projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| bd43ea90 GW |
1 | This version of NTP was converted to the BSD-style Makefile system by |
| 2 | Garrett Wollman (wollman@freefall.cdrom.com); it is based on version | |
| f064a358 | 3 | 3.3p (late beta) from the University of Delaware. |
| bd43ea90 GW |
4 | |
| 5 | Besides the Makefile changes, the DES code has been completely removed | |
| 6 | in order to make this code exportable. If you have a legal copy of | |
| 7 | `authdes.c', you can just add it to the lib/ directory and add `-DDES' | |
| 8 | to the AUTHDEFS in Makefile.inc. | |
| 9 | ||
| fa1a6f22 | 10 | You can change CLOCKDEFS in the same file to add other reference clocks. |
| f555592b PHK |
11 | |
| 12 | ---------------------------------------------------- | |
| 13 | Support for Conrad electronic's "DCF-77 Uhr, Mobil". | |
| 14 | ---------------------------------------------------- | |
| 15 | Conrad electronic in Germany,, Phone (+49) 962230111 (?), sells a gadget | |
| 16 | called "DCF77 Uhr, mobil", which is a DCF77 timecode receiver with a | |
| 17 | rs-232 interface. The price is around DM130. | |
| 18 | 9-pin interface is Order# 97 94 57 66 | |
| 19 | 25-pin interface is Order# 97 94 81 66 | |
| 20 | ||
| 21 | You must define | |
| 22 | -DDCF77 -DPPS -DFREEBSD_CONRAD -DDEBUG | |
| 23 | when you compile xntpd. You can later remove -DDEBUG, if you feel like it. | |
| 24 | ||
| 25 | You must also have | |
| 26 | options COM_BIDIR | |
| 27 | defined in your kernel, and finally the ttyport you intend to use must | |
| 28 | have special interrupt vector: | |
| 29 | device sio1 at isa? port "IO_COM2" tty irq 3 vector siointrts | |
| 30 | ^^^^^^^^^^^^ | |
| 31 | connect the radio-clock to the tty port and link it to /dev/refclock-0: | |
| 32 | ||
| 33 | cd /dev | |
| 34 | sh MAKEDEV cua1 | |
| 35 | ln -s /dev/cua01 /dev/refclock-0 | |
| 36 | ||
| 37 | make a directory to gather statistics in: | |
| 38 | mkdir /var/tmp/ntp | |
| 39 | ||
| 40 | Create a /etc/ntp.conf along these lines: | |
| 41 | ||
| 42 | # DCF77 without PPS | |
| 43 | server 127.127.8.20 | |
| 44 | # DCF77 with PPS | |
| 45 | #server 127.127.8.148 prefer | |
| 46 | ||
| 47 | driftfile /var/tmp/ntp/ntp.drift | |
| 48 | statsdir /var/tmp/ntp | |
| 49 | statistics loopstats | |
| 50 | statistics peerstats | |
| 51 | statistics clockstats | |
| 52 | filegen peerstats file peerstats type day enable | |
| 53 | filegen loopstats file loopstats type day enable | |
| 54 | filegen clockstats file clockstats type day enable | |
| 55 | ||
| 56 | Try to start it: | |
| 57 | comcontrol ttyd1 bidir | |
| 58 | tickadj -A | |
| 59 | xntpd -d -d -d | |
| 60 | ||
| 61 | You should see the red LED flash on the receiver every second now. You | |
| 62 | may have to experiment a bit with the location, and possibly adjust the | |
| 63 | minute variable resistor inside to get a good signal. Be aware, that just | |
| 64 | because you see the light flash, is not the same as the signal being | |
| 65 | received by the computer. The chip doing the work in the reciver uses | |
| 66 | less than 1 micro-ampere, so even if RTS isn't pulled low, it will happily | |
| 67 | receive, but be unable to buffer the signal to the rs-232 levels needed. | |
| 68 | ||
| 69 | You can see what's going on in /var/log/messages, and query the | |
| 70 | daemon using xntpdc and ntpq, in particular the "clockvar" command | |
| 71 | of ntpq will tell about the clocks healt. | |
| 72 | ||
| 73 | I live in Slagelse, Denmark, which is ~1000 Km from Mainflingen, yet | |
| 74 | I have +/- 2 ms precision from this cheap gadget. If you have a very | |
| 75 | stable signal, you can use the 'pps' address instead to improve your | |
| 76 | timing. | |
| 77 | ||
| 78 | Have fun... Poul-Henning Kamp <phk@login.dkuug.dk> |