Array and ASCII

[Seahound1]

There is very little in terms of documentation (remzibi 3DR)....but there is a GPS simulator (happykillmore.com) incorporated into the config software which generates standard NMEA GPS sentences, for example

$GPGGA,000000,4124.8963,N,08151.6838,W,1,05,1.5,28 0.2,M,-34.0,M,,,*59
$GPRMC,000000,A,4916.45,N,12311.12,W,000.5,253.7,1 91194,020.3,E*68

[SteveB]

There is very little in terms of documentation (remzibi 3DR)....but there is a GPS simulator (happykillmore.com) incorporated into the config software which generates standard NMEA GPS sentences, for example

$GPGGA,000000,4124.8963,N,08151.6838,W,1,05,1.5,28 0.2,M,-34.0,M,,,*59
$GPRMC,000000,A,4916.45,N,12311.12,W,000.5,253.7,191194,020.3,E*68

Looking it over quickly, this is the value you are looking for, and likely what the remzibi 3DR calls "heading". (It would actually be true course if provided by a GPS). The important issue is the format. It looks like a string 5 characters long is required.

So let's say you have a WORD variable MyHeading that contains a value between 0-359. To output this as it appears in the NMEA sentence use:
SEROUT bob, baud, [DEC3 MyHeading , ".0"]

You can see I added the decimal point and zero to fill out the five characters.

HTH

[Seahound1]

Yes you are right.....sorry I maybe didn't make it very clear. The protocol for the OSD is that it must see the other characters in the array (as per below) for it even to respond. According to the firmware notes is must see the preample ($GPRMC for example) from this I guess it gets how many commas to expect so that it knows it has the whole NMEA sentence. That is why I was forced to use the array in the first place. For example I just tried SEROUT2 ("$GPRMC, 00000, etc, etc,")..... is says it has a GPS connection but then stops. Using the array it confirms GPS connection and then goes on to dispay the OSD. So I thought I could fool it into showing the heading using the two methods below....but OH NO...Is there a way to send the first part of an array and then the remainder......if I could that at least I could try using the normal method you mention below.

[SteveB]

How about this:

RMC_array[48]=","
RMC_array[49]= Heading DIG 2 + "0"
RMC_array[50]= Heading DIG 1 + "0"
RMC_array[51]= Heading DIG 0 + "0"
RMC_array[52]= "."
RMC_array[53]= "0"
RMC_array[54]=","

[Seahound1]

Let me give it a whirl and see.....

Just tried it and it doesn't work...but great idea though...thanks

[Seahound1]

I tried to use other modifiers as well...but then saw they can only be used in the send statement ...Serout2 ( #heading) which converts the heading into a set of ASCII characters. Tried this combination too


WPT_array[47]=Dec_off Dig 0+"0"
WPT_array[48]=","
WPT_array[49]= #course1
WPT_array[50]= Hex2 course2
WPT_array[51]= Hex course3
WPT_array[52]="."

But it won't compile....

[SteveB]

Have you tried to send some test strings? something like:

SEROUT2 bob, baud, ["$GPRMC,220516,A,5133.82,N,00042.24,W,173.8,231.8,1 30694,004.2,W*70"]



If that works, try this (assuming Heading is the variable that contians your heading data):

SEROUT2 bob, baud, ["$GPRMC,220516,A,5133.82,N,00042.24,W,173.8,",DEC3 Heading,".0,130694,004.2,W*70"]