[time-nuts] Time Code generator

jimlux jimlux at earthlink.net
Sat Dec 4 00:07:42 UTC 2010


Chris Albertson wrote:
> On Fri, Dec 3, 2010 at 12:54 PM, jimlux <jimlux at earthlink.net> wrote:
>> Jeroen Bastemeijer - EWI wrote:
> 
>>> A PIC based IRIG timecode generator sounds very interesting! Would like to
>>> build a new stand-alone IRIG-timecode generator since my Brandywine died....
> 
> I just read the source code for the irig generator that is included with NTP.
> The code is not really all that complex but there are a number a cases to
> handles, for "leap warnings" and such.  The code handles not only irig but
> also wwv/h simulation so yu could cut out half of the lines for irig only
> 
> Of course you can't use this C code on a PIC but the algoritm is there for
> you to copy.  And if yu are reading this list there is agood chance it's
> alrady on your computer
> 
> But to build a PIC based IRIG generator you need a way to get the
> absolute time of day into the PIC, the periodic interrupt can drive it
> after that point and y'd get that from deviding down a frequency
> reference
> 


I can think of a couple ways to do it..
One, if you have a IRIG reader, is to just have buttons to push to step 
up and down, and left and right.
I think I'd go with some sort of serial port interface, though.  Maybe 
you could do something takes a NMEA sentence?



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