V6.0.2 update to V8.0.1 devices work abnormal

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Description

I have a devices which runs a project based on lvgl-V6.0.2 version, and now I update the lvgl library to V8.0.1 and run some demo on it(I display a image and run the docs example lv_example_btn_1()), and I found it has some problem. The image is shown successfully, but the button example, when I clicked the btn , the screen start flashing, and the botton effect seems not occur.

my disp is inited double buffering, is there double buffering has some different between V8.0.1 and V6.0.2

What MCU/Processor/Board and compiler are you using?

TI ARM335X

What do you want to achieve?

What have you tried so far?

I have checked the porting steps from my 6.0.2 version project, it has ported to the 8.0.1version succesfuly. the same initial, the same devices.

Code to reproduce

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/*You code here*/

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Well. The draw_buf in v8.0 need to be setting with static, did u do that?
Heres the blog of release v8.0.

of course

 /* Example for 3) also set disp_drv.full_refresh = 1 below*/
    static lv_disp_draw_buf_t draw_buf_dsc_3;
    static lv_color_t buf_3_1[MY_DISP_HOR_RES * MY_DISP_VER_RES];            /*A screen sized buffer*/
    static lv_color_t buf_3_2[MY_DISP_HOR_RES * MY_DISP_VER_RES];            /*An other screen sized buffer*/
    lv_disp_draw_buf_init(&draw_buf_dsc_3, buf_3_1, buf_3_2, MY_DISP_HOR_RES * MY_DISP_VER_RES);   /*Initialize the display buffer*/

    /*-----------------------------------
     * Register the display in LVGL
     *----------------------------------*/

    static lv_disp_drv_t disp_drv;                         /*Descriptor of a display driver*/
    lv_disp_drv_init(&disp_drv);                    /*Basic initialization*/

    /*Set up the functions to access to your display*/

    /*Set the resolution of the display*/
    disp_drv.hor_res = MY_DISP_HOR_RES;
    disp_drv.ver_res = MY_DISP_VER_RES;

    /*Used to copy the buffer's content to the display*/
    disp_drv.flush_cb = disp_flush;

    /*Set a display buffer*/
    disp_drv.draw_buf = &draw_buf_dsc_3;

    /*Required for Example 3)*/
    //disp_drv.full_refresh = 1

    /* Fill a memory array with a color if you have GPU.
     * Note that, in lv_conf.h you can enable GPUs that has built-in support in LVGL.
     * But if you have a different GPU you can use with this callback.*/
    //disp_drv.gpu_fill_cb = gpu_fill;

    /*Finally register the driver*/
    lv_disp_drv_register(&disp_drv);

hey, I find the fault in my code. It should open disp_drv.full_refresh = 1. I add this condition then it work ok

okay. but full refresh sounds like need do more work, does it effect the frame rate?

No, it works well after I add disp_drv.full_refresh = 1., I had already run 2 examples in my devices

As you discovered v8 changed the behavior for two full-screen buffers. You can restore behavior closer to v7 by enabling full_refresh.