DevHeads IoT Integration Server•4mo ago

Why is my Zynq-7000 marine navigation system failing to initialize the NMEA 2000 GPS sensor?

I am developing a marine navigation system using a Zynq-7000 with Embedded Linux. The system should read data from an NMEA 2000 GPS sensor. I have confirmed the serial port connection and settings, checked the GPS sensor configuration and data format, made sure the NMEA 2000 library is correctly installed and configured. But i am getting the error Failed to initialize NMEA 2000

#include <stdio.h>
#include <nmea2000.h>

int main() {
    NMEA2000 *nmea;
    nmea = nmea2000_init("/dev/ttyUSB0");

    if (nmea == NULL) {
        fprintf(stderr, "Failed to initialize NMEA 2000\n");
        return 1;
    }

    float latitude, longitude;
    if (nmea2000_get_gps(nmea, &latitude, &longitude) != 0) {
        fprintf(stderr, "Failed to read GPS data\n");
    } else {
        printf("Latitude: %f, Longitude: %f\n", latitude, longitude);
    }

    nmea2000_cleanup(nmea);
    return 0;
}

#include <stdio.h>
#include <nmea2000.h>

int main() {
    NMEA2000 *nmea;
    nmea = nmea2000_init("/dev/ttyUSB0");

    if (nmea == NULL) {
        fprintf(stderr, "Failed to initialize NMEA 2000\n");
        return 1;
    }

    float latitude, longitude;
    if (nmea2000_get_gps(nmea, &latitude, &longitude) != 0) {
        fprintf(stderr, "Failed to read GPS data\n");
    } else {
        printf("Latitude: %f, Longitude: %f\n", latitude, longitude);
    }

    nmea2000_cleanup(nmea);
    return 0;
}

@Middleware & OS

Solution:

Thanks for the idea, due to ur questions I was able to make research and get the list of possible errors, it turns out in my case it was necessary permissions not being granted to access serial device I used sudo and it worked just fine

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7 Replies

ZacckOsiemo•4mo ago

So why is nmea2000_init returning a null?

Boss lady•4mo ago

Not sure exactly at first I thought I imputed a wrong path but I have doubled checked and the path is okay

ZacckOsiemo•4mo ago

Ok maybe I didn't ask the right way, what things would cause it to return null the exhaustive list?

Boss lady•4mo ago

@ZacckOsiemo Ummm, libraries failing due to internal errors, the serial port configuration not matching, issues with the usb to tge serial adapter, application not having necessary permissions to access serial device

ZacckOsiemo•4mo ago

yes so you need to list those errors and find out which one is occuring, if you habve this list you should not be stuck.

Solution

Boss lady•4mo ago

ZacckOsiemo•4mo ago

@Boss lady sometimes learning how to fish is better than getting the fish. I doubt those kinds of errors will be an issue for you much longer. Proud that you came to that conclusion.

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Why is my Zynq-7000 marine navigation system failing to initialize the NMEA 2000 GPS sensor?