Thanks Alan,

I had found that after posting and am busy digesting it.
I think I see now how they convert to UNIX Time and handle the Leap Year,
now I need to try and work it back words,  add in the BCD conversions and
take out the DST portion (we work only with UST/GMT for time stamps).

I also note my error in the Epoch being 1979 I see now it is 1970 did I
confuse it with the GPS Time?
With all the software based clocks I have written over the years, always in
BCD, this is the first time I have tried to interact with networks. I
didn't realise there were so many conflicting time formats out there.

Cheers
Chris


On 17 February 2012 11:30, <alan.b.pearce@stfc.ac.uk> wrote:

> > HI,
> >
> > I have the RTCC on my PIC32  running and all is well but I need to
> convert from
> > POSIX to BCD to set the RTCC and from BDC to POSIX to TimeStamp out
> bound data
> > packets. As this would be a frequent requirement for most systems that
> are
> > communicating with networked devices I was surprised that PLIB has no
> functions to
> > convert between POSIX TIME format and BCD.
> >
> > Have I overlooked something (I often do with Microchip Documentation) o=
r
> has any one
> > else created such functions and willing to share?
> >
> > I am not a LINIX or PC person so have never worked with POSIX TIME
> format. From what
> > I can find in Google it is a 64Bit Int that counts seconds from midnigh=
t
> on the 1st
> > Jan 1979. The PIC32 RTCC counts from 1st Jan 2000, so I need to add or
> subtract an
> > offset in seconds and do the BCD conversions, But how are leap years
> catered for in
> > that calculation?
> >
> > If no one has code for this I would really appreciate some pointers to
> help me
> > create the functions.
>
> Microchip came out with an app note recently on converting between their
> RTC chip and Linux time.
>
> Look at http://ww1.microchip.com/downloads/en/AppNotes/01412A.pdf for
> further info.
>
>
> --
> Scanned by iCritical.
>
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.