Hi Richard,
Thanks for your comments, I modified the patch and resubmit it again:
>From 7636f69b74c34eca14c85fd2d518da6044b94f53 Mon Sep 17 00:00:00 2001
From: Dong Zhu <bluezhud...@gmail.com>
Date: Sun, 15 Sep 2013 17:12:52 +0800
This patch add a method into testptp.c to measure the time offset
between phc and system clock through the ioctl PTP_SYS_OFFSET.
Signed-off-by: Dong Zhu <bluezhud...@gmail.com>
---
Documentation/ptp/testptp.c | 40 ++++++++++++++++++++++++++++++++++++++--
1 file changed, 38 insertions(+), 2 deletions(-)
diff --git a/Documentation/ptp/testptp.c b/Documentation/ptp/testptp.c
index f59ded0..b6f6f47 100644
--- a/Documentation/ptp/testptp.c
+++ b/Documentation/ptp/testptp.c
@@ -112,6 +112,8 @@ static void usage(char *progname)
" -f val adjust the ptp clock frequency by 'val' ppb\n"
" -g get the ptp clock time\n"
" -h prints this message\n"
+ " -k val measure the time offset between phc and system
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"
@@ -133,8 +135,12 @@ int main(int argc, char *argv[])
struct itimerspec timeout;
struct sigevent sigevent;
+ struct ptp_clock_time *pct;
+ struct ptp_sys_offset *sysoff;
+
+
char *progname;
- int c, cnt, fd;
+ int i, c, cnt, fd;
char *device = DEVICE;
clockid_t clkid;
@@ -144,6 +150,8 @@ int main(int argc, char *argv[])
int extts = 0;
int gettime = 0;
int oneshot = 0;
+ int offset = 0;
+ int n_samples = 0;
int periodic = 0;
int perout = -1;
int pps = -1;
@@ -151,7 +159,7 @@ int main(int argc, char *argv[])
progname = strrchr(argv[0], '/');
progname = progname ? 1+progname : argv[0];
- while (EOF != (c = getopt(argc, argv, "a:A:cd:e:f:ghp:P:sSt:v"))) {
+ while (EOF != (c = getopt(argc, argv, "a:A:cd:e:f:ghk:p:P:sSt:v"))) {
switch (c) {
case 'a':
oneshot = atoi(optarg);
@@ -174,6 +182,10 @@ int main(int argc, char *argv[])
case 'g':
gettime = 1;
break;
+ case 'k':
+ offset = 1;
+ n_samples = atoi(optarg);
+ break;
case 'p':
perout = atoi(optarg);
break;
@@ -376,6 +388,30 @@ int main(int argc, char *argv[])
}
}
+ if (offset) {
+ 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("phc and system clock time offset request okay");
+
+ pct = &sysoff->ts[0];
+ for (i = 0; i < sysoff->n_samples; i++, pct++) {
+ printf("system time: %ld.%ld\n", pct->sec, pct->nsec);
+ pct++;
+ printf("phc time: %ld.%ld\n", pct->sec, pct->nsec);
+ }
+ printf("system time: %ld.%ld\n", pct->sec, pct->nsec);
+
+ free(sysoff);
+ }
+
close(fd);
return 0;
}
--
1.7.11.7
--
Best Regards,
Dong Zhu
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