LVGL

[中文]

A varity of lvgl demo projects are provided on BK7258 to demonstrate the functions of different typed and scenarios. Details are shown in the table below.

Project name	LCD resolution	Data format	Project description
86box	480*480	RGB565	86box demo
86box_smart_panel	480*480	RGB565	86box demo with speech recognition
benchmark	480*480	RGB565	LVGL performancescores demo
camera	480*854	RGB565	LVGL and camera image switching demo
keypad_encoder	800*480	RGB565	LVGL official demo
meter	400*400	RGB565	QSPI LCD animation demo
meter_rgb_16M	720*1280	RGB888	RGB888 LCD animation demo
music	720*1280	RGB565	LVGL official demo
stress	800*480	RGB565	LVGL official demo
widgets	1024*600	RGB565	LVGL official demo

The compilation command of the above demo project is make bk7258 PROJECT=lvgl/xxx. After the compilation and download is completed, it will be executed by default after power on.

Except for the LCD used in the camera project and meter project, which does not include touch function, the rest of the projects have turned on touch function. In addition, in addition to the normal LVGL UI display, the 86box project, 86box_smart_panel project and camera project also show another other different function. After powering on, the display need to be tested according to the following.

• 86box

  The 86box project shows how to turn off the LCD display and LVGL drawing. You can enter the command 86box to test the shutdown.

• 86box_smart_panel

  The 86box_smart_panel project demonstrates the voice recognition function. The voice commands must be issued in Chinese. They are a er mi nuo hui ke mo shi yong can mo shi li kai mo shi. First, you need to issue the a er mi nuo wake-up word to jump to the demo page befor you can continue to issue other wake-up words for testing.

• camera

  The camera project shows the switching display of camera image and lvgl image. The specific test method is as follow.

• Install the IoT software on your mobile phone. After instation, click on the software to go to the main page.

• Use the IoT software to click on the upper right corner to add the BK7258_DL_04 device and click on start adding. Then click Select Wi-Fi to connect to a network that can connect to the Internet and click next.

• Select your own Bluetooth device, which can be viewed in the power-on log or enter the mac command to view the MAC address of the device. Click and wait for the device’s network connection progress to reach 100%.

• The phone automatically jump to the camera preview page. You can send the lvcam_open command to display the camera image on the LCD screen and send the lvcam_close command to display the LVGL image on the LCD. Continuously switch the display in sequence.

Note

The camera resolution used in the camera project is 864x480. In addition, this project can also be tested without using mobile Iot software. You can directly enter the media uvc open 864X480 command to open the camera, and then enter the corresponding switching command.