Char String to Float Array

Projects Programming
1

Hi - I have a series of comma-separated values being read from a text file (SPIFFS) and populating arrays. Here's an example of a functional code that works for Int arrays (blockWPS in this one):

/* int blockWPS[20] */

if (i == 12) { /* reading from line 12 of the txt file */
      s.toCharArray(c, 200);
      int result = sscanf(c, "%i,%i,%i,%i,%i,%i,%i,%i,%i,%i,%i,%i,%i,%i,%i,%i,%i,%i,%i,%i", &blockWPS[0], &blockWPS[1] , &blockWPS[2], &blockWPS[3], &blockWPS[4], &blockWPS[5], &blockWPS[6] , &blockWPS[7], &blockWPS[8], &blockWPS[9], &blockWPS[10], &blockWPS[11] , &blockWPS[12], &blockWPS[13], &blockWPS[14], &blockWPS[15], &blockWPS[16] , &blockWPS[17], &blockWPS[18], &blockWPS[19]);
    };

Here's an example that does not work for Float arrays (scatterArea):

    /* float scatterArea[20] */
if (i == 13) {
      s.toCharArray(c, 200);
      float result = sscanf(c, "%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f,%f", &scatterArea[0], &scatterArea[1] , &scatterArea[2], &scatterArea[3], &scatterArea[4], &scatterArea[5], &scatterArea[6] , &scatterArea[7], &scatterArea[8], &scatterArea[9], &scatterArea[10], &scatterArea[11] , &scatterArea[12], &scatterArea[13], &scatterArea[14], &scatterArea[15], &scatterArea[16] , &scatterArea[17], &scatterArea[18], &scatterArea[19]);
    };

I've used s.toFloat(); successfully for single value reads, but I'm not sure how to make it work with 20 comma separated values. I've done a bit of reading about the atof() command, still trying to think of how to apply it with these arrays though.

Any help would be great, thanks!

2

Have a look at strtok() to find each comma and then atof()

3

J-M-L:
Have a look at strtok() to find each comma and then atof()

I'm trying and failing, I'll have to go at it again in the morning when my brain function returns 8)

4

Example #5 of the serial input basics thread uses strtok() and atof() so may be of help to understand using those functions.