linux设备下lvgl 直接引用png图片

1.lv_conf.h文件配置

/*API for open, read, etc*/
#define LV_USE_FS_POSIX 1
#if LV_USE_FS_POSIX
    #define LV_FS_POSIX_LETTER '/'     /*Set an upper cased letter on which the drive will accessible (e.g. 'A')*/
    #define LV_FS_POSIX_PATH "/"         /*Set the working directory. File/directory paths will be appended to it.*/
    #define LV_FS_POSIX_CACHE_SIZE 2    /*>0 to cache this number of bytes in lv_fs_read()*/
#endif

2.设置MEM大小 

初始的空间开很小，导致图片加载不出来

 #define LV_MEM_SIZE (16 * 1024 * 1024U)          /*[bytes]*/
//根据自己的需求开空间

3.使用

    lv_obj_t *bg_img = lv_img_create(main_ui->bg);
    lv_img_set_src(bg_img, "/mnt/userdata/1.png");
    lv_obj_set_size(bg_img, 320, 480);