On Fri, 2007-05-18 at 07:26 -0700, anthonysakr wrote:
> this is what i could come up with by myself, i don't know if it's right but
> please send any help you could think of.
> my gps sends the following message every 2sec
> $GPRMC,141832,A,3352.401,N,03531.500,E,005.1.277.7.310301,003.3,E*79 (with
> different numbers each time of course)
> $GPRMB,A,............V*71
> ...
> i'm interested in only these lines, to be more specific i just want to save
> the time, long, lat and speed, now from what i could understand the string
> is devided into the following:
> $GPRMC,"time"(6bytes),A,"long"(8bytes),N,"lat"(9bytes),E,005.1.2.......
> $GPRMB,A,......"speed"(6bytes)V*71
> what i'm thinking of doing is the check for the C character (ASCII) wich
> comes in GPRMC and is only present there in all the gps string wich signals
> the start of the frame then read 86 bytes after the C character (from the
> first , till the 1 in 71) save them then sort them in some sort of table or
> buffer where i take only the bytes of the time, long, lat and speed before
> transmitting them to the ram(24LC64) via the I2C bus.
> 
> if someone is intrested or has such a program please reply because i've been
> stuck on this part for quite some time, i've given it a try but i'm still
> learning to program pic as i go so i'm 90% sure my program is wrong :s but
> i'll be posting some of it soon.

My carmon display project does this sort of thing, however it's in C,
which is why I didn't respond before, however perhaps it might serve
some use, even if you aren't familiar with the language:

http://repatch.dyndns.org:8383/pic_stuff/carmondi

TTYL

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