release

Required Hardware

To run this example, you need:

Hardware Connection

Connect the pins on the UBlox Neo-6M GPS module to the pins on your USB to UART module. The connections are:

Connect the GPS antenna to the GPS module. Connect the USB to UART module to the host computer with a USB cable. GPS Fix can be easily acquired in locations that have a clear view of the sky. Wait for the GPS module to acquire satellite signals (Fix). This can be verified by checking the Fix LED (D1) of your GPS module.

Create GPS Object

Create a gpsdev object for the GPS receiver connected to a specific port. Specify the output format of the data as a timetable.

gps = gpsdev('COM4','OutputFormat',"timetable")

gps = 
  gpsdev with properties:

                         SerialPort: COM4	
                           BaudRate: 9600 (bits/s)

                     SamplesPerRead: 1	 
                           ReadMode: "latest"	 
                        SamplesRead: 0	 
Show all properties all functions

Read the GPS Data

Read the GPS data and return them as a timetable.

[tt,overruns] = read(gps)

tt=1×5 timetable
    22-Mar-2021 15:31:15.190    17.4701,78.3434,449.6000    0.2562    NaN    9.3100,1.4800,9.1900    22-Mar-2021 10:01:14.000

overruns = 
0

Display number of samples read and the samples available in the host buffer.

gps.SamplesRead

ans = 
1

gps.SamplesAvailable

ans = 
0

Release the GPS object to configure the non tunable properties. The release function also clears the buffer and resets the SamplesRead and SamplesAvailable properties.

release(gps)

Specify the number of samples per read to 2. Read the GPS data.

gps.SamplesPerRead = 2;
read(gps)

ans=2×5 timetable
    22-Mar-2021 15:31:17.178    17.4701,78.3434,450    0.0638    NaN    9.3200,1.4800,9.2000    22-Mar-2021 10:01:16.000
    22-Mar-2021 15:31:17.178    17.4701,78.3434,450    0.0638    NaN    9.3200,1.4800,9.2000    22-Mar-2021 10:01:16.000

Display number of samples read and the samples available in the host buffer.

gps.SamplesRead

ans = 
1

gps.SamplesAvailable

ans = 
0

Clean Up

When the connection is no longer needed, clear the associated object.

delete(gps);
clear gps;