How do I split a char array with arduino

Question

0.00/5 (No votes)

See more:

I'll read my GPS coordinates form my Arduino as a comma seperated buffer array. the data comes in as follow:

$GPGGA,095350.000,5112.1239,N,04315.0058,E,1,7,1.13,0.3,M,47.2,

Here is my code:

arduino

#include <SoftwareSerial.h>
 
SoftwareSerial SoftSerial(4, 5);
unsigned char buffer[64];
int count = 0; 

void sendGPSData() {
    if (SoftSerial.available())
    {
        while (SoftSerial.available())
        {
            char read = SoftSerial.read();

            buffer[count++] = read;

            Serial.print(String(read));

            if (count == 64) {
                break;
            }
        }

        delay(2000);
        clearBufferArray();
        count = 0;
    }
}

void clearBufferArray()
{
    for (int i = 0; i < count; i++)
    {
        buffer[i] = NULL;
    }
}

The question I've got is how can I split the buffer array so I could get the bold parts in the output above?

What I have tried:

I've tried to use this code GPS data · GitHub[^] but there are to much resources needed.

Posted 2-Dec-16 0:42am

Hein Pauwelyn

Updated 20-Aug-17 14:17pm

Add a Solution

Comments

Richard MacCutchan 2-Dec-16 9:07am

What language is that and does it have a string tokenizer?

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

DKWatson · Answer 1 · 2017-08-20T13:32:00

I use this for my own GPS parser. I pulled it off the net or out of a book but can't remember where so I can't give proper credit to its author. You need to declare a char array to hold the GPS data which you probably already have, and then a string array, in this case msg_field[] with enough elements for each field in the char array - a field being the data between the commas. Twenty is sufficient for GPS data.

C++

byte getCSVfields()
{
    byte _sentencePos = 0;
    byte _comma_count = 0;
    msg_field[_comma_count] = "";
    while (1)
    {
        if (input_buffer[_sentencePos] == NULL) break;
        if (input_buffer[_sentencePos] == 44)
        {
            _comma_count++;
            msg_field[_comma_count] = "";
            _sentencePos++;
        }
        else
        {
            msg_field[_comma_count] += input_buffer[_sentencePos];
            _sentencePos++;
        }
    }
    return _comma_count + 1;
}

What you end up with is an array of Strings, in your case with

$GPGGA,095350.000,5112.1239,N,04315.0058,E,1,7,1.13,0.3,M,47.2

msg_field[0] = $GPGGA
msg_field[1] = 095350.000
msg_field[2] = 5112.1239
msg_field[3] = N
msg_field[4] = 04315.0058
msg_field[5] = E
msg_field[6] = 1
msg_field[7] = 7
msg_field[8] = 1.13
msg_field[9] = 0.3
msg_field[10] = M
msg_field[11] = 47.2

and the byte value returned would be 12, the number of fields. So then you would play around with fields 1 thru 5 if I see the bold correctly.

Have fun

User 59241 · Answer 2 · 2017-08-20T14:17:00

Don't reinvent the wheel. These are NMEA sentences NMEA 0183 - Wikipedia[^] and there are many libraries written for parsing them.

See here: How to use GPS with Arduino - Parse and Log NMEA Sentences - Tutorial Australia[^]

and: NMEA:: Wiring library for easy decoding of GPS data[^]

and: TinyGPS++ | Arduiniana[^]

CPallini · Answer 3 · 2016-12-02T03:12:00

Solution 1

See here: serial - How do I split an incoming string? - Arduino Stack Exchange[^].

Posted 2-Dec-16 3:12am

CPallini

How do I split a char array with arduino

3 solutions

Solution 2

Solution 3

Solution 1

Add your solution here

Preview 0