GUI LittlevGL LVGL

LittleVGL2RTT软件包还有在维护吗，测试遇到一些问题求解

发布于 2020-11-03 14:23:07 浏览：1695 订阅该版

cheney 2020-11-06

这家伙很懒，什么也没写！

LVGL支持三种缓存的配置：
```c
    /* LVGL requires a buffer where it draws the objects. The buffer's has to be greater than 1 display row
     *
     * There are three buffering configurations:
     * 1. Create ONE buffer with some rows:
     *      LVGL will draw the display's content here and writes it to your display
     *
     * 2. Create TWO buffer with some rows:
     *      LVGL will draw the display's content to a buffer and writes it your display.
     *      You should use DMA to write the buffer's content to the display.
     *      It will enable LVGL to draw the next part of the screen to the other buffer while
     *      the data is being sent form the first buffer. It makes rendering and flushing parallel.
     *
     * 3. Create TWO screen-sized buffer:
     *      Similar to 2) but the buffer have to be screen sized. When LVGL is ready it will give the
     *      whole frame to display. This way you only need to change the frame buffer's address instead of
     *      copying the pixels.
     * */
```
参见lv_port_disp_template.c中75行后面的示例代码，你可以选用第二种方法，其可以降低对于内存的消耗。