time shift okay");
|
|
}
|
|
}
|
|
|
|
if (gettime) {
|
|
if (clock_gettime(clkid, &ts)) {
|
|
perror("clock_gettime");
|
|
} else {
|
|
printf("clock time: %ld.%09ld or %s",
|
|
ts.tv_sec, ts.tv_nsec, ctime(&ts.tv_sec));
|
|
}
|
|
}
|
|
|
|
if (settime == 1) {
|
|
clock_gettime(CLOCK_REALTIME, &ts);
|
|
if (clock_settime(clkid, &ts)) {
|
|
perror("clock_settime");
|
|
} else {
|
|
puts("set time okay");
|
|
}
|
|
}
|
|
|
|
if (settime == 2) {
|
|
clock_gettime(clkid, &ts);
|
|
if (clock_settime(CLOCK_REALTIME, &ts)) {
|
|
perror("clock_settime");
|
|
} else {
|
|
puts("set time okay");
|
|
}
|
|
}
|
|
|
|
if (extts) {
|
|
memset(&extts_request, 0, sizeof(extts_request));
|
|
extts_request.index = index;
|
|
extts_request.flags = PTP_ENABLE_FEATURE;
|
|
if (ioctl(fd, PTP_EXTTS_REQUEST, &extts_request)) {
|
|
perror("PTP_EXTTS_REQUEST");
|
|
extts = 0;
|
|
} else {
|
|
puts("external time stamp request okay");
|
|
}
|
|
for (; extts; extts--) {
|
|
cnt = read(fd, &event, sizeof(event));
|
|
if (cnt != sizeof(event)) {
|
|
perror("read");
|
|
break;
|
|
}
|
|
printf("event index %u at %lld.%09u\n", event.index,
|
|
event.t.sec, event.t.nsec);
|
|
fflush(stdout);
|
|
}
|
|
/* Disable the feature again. */
|
|
extts_request.flags = 0;
|
|
if (ioctl(fd, PTP_EXTTS_REQUEST, &extts_request)) {
|
|
perror("PTP_EXTTS_REQUEST");
|
|
}
|
|
}
|
|
|
|
if (oneshot) {
|
|
install_handler(SIGALRM, handle_alarm);
|
|
/* Create a timer. */
|
|
sigevent.sigev_notify = SIGEV_SIGNAL;
|
|
sigevent.sigev_signo = SIGALRM;
|
|
if (timer_create(clkid, &sigevent, &timerid)) {
|
|
perror("timer_create");
|
|
return -1;
|
|
}
|
|
/* Start the timer. */
|
|
memset(&timeout, 0, sizeof(timeout));
|
|
timeout.it_value.tv_sec = oneshot;
|
|
if (timer_settime(timerid, 0, &timeout, NULL)) {
|
|
perror("timer_settime");
|
|
return -1;
|
|
}
|
|
pause();
|
|
timer_delete(timerid);
|
|
}
|
|
|
|
if (periodic) {
|
|
install_handler(SIGALRM, handle_alarm);
|
|
/* Create a timer. */
|
|
sigevent.sigev_notify = SIGEV_SIGNAL;
|
|
sigevent.sigev_signo = SIGALRM;
|
|
if (timer_create(clkid, &sigevent, &timerid)) {
|
|
perror("timer_create");
|
|
return -1;
|
|
}
|
|
/* Start the timer. */
|
|
memset(&timeout, 0, sizeof(timeout));
|
|
timeout.it_interval.tv_sec = periodic;
|
|
timeout.it_value.tv_sec = periodic;
|
|
if (timer_settime(timerid, 0, &timeout, NULL)) {
|
|
perror("timer_settime");
|
|
return -1;
|
|
}
|
|
while (1) {
|
|
pause();
|
|
}
|
|
timer_delete(timerid);
|
|
}
|
|
|
|
if (perout >= 0) {
|
|
if (clock_gettime(clkid, &ts)) {
|
|
perror("clock_gettime");
|
|
return -1;
|
|
}
|
|
memset(&perout_request, 0, sizeof(perout_request));
|
|
perout_request.index = index;
|
|
perout_request.start.sec = ts.tv_sec + 2;
|
|
perout_request.start.nsec = 0;
|
|
perout_request.period.sec = 0;
|
|
perout_request.period.nsec = perout;
|
|
if (ioctl(fd, PTP_PEROUT_REQUEST, &perout_request)) {
|
|
perror("PTP_PEROUT_REQUEST");
|
|
} else {
|
|
puts("periodic output request okay");
|
|
}
|
|
}
|
|
|
|
if (pps != -1) {
|
|
int enable = pps ? 1 : 0;
|
|
if (ioctl(fd, PTP_ENABLE_PPS, enable)) {
|
|
perror("PTP_ENABLE_PPS");
|
|
} else {
|
|
puts("pps for system time request okay");
|
|
}
|
|
}
|
|
|
|
if (pct_offset) {
|
|
if (n_samples <= 0 || n_samples > 25) {
|
|
puts("n_samples should be between 1 and 25");
|
|
usage(progname);
|
|
return -1;
|
|
}
|
|
|
|
sysoff = calloc(1, sizeof(*sysoff));
|
|
if (!sysoff) {
|
|
perror("calloc");
|
|
return -1;
|
|
}
|
|
sysoff->n_samples = n_samples;
|
|
|
|
if (ioctl(fd, PTP_SYS_OFFSET, sysoff))
|
|
perror("PTP_SYS_OFFSET");
|
|
else
|
|
puts("system and phc clock time offset request okay");
|
|
|
|
pct = &sysoff->ts[0];
|
|
for (i = 0; i < sysoff->n_samples; i++) {
|
|
t1 = pctns(pct+2*i);
|
|
tp = pctns(pct+2*i+1);
|
|
t2 = pctns(pct+2*i+2);
|
|
interval = t2 - t1;
|
|
offset = (t2 + t1) / 2 - tp;
|
|
|
|
printf("system time: %ld.%ld\n",
|
|
(pct+2*i)->sec, (pct+2*i)->nsec);
|
|
printf("phc time: %ld.%ld\n",
|
|
(pct+2*i+1)->sec, (pct+2*i+1)->nsec);
|
|
printf("system time: %ld.%ld\n",
|
|
(pct+2*i+2)->sec, (pct+2*i+2)->nsec);
|
|
printf("system/phc clock time offset is %ld ns\n"
|
|
"system clock time delay is %ld ns\n",
|
|
offset, interval);
|
|
}
|
|
|
|
free(sysoff);
|
|
}
|
|
|
|
close(fd);
|
|
return 0;
|
|
}
|