Re: [gpsd-users] GPSCTL do more than you ask him to do.

[Eric S. Raymond]

Gary E. Miller <address@hidden>:
> Yo Eric!
> 
> On Thu, 15 Oct 2015 17:09:39 -0400
> "Eric S. Raymond" <address@hidden> wrote:
> 
> > >Everytime I started to look at gpsctl I choked.  
> > 
> > Why, in particular?
> 
> Hard to say what I don't understand about a subject I don't understand.  :-)
> 
> I would like a simple function, dependent on GPS type, that I could pass
> a simple control string and it would do the checksum/framing/etc. and send
> the string.  No more.
> 
> So I could code something like:
> 
>       gpsctl -t u-blox --set-pps-width 100
> 
> Then in main() maybe call that calls a function like:
>       set_pps_width( 'u-blox', 100)
> 
> That would know the string to send to some GPS types, hopefully u-blox,
> to set the PPS width to 100 mSec.
> 
> send_pps_width() would call a function like:
>       send_ublox( 'XXYYZZ' );
> 
> send_ublox() would know how to checksum and frame XXYYZZ and sent to the 
> GPS.
> 
> For some GPS, like garmin serial, a wait for ACK would also be needed, so
> some primitive scheduler.
> 
> But not high on my TODo list.

The machinery for this already exists.  Look at how the -x option is 
implemented.
-- 
                <a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>

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