移植lvgl到板子之后可以先运行lvgl内置的示例j检查移植效果，这些示例在lv_conf.h中可以找到，v8.3版本为例：
/*===================
* DEMO USAGE
====================*/
/*Show some widget. It might be required to increase `LV_MEM_SIZE` */
#define LV_USE_DEMO_WIDGETS 0
#if LV_USE_DEMO_WIDGETS
#define LV_DEMO_WIDGETS_SLIDESHOW 0
#endif
/*Demonstrate the usage of encoder and keyboard*/
#define LV_USE_DEMO_KEYPAD_AND_ENCODER 0
/*Benchmark your system*/
#define LV_USE_DEMO_BENCHMARK 0
#if LV_USE_DEMO_BENCHMARK
/*Use RGB565A8 images with 16 bit color depth instead of ARGB8565*/
#define LV_DEMO_BENCHMARK_RGB565A8 0
#endif
/*Stress test for LVGL*/
#define LV_USE_DEMO_STRESS 0
/*Music player demo*/
#define LV_USE_DEMO_MUSIC 0
#if LV_USE_DEMO_MUSIC
#define LV_DEMO_MUSIC_SQUARE 0
#define LV_DEMO_MUSIC_LANDSCAPE 0
#define LV_DEMO_MUSIC_ROUND 0
#define LV_DEMO_MUSIC_LARGE 0
#define LV_DEMO_MUSIC_AUTO_PLAY 0
#endif
这些宏定义对应的demo源码位于这个目录： lvgl/demos
那就是你的显示驱动的问题，检查下面这个成员指向的回调函数：
static lv_disp_drv_t disp_drv;
disp_drv.flush_cb = xxxx;
参考： https://gitee.com/weidongshan/lv_100ask_linux_desktop/blob/master/main.c#L35
