checkUblox VS getPVT

[Sepmai84]

Hi! Could you tell me what the difference is between the following operations?

The two programs start similarly, both with this:

#include <SparkFun_u-blox_GNSS_Arduino_Library.h>
SFE_UBLOX_GNSS myGNSS;
void setup() {
    Serial1.begin(9600);
    myGNSS.begin(Serial1);
    myGNSS.setAutoPVT(true); 
    myGNSS.setNavigationFrequency(10); // 10 Hz
}

In the first case, I just use myGNSS.checkUblox();

void loop() {
    myGNSS.checkUblox(); 
    if (myGNSS.getFixType() > 2) {
        float lat = myGNSS.getLatitude() 
        float lon = myGNSS.getLongitude() 
       }
}

In the second example, I add myGNSS.getPVT()

void loop() {
    myGNSS.checkUblox(); 
    if ((myGNSS.getPVT())&(myGNSS.getFixType() > 2)) {
        float lat = myGNSS.getLatitude() 
        float lon = myGNSS.getLongitude()
       }
}

Is there any difference between the two versions? Which one should be used, or perhaps supplemented?

[PaulZC]

Hi @Sepmai84 ,

Please see this example:

https://github.com/sparkfun/SparkFun_u-blox_GNSS_Arduino_Library/blob/main/examples/Example13_PVT/Example3_AutoPVTviaUart/Example3_AutoPVTviaUart.ino

You do not need to call checkUblox in your loop. getPVT calls it internally.

Please be careful with your baud rate, message rates/types and navigation frequency. You will overload the UART at 9600 baud if you attempt to output the standard NMEA messages at 10Hz. If you do not need NMEA, disable it with myGNSS.setUART1Output(COM_TYPE_UBX);

Best wishes,
Paul