bool LinuxTimestamperGeneric::HWTimestamper_gettime
( Timestamp *system_time, Timestamp *device_time, uint32_t *local_clock,
uint32_t *nominal_clock_rate ) {
unsigned i;
struct ptp_sys_offset offset;
struct ptp_clock_time *pct;
struct ptp_clock_time *system_time_l, *device_time_l;
int64_t interval = LLONG_MAX;
if( phc_fd != -1 ) {
memset( &offset, 0, sizeof(offset));
offset.n_samples = PTP_MAX_SAMPLES;
ioctl( phc_fd, PTP_SYS_OFFSET, &offset );
pct = &offset.ts[0];
for( i = 0; i < offset.n_samples; ++i ) {
int64_t interval_t;
interval_t = pctns(pct_diff( pct+2*i+2, pct+2*i ));
if( interval_t < interval ) {
system_time_l = pct+2*i;
device_time_l = pct+2*i+1;
interval = interval_t;
}
}
*device_time = pctTimestamp( device_time_l );
*system_time = pctTimestamp( system_time_l );
return true;
}
return false;
}
static int64_t sysoff_estimate(struct ptp_clock_time *pct, int n_samples,
uint64_t *ts, int64_t *delay)
{
int64_t t1, t2, tp;
int64_t interval, offset;
int i;
for (i = 0; i < 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;
insertion_sort(i, interval, offset, (t2 + t1) / 2);
}
*ts = samples[0].timestamp;
*delay = samples[0].interval;
return samples[0].offset;
}
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 ptp_pin_desc desc;
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;
unsigned int i;
int 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 list_pins = 0;
int oneshot = 0;
int pct_offset = 0;
int n_samples = 0;
int periodic = 0;
int perout = -1;
int pin_index = -1, pin_func;
int pps = -1;
int seconds = 0;
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:lL:p:P:sSt:T: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 'l':
list_pins = 1;
break;
case 'L':
cnt = sscanf(optarg, "%d,%d", &pin_index, &pin_func);
if (cnt != 2) {
usage(progname);
return -1;
}
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 'T':
settime = 3;
seconds = 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"
" %d programmable pins\n"
" %d cross timestamping\n",
caps.max_adj,
caps.n_alarm,
caps.n_ext_ts,
caps.n_per_out,
caps.pps,
caps.n_pins,
caps.cross_timestamping);
}
}
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 (settime == 3) {
ts.tv_sec = seconds;
ts.tv_nsec = 0;
if (clock_settime(clkid, &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 (list_pins) {
int n_pins = 0;
if (ioctl(fd, PTP_CLOCK_GETCAPS, &caps)) {
perror("PTP_CLOCK_GETCAPS");
} else {
n_pins = caps.n_pins;
}
for (i = 0; i < n_pins; i++) {
desc.index = i;
if (ioctl(fd, PTP_PIN_GETFUNC, &desc)) {
perror("PTP_PIN_GETFUNC");
break;
}
printf("name %s index %u func %u chan %u\n",
desc.name, desc.index, desc.func, desc.chan);
}
}
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 (pin_index >= 0) {
memset(&desc, 0, sizeof(desc));
desc.index = pin_index;
desc.func = pin_func;
desc.chan = index;
if (ioctl(fd, PTP_PIN_SETFUNC, &desc)) {
perror("PTP_PIN_SETFUNC");
} else {
puts("set pin function 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: %lld.%u\n",
(pct+2*i)->sec, (pct+2*i)->nsec);
printf("phc time: %lld.%u\n",
(pct+2*i+1)->sec, (pct+2*i+1)->nsec);
printf("system time: %lld.%u\n",
(pct+2*i+2)->sec, (pct+2*i+2)->nsec);
printf("system/phc clock time offset is %" PRId64 " ns\n"
"system clock time delay is %" PRId64 " ns\n",
offset, interval);
}
free(sysoff);
}
close(fd);
return 0;
}
