XCSoar With LNAV?

Max and XCSoar Team

For the old Cambridge LNAV to achieve full functionality (i.e. automatic final glide calculation) it needs following sentences:
GPRMB standard NMEA sentence with Waypoint/GoTo info
GPRMC standard NMEA sentence with current location info
PCAIB Cambridge proprietary sentence with waypoint elevation info.

The format of the PCAIB sentence is:
$PCAIB,1,2,CRLF
1 Destination Navpoint elevation in meters, format XXXXX (leading zeros will be transmitted)
2 Destination Navpoint attribute word, format XXXXX (leading zeros will be
transmitted)

Normally these 3 sentences are provided to the LNAV from the GPSNAV/303 combination.

So, the questions a
Can XCSoar output these 3 sentences on a serial interface at 4800 Baud ?
Does that need to be a separate COM port or can this be output on the same COM port, where the input is used e.g for PowerFlarm data (GPS, Flarm and pressure data).

I am using an IPAQ310, which has only 1 wired external port, currently connected to PowerFlarm.
Personally I don't care about other data exchange with the LNAV, e.g. for sync of McCready setting.

Sorry guys. Forget about the second question.
That was a momentary lapse of reason on my side.
Of course as a standard you cannot have 19k2 Baud Rx and 4k8 Baud Tx on the same serial interface.
But the fact remains that the LNAV needs 4k8 Baud.

In my case, with the IPAQ310, that would only leave the BlueTooth interface, as the hardwired interface is already used for the PowerFlarm.
This would require a KT6BT interface (at US$200) or similar.
As Max says on this webpages: far too expensive for my taste. (http://max.kellermann.name/blog/k6_b...ls_vfbt_1.html)

3U

On Saturday, March 16, 2013 6:27:31 AM UTC+1, wrote:
Max and XCSoar Team
[...]
Normally these 3 sentences are provided to the LNAV from the GPSNAV/303 combination.

So the L-Nav does not transmit NMEA, it expects to receive them?

We need to do something similar for the LXNAV V7 to get full feature support, the last tiny piece that is missing in XCSoar.

Yes, we could do that. Is there a ticket already? If not, please write one. And be ready to test our binaries. None of us has a L-Nav.
Maybe somebody out there has a spare one and likes to donate it to the XCSoar project? That is usually the best way to guarantee maximum compatibility.

At 08:04 16 March 2013, Max Kellermann wrote:
On Saturday, March 16, 2013 6:27:31 AM UTC+1,
wrote:
Max and XCSoar Team
[...]
Normally these 3 sentences are provided to the LNAV from
the GPSNAV/303
combination.

So the L-Nav does not transmit NMEA, it expects to receive
them?

We need to do something similar for the LXNAV V7 to get full
feature
support, the last tiny piece that is missing in XCSoar.

Yes, we could do that. Is there a ticket already? If not, please
write one.
And be ready to test our binaries. None of us has a L-Nav.
Maybe somebody out there has a spare one and likes to donate
it to the
XCSoar project? That is usually the best way to guarantee
maximum
compatibility.


We use GPS-NAV devices in combination with LX160. GPS-NAV
sends information also about the target, so with that LX160 can
be used as a final glide computer. At the moment we have made
the cabling so, that GPS-NAV sends NMEA to the RX of the
LX160, and TX of the LX160 send data to XCSoat over
Soartronic IOIO.

If we have a possibility to send NMEA data with GPS position and
target to devices like LX160 and VW921, they could use it for
their final glide calculation, build-in wind calculation, etc. Both
LX160 and VW921 can only send data to XCSoar, the receiving
side of the serial comm is used to listen external GPS source, like
GPS-NAV. Since the baudrate is same, should be relatively easy.
Maybe the NMEA our does that already, but cannot be
configured to send into the same port that is used for incoming
data.

Downloading logger data from GPS-NAV would be great! It is
really nice back-up logger with navigating display.

At 08:04 16 March 2013, Max Kellermann wrote:
On Saturday, March 16, 2013 6:27:31 AM UTC+1,
wrote:
Max and XCSoar Team
[...]
Normally these 3 sentences are provided to the LNAV from
the GPSNAV/303
combination.

So the L-Nav does not transmit NMEA, it expects to receive
them?

We need to do something similar for the LXNAV V7 to get full
feature
support, the last tiny piece that is missing in XCSoar.

Yes, we could do that. Is there a ticket already? If not, please
write one.
And be ready to test our binaries. None of us has a L-Nav.
Maybe somebody out there has a spare one and likes to donate
it to the
XCSoar project? That is usually the best way to guarantee
maximum
compatibility.


We use GPS-NAV devices in combination with LX160. GPS-NAV
sends information also about the target, so with that LX160 can
be used as a final glide computer. At the moment we have made
the cabling so, that GPS-NAV sends NMEA to the RX of the
LX160, and TX of the LX160 send data to XCSoat over
Soartronic IOIO.

If we have a possibility to send NMEA data with GPS position and
target to devices like LX160 and VW921, they could use it for
their final glide calculation, build-in wind calculation, etc. Both
LX160 and VW921 can only send data to XCSoar, the receiving
side of the serial comm is used to listen external GPS source, like
GPS-NAV. Since the baudrate is same, should be relatively easy.
Maybe the NMEA our does that already, but cannot be
configured to send into the same port that is used for incoming
data.

Downloading logger data from GPS-NAV would be great! It is
really nice back-up logger with navigating display.