diff options
Diffstat (limited to 'ntpd/refclock_hpgps.c')
| -rw-r--r-- | ntpd/refclock_hpgps.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/ntpd/refclock_hpgps.c b/ntpd/refclock_hpgps.c index 7c801bb..5efd19e 100644 --- a/ntpd/refclock_hpgps.c +++ b/ntpd/refclock_hpgps.c @@ -41,6 +41,13 @@ * than 1 usec. The accuracy when operating in holdover is typically better * than 10 usec. per day. * + * The same driver also handles the HP Z3801A which is available surplus + * from the cell phone industry. It's popular with hams. + * It needs a different line setup: 19200 baud, 7 data bits, odd parity + * That is selected by adding "mode 1" to the server line in ntp.conf + * HP Z3801A code from Jeff Mock added by Hal Murray, Sep 2005 + * + * * The receiver should be operated with factory default settings. * Initial driver operation: expects the receiver to be already locked * to GPS, configured and able to output timecode format 2 messages. @@ -85,6 +92,7 @@ */ #define DEVICE "/dev/hpgps%d" /* device name and unit */ #define SPEED232 B9600 /* uart speed (9600 baud) */ +#define SPEED232Z B19200 /* uart speed (19200 baud) */ #define PRECISION (-10) /* precision assumed (about 1 ms) */ #define REFID "GPS\0" /* reference ID */ #define DESCRIPTION "HP 58503A GPS Time and Frequency Reference Receiver" @@ -152,11 +160,18 @@ hpgps_start( /* * Open serial port. Use CLK line discipline, if available. + * Default is HP 58503A, mode arg selects HP Z3801A */ (void)sprintf(device, DEVICE, unit); - if (!(fd = refclock_open(device, SPEED232, LDISC_CLK))) - return (0); - + /* mode parameter to server config line shares ttl slot */ + if ((peer->ttl == 1)) { + if (!(fd = refclock_open(device, SPEED232Z, + LDISC_CLK | LDISC_7O1))) + return (0); + } else { + if (!(fd = refclock_open(device, SPEED232, LDISC_CLK))) + return (0); + } /* * Allocate and initialize unit structure */ |
