Peripheral Examples

This topic provides examples of using the 40-pin GPIO header to connect to external peripherals.

Run Sense HAT (B) SHTC3 Sensor

This example connects Sense HAT (B) to VisionFive 2 and runs the SHTC3 sensor test program.

Note: The official libraries of BCM2835, Python, and wiringPi are not supported. Use the system call is instead.

Connect Sense HAT to the 40-pin header of VisionFive 2 as follows.

Figure 1. Connect Sense Hat (B) to the 40-Pin Header


Sense HAT (B)	VisionFive 2 Pin Number
3V3	1
GND	9
SDA	3
SCL	5

Download the source code from
(Skip if you already install the compile tool) Install the compile tool. For example:
```
sudo apt-get install gcc-riscv64-linux-gnu
```
Execute the following to compile:
```
riscv64-linux-gnu-gcc SHTC3_dev.c -o shtc3
```
It generates the shtc3 file in the same directory.
Copy the executable code from the shtc3 file to the board, and change the execution permission by executing the following command:
```
chmod +x shtc3
```

Run the SHTC3 sensor.

./shtc3

The output like the following indicates the execution is successful.


root@starfive:~# ./shtc3 

SHTC3 Sensor Test Program ...
Fopen : /dev/i2c-0
Temperature =  52.20°C , Humidity =  55.32% 
Temperature =  23.81°C , Humidity =  55.29% 
Temperature =  23.79°C , Humidity =  55.30% 
Temperature =  23.82°C , Humidity =  55.29% 
Temperature =  23.81°C , Humidity =  55.29% 
Temperature =  23.82°C , Humidity =  55.30%

Run 2.4inch LCD Module

This example connect the 2.4inch LCD Module to VisionFive 2 and demos how pictures are displayed.

Connect the 2.4inch LCD module with the 40-pin header of VisionFive 2.

Figure 2. Connect 2.4inch LCD with 40-Pin Header


2.4inch LCD Module	VisionFive 2 Pin Number
VCC	17
GND	39
DIN	19
CLK	23
CS	24
DC	40
RST	11
BL	18

Download the source code from
Execute the following command to copy the code to the board.
```
tar -xvf LCD_Demo.tar.gz
cd visionfive2/
./main 2.4
```
The following two figures will be displayed in turn. One is the photo of VisionFive 2 and the other is the official example figure.
Figure 3. Example Output