Running Demo Code

Locate to the directory where the test code, uart_gps_demo.py, exists:

Execute the following command to get the directory where VisionFive.gpio exists:
```
pip show VisionFive.gpio
```
Result:
```
Location: /usr/local/lib64/python3.9/site-packages
```
Note:
The actual output depends on how the application is installed.
Execute the following to enter the directory, for example, /usr/local/lib64/python3.9/site-packages as indicated in the previous step output:
```
cd /usr/local/lib64/python3.9/site-packages
```
Execute the following command to enter the sample-code directory:
```
cd ./VisionFive/sample-code/
```

Execute the following command on your terminal before executing the demo code:

sudo systemctl stop serial-getty@ttyS0.service

Under the sample-code directory, execute the following command to run the demo code:

sudo python uart_gps_demo.py

Alternatively, you can execute the following command:

sudo python3 uart_gps_demo.py

Result:

If the GPS signal is weak, the terminal output is as the following:

*****The GGA info is as follows: *****
 msg_id: $GPGGA
 NorS:
 EorW:
 pos_indi: 0
 total_Satellite: 00

!!!!!!Positioning is invalid!!!!!!

If the GPS signal is strong, the terminal output is as the following after a few seconds:

*****The GGA info is as follows: *****
 msg_id: $GPGGA
 utc time: 2:54:47.0
 utc time: 025447.00 (format: hhmmss.sss)
 latitude: 30 degree 33.29251 minute
 latitude: 3033.29251 (format: dddmm.mmmmm)
 NorS: N
 longitude: 104 degree 3.45523 minute
 longitude: 10403.45523 (format: dddmm.mmmmm)
 EorW: E
 pos_indi: 1
 total_Satellite: 08

*****The positioning type is 3D *****
The Satellite ID of channel {} : {}
                           ch1 : 14
                           ch2 : 01
                           ch3 : 03
                           ch4 : 06
                           ch5 : 30
                           ch6 : 21
                           ch7 : 19
                           ch8 : 17