On Mon, Jan 24, 2011 at 08:46 UTC, David J Taylor <david-tay...@blueyonder.co.uk.invalid> wrote: > Is there simple DCF77 support in the Windows NTP port? This would be for > the simple receiver described here: > > http://www.rrs-web.net/in3her/dcf77_32.html
I'm not sure about that particular hardware, but most of the DCF77 drivers in ntpd are part of driver 8 (confusingly referred to as either GENERIC or parse, implemented in refclock_parse.c): http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver8.html > A friend has one of these devices and is interested in syncing multiple PCs. > I only see manufacturer-specific drivers (types 38, 39 and 44) and I'm > unsure whether the hardware above is similar to one of these types, and > whether those types are in the Windows build (or how to find that out for > myself). > Perhaps type 44 is the closest and is fairly generic for a > serial-line presentation of the DCF77 data? My reading of driver44.html is that the hardware decodes the DCF77 signal into a timecode string, which is not a generic "serial-line presentation" but a higher-level representation of the decoded time. The Windows port of ntpd is not currently built with support for drivers 8 or 44, but it does have support for drivers 38 and 39. To determine for yourself is not trivial but can be done following the trail of crumbs in the source code. First look at refclock_conf.c to map the driver number to a CLOCK_* preprocessor name: http://ntp.bkbits.net:8080/ntp-dev/ntpd/refclock_conf.c For driver 8, you can see near the end of the file: &refclock_parse, /* 8 REFCLK_PARSE */ and earlier in the file: #ifdef CLOCK_PARSE extern struct refclock refclock_parse; Then to see if the Windows port of ntpd includes that driver, look for CLOCK_PARSE in ports/winnt/include/config.h: http://ntp.bkbits.net:8080/ntp-dev/ports/winnt/include/config.h It's not there, so there is at least a little work to be done to enable it in the port. It would be great to enable it, and would be easiest if the developer doing so had a refclock that uses it to test against. A tip for anyone attempting to enable another driver in the Windows port of ntpd: It would be nice if all you needed to do was define the appropriate CLOCK_* in config.h, but some drivers are doubly-disabled in the port, thanks to their source files being marked as "excluded" in the IDE project settings. This redundant disabling should be removed, but it involves not only making the changes in the IDE, but then propagating the changes manually to the project files for three other Visual C++ IDE versions. Cheers, Dave Hart _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions