HMI project by your own play design, you can download the official website of the DEMO reference https://www.stoneitech.com/support/demo/ , which has the code and GUI, serial port connection only need to use your TX, RX, GND, three ports and screen connection can be, if you buy the C series screen can be put 5V port is also shared to TFT test use, change the boot icon is changed by way of U disk upgrade.