diff options
Diffstat (limited to 'contrib')
| -rw-r--r-- | contrib/ppscheck.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/contrib/ppscheck.c b/contrib/ppscheck.c index 6371639c..6b2d2255 100644 --- a/contrib/ppscheck.c +++ b/contrib/ppscheck.c @@ -1,3 +1,6 @@ +/* + * Watch a specified serial port for transitions that might be 1PPS. + */ #include <stdio.h> #include <string.h> #include <sys/types.h> @@ -15,9 +18,25 @@ struct assoc { char *string; }; +/* + * Possible pins for PPS: DCD, CTS, RTS, RI, DSR. Pinouts: + * + * DB9 DB25 Name Full name + * --- ---- ---- -------------------- + * 3 2 TXD --> Transmit Data + * 2 3 RXD <-- Receive Data + * 7 4 RTS --> Request To Send + * 8 5 CTS <-- Clear To Send + * 6 6 DSR <-- Data Set Ready + * 4 20 DTR --> Data Terminal Ready + * 1 8 DCD <-- Data Carrier Detect + * 9 22 RI <-- Ring Indicator + * 5 7 SG Signal ground + */ const static struct assoc hlines[] = { {TIOCM_CD, "TIOCM_CD"}, {TIOCM_RI, "TIOCM_RI"}, + {TIOCM_DSR, "TIOCM_DSR"}, {TIOCM_CTS, "TIOCM_CTS"}, }; @@ -37,7 +56,7 @@ int main(int argc, char *argv[]) (void)printf("Beginning wait...\n"); for (;;) { - if (ioctl(fd, TIOCMIWAIT, TIOCM_CD|TIOCM_CAR|TIOCM_RI|TIOCM_CTS) != 0) { + if (ioctl(fd, TIOCMIWAIT, TIOCM_CD|TIOCM_DSR|TIOCM_CAR|TIOCM_RI|TIOCM_CTS) != 0) { (void)fprintf(stderr, "PPS ioctl(TIOCMIWAIT) failed: %d %.40s\n", errno, strerror(errno)); |