Arduino question?

[Bruce Labitt]

Can I ask an Arduino/C/C++ question here?  If not, where is a decent 
place to ask?  Full code is just under 50KB (unzipped).

It's a "Variable was not declared in this scope" problem. Basically, I'm 
in over my head at the moment.  I'm not a good structured programmer - 
so let's get that out of the way.  I'm a hack, in the worst sense...

Everything was working... when I had a huge file.  I then decided, wow, 
this is a mess, lets break this up a bit into modules, so that it is 
more supportable and debug-able (for myself).  If anyone is remotely 
interested, it is a homebrew radar based chronograph.  I've got most of 
the pieces working (or at least it worked before I recently busted 
things).  The 100KHz sampling using DMA, the ping pong floating point 1K 
FFT's running in 'real' time, and some display stuff.  Separately, I 
have a live update of a tft screen (320x240) running with the FFT 
output.  I'm running on an ARM M4F processor, but using the Arduino 
IDE.  The Arduino way of doing things is a little confusing to me, to be 
honest.  It hides a lot of things.

Ok, here is the error.

/home/bruce/Arduino/adcdmafftM4bruce/adcdmafft/adcdmafftm4/moreutils.ino: 
In function 'void doMedian(float*, float*, int)':
moreutils:14:3: error: 'RunningMedian' was not declared in this scope
    RunningMedian samples = RunningMedian(medianlength);
    ^
moreutils:14:17: error: expected ';' before 'samples'
    RunningMedian samples = RunningMedian(medianlength);
                  ^
moreutils:16:5: error: 'samples' was not declared in this scope
      samples.add(abuf[i]);
      ^
exit status 1
'RunningMedian' was not declared in this scope

The code in moreutils.ino is:

// additional processing
#include "moreutils.h"

void doMedian( float abuf[], float runmed[], int medianlength) {  // 
needs work!

   RunningMedian samples = RunningMedian(medianlength);
   for (int i=0; i< FFT_SIZE/2; i++) {
     samples.add(abuf[i]);
     if (i>medianlength-1) {
       runmed[i-medianlength] = samples.getMedian();
       // don't put value until the circ buffer is filled
     }
   }
   for (int i= (FFT_SIZE/2 -medianlength-7); i< (FFT_SIZE/2); i++) {
     runmed[i] = runmed[FFT_SIZE/4];  // hack for now
     // at tail end of median there are some bizarre numbers.  root 
cause has not been
     // determined, so we just fill the last samples from 'something close'
   }
}

Inside of moreutils.h, is #include RunningMedian.h with an 
#ifndef/#define/#include statement, to prevent multiple includes of the 
same file (RunningMedian.h).

I'm really kind of confused as to where I need to do the declaration.

In 
https://github.com/RobTillaart/Arduino/blob/master/libraries/RunningMedian/examples/RunningMedian/RunningMedian.ino 
the declaration is simply done prior to setup.  Snippet below

#include <RunningMedian.h>

RunningMedian samples = RunningMedian(5);

RunningMedian samples2 = RunningMedian(9);

void setup() {

...

}

void loop() {

use samples here...

}

I'm sure this is trivial for most of you - but I'm both perplexed and 
stuck.  If one of you kind souls could help me, I'd greatly appreciate 
it.  I'd even travel to see someone if that would work out better.

TIA, Bruce