GPS Debugging Demo

1 Demo overview

This demo shows how to test the GPS positioning-information feature.

2 Connecting the GPS to the board

As shown in the figure, the GPS can be connected to the board's TTL interface, i.e. UART4.

GPS_1

3 Procedure

Open a terminal and copy the executable smdt_gps_demo from this demo's bin directory (05-Development Materials\Software Development Materials\linux_demo\smdt_gps_demo\bin) to the board's filesystem (the source code is available under the src path).

In the terminal, run the following commands to switch to the directory containing the smdt_gps_demo executable.

#切换到 smdt_gps_demo 可执行程序所在目录
cd ‘可执行文件所在目录’

#查看 smdt_gps_demo 是否在该目录下
ls

If the executable smdt_gps_demo is in the current directory, change its permissions.

#添加可执行权限
chmod +x smdt_gps_demo

#查询是否修改成功
ls -ld smdt_gps_demo

After confirming the permission change succeeded, run ./smdt_gps_demo -h to view the program's help information. The default parameters set in this test script are as follows:

  • device: /dev/ttyS4 (UART4)
  • baud: 9600 (default baud rate 9600)
#查看帮助信息
./smdt_gps_demo -h

The result is shown below:

GPS_2

Run the following command to obtain the current GPS data. If positioning succeeds, coordinates and other data are displayed. If positioning fails, a prompt is shown — please check whether the GPS antenna module is correctly receiving a positioning signal.

#GPS显示定位信息
./smdt_gps_demo -d /dev/ttyS4 -b 9600

Successful positioning displays the positioning information at 1-second intervals. The result is shown below:

GPS_3

Failed positioning shows the prompt. The result is shown below:

GPS_4

Press Ctrl+C to force-exit the program.

GPS_5