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-   -   Serial Input Buffer Size?? (http://www.go4expert.com/forums/serial-input-buffer-size-t22338/)

reppig 7Jun2010 18:48

Serial Input Buffer Size??
 
I am trying to write a program to read GPS data coming from a balloon payload and use it to point my antennas to stay with the balloon.


My problem is I wrote the program assuming the input buffer would contain a whole set of GPS NEMA sentences (GGA, GSA, RMC, etc).


But no matter what I do when I read the buffer I only get something like this:
200,W,,,130510,,*09
$GPGGA,123937.095,2831.4487,N,08041.0200,W,0,00,50 .0,10.0,M,-31.2,M,0.0,0000*41
$GPGSA,A,3,09,31,2


Which is not a buffer size of 4096 the default. So, I changed the buffer size to 16384.


When I was counting on something like this:
,2831.4615,N,08040.9801,W,0.09,108.98,130510,,*1F
$GPGGA,124025.092,2831.4615,N,08040.9801,W,1,06,1. 0,5.5,M,-31.2,M,0.0,0000*43
$GPGSA,A,3,09,31,22,24,,,,,,,,,6.2,5.4,3.0*39
$GPRMC,124033.092,A,2831.4613,N,08040.9790,W,0.08, 168.54,130510,,*1E
$GPGGA,124033.092,2831.4613,N,08040.9790,W,1,05,2. 0,2.0,M,-31.2,M,0.0,0000*47
$GPGSA,A,3,09,31,22,24,,,,,,,,,6.2,5.4,3.0*39


Can anyone tell me how I can read in more data?? or If it is not possible??


In my Main.Designer.cs file I have:
this.serialInput.BaudRate = 1200;
this.serialInput.DiscardNull = true;
this.serialInput.ReadBufferSize = 16384;


I try and read it it like this:

// Check if serial port is open
if (serialInput.IsOpen)
{
// Read buffer into a string
string inputBuffer = serialInput.ReadExisting();
... Using Microsoft Visual C# 2008 Express Edition



Thanks


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