Split of serial data

Projects Programming
1

Hi I am capturing the serial data from LiDAR, i want to split the data in multiple string on the basis of count. For example i receiving continuous data, i want to split it into 3 array, initial 400 sample in array-1, then next 400 in array-2 and last 400 sample array-3, then again next 400 sample in array-1 and so on..

how i can do that?

2

This really sounds like an XY problem. Why do you want to do that? Why three separate arrays?

3

What does the stream of data look like?

Use three 'for' loops?

  for (int i=0; i<400; i++)
  {
    array_1[i] = getSample();
  }

  for (int i=0; i<400; i++)
  {
    array_2[i] = getSample();
  }

  for (int i=0; i<400; i++)
  {
    array_3[i] = getSample();
  }
4

Another interesting question, have you yet written code to put the data in one array? If so, can you please post it?

5

...or two nested loops:

  for (int j=0; j<3; j++) 
    for (int i=0; i<400; i++) 
      array[j][i] = getSample();
6

But OP wants 3 arrays not one.
Johnwasser example fits in that logic.

for (unsigned short i=0; i<400; array_1[i++]=getSample);

for (unsigned short i=0; i<400; array_2[i++]=getSample);

for (unsigned short i=0; i<400; array_3[i++]=getSample);
7

You're right, but it's not "one" array, it's a matrix. Also known as "array of arrays".. :wink:
With it OP might learn how to make parametric programs and avoid duplicates of identical objects (as a good programming practice). But if one likes spagetti coding, I'm ok with that.

8

I couldnt miss your two dimensional linear array.
But 2 separate arrays and one “2 dimensional“ array are not the same.

Just look at addresses of 2 dimensional array elements and you will see its 1 array with continuous addresses.

Only in high level its 2 dimension.

May be for some unknown reason OP wants them to be separated.

Have no idea why he wants 3 separate arrays. It could be done in many ways with matrix that u showed also in 1 array with delimiter after 400 chars, with mallocing and reallocing to have more dynamic array etc.

9

Hasn't been back since he was asked, so a lot of help is being wasted on both sides of an unnecessary discussion.

10

Generally speaking, yes. But IMHO 2 (or "n") arrays with fixed size and exactly the same size and data type are better stored in a matrix container. It also helps keeping the code parametric (if you need a fourth array you just change highest index). If needed, you could also have some constant symbols to distinguish between the arrays. I won't even mention memory allocation issues (I agree with your latest sentence) as OP doesn't need it.

PS: Anyway, every programmer has his own philosophy and programming mental scheme, so there's no point in trying to convince anyone else (except for other considerations like algorithm/processing speed, code compacting, source readability, and so on...) :wink:

Sometimes is a useful thing to better explain some programming techniques/philosophy if a small debate comes out, not for OP only but for future readers. But I agree it shouldn't go on for more than necessary, so I'll cut it down here.

11

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