This interests me also - I have a simple GPS device (a so-called
'training' device) which captures trackpoints and waypoints. Its
current PC software is just that, i.e. it doesn't work on a Mac, and
more or less the only thing it can do is to create a kml file for use
by Google Earth. I am not at all sure that it uses the same chipset
as the mainstream GPS devices (the kind you can pre-programme with a
route, like Garmin etc), but my main problem in even starting to deal
with it is the lack of USB capability in Rev. In order to talk to the
device, I have to have a USB driver of some kind and I absolutely do
not know where to start. I have tried emailing both the retailer and
the manufacturer for advice but neither has bothered to reply.
Has anyone got any advice about cracking the USB problem?
TIA
Graham
On Sun, 02 Mar 2008 12:42:43 +0000, Ben Rubinstein
<[EMAIL PROTECTED]> wrote:
On 1/3/08 22:59, R. Hillen wrote:
is there anybody who succeeded in reading data from a gps device
into a
revolution application?
How did you do it? Which device did you use?
Hi Richard,
I did this a couple of years ago in Rev - it was very
straightforward. All
(er, virtually all) GPS devices speak NMEA, which is widely
documented on the
web. We worked with a couple of different devices, and the
software didn't
notice any difference (apart from anything else, I think pretty
much everyone
is using the same chipsets).
We did this on Mac and Windows; the only difficulty was locating
Mac drivers.
All the devices we worked with were serial originally with serial-
USB chips
bolted on; there seemed to be a couple of different ones of these.
The other
way that working on Windows was easier in locating the device
automatically -
just iterated through COM1-10; on the Mac I think we had to set the
name of
the device in the configuration.
The devices just spend a steady stream of data; in the NMEA format
this is
ASCII, line formatted; so I had a handler running on a timer which
read data
from the port and buffered it, and then invoked a handler to see
whether there
were any completed "sentences" to process.
That handler in turn checked whether the position etc information
had changed,
and if so invoked a handler to actually do whatever it was supposed
to be.
In theory you can switch the devices into a binary format which
should be much
faster - but we didn't seem to need the speed and I never dared try
in case I
couldn't get it to switch back!
Good luck,
- Ben
----------------------------------------
Graham Samuel / The Living Fossil Co. / UK and France
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