Debugging UART Send and Receive Functions

Configure Visionfive minicom:
```
sudo minicom -s
```
Select Serial port setup, and configure minicom as follows:

Figure 1. Example Configuration
Start VisionFive minicom by typing the following command on the PC:
```
minicom -o -D /dev/ttyS2
```
Figure 2. Example Output
Configure Ubuntu minicom by typing the following:
```
sudo minicom -s
```
Select Serial port setup, and configure minicom as follows:

Figure 3. Example Configuration

Note:
Serial Device can be detected by command dmesg | grep tty on Ubuntu

Figure 4. Example Command and Output
Start Ubuntu minicom, you can see as follows:

Figure 5. Example Output

Test UART Send:

To test UART send function, you can input characters, such as hello ubuntu, on the VisionFive minicom. Then you will see the character are outputted on the Ubuntu minicom as the following:
Figure 6. Test UART Send
- Figure on the Left: Ubuntu minicom interface
- Figure on the Right: VisionFive minicom interface

Test UART Receive:

To test UART receive, you can input characters, such as hello visionfive on the Ubuntu minicom. Then you will see the characters are outputted on the VisionFive minicom:
Figure 7. Test UART Receive:
- Figure on the Left: Ubuntu minicom interface
- Figure on the Right: VisionFive minicom interface