The chart does not work correctly on the last commit

REZA_N · April 27, 2022, 7:39am

Description

hello everyone,
I update the LVGL code, last commit id is 8b1500756
but I think there is some bug, my chart works with the v8.2 tag but this commit doesn’t work correctly I understood in debugging that “LV_EVENT_DRAW_MAIN” event of the chart does not send

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

stm32f4

What LVGL version are you using?

last version

pete-pjb · April 27, 2022, 8:13am

Hi @REZA_N,

Does you chart have any parts which are using any level of transparency?

If so it might be worth updating to the latest commit and taking a look at this post from yesterday:

github.com/lvgl/lvgl

Latest Master Commits today appear to be causing a problem if an object has OPA value less than 100%.

opened 03:26PM - 26 Apr 22 UTC

closed 03:52PM - 26 Apr 22 UTC

pete-pjb

Since the latest master commits today when LVGL attempts to render an object wit…h an OPA value less than 100%, the following message is generated if logging is enabled: [Warn] (120.944, +167) refr_obj: Rendering this widget needs LV_COLOR_SCREEN_TRANSP 1 (in lv_refr.c line #872) The object concerned is also not being rendered correctly. Just as an experiment I have tried LV_COLOR_SCREEN_TRANSP 1 in lv_conf.h and rebuilt the library This fixes the problem in the simulator with the test code below, but on my target hardware I just get a blank black screen with the same configuration. I also tried adding the following lines to my driver initialisation code but I still just get a blank black screen on my target system. ```c lv_obj_set_style_bg_opa(lv_scr_act(), LV_OPA_TRANSP, LV_PART_MAIN | LV_STATE_DEFAULT); lv_disp_set_bg_opa(NULL, LV_OPA_TRANSP); ```` Some test code: ```c #define NO_MSG_SLOTS 10 #define MSG_B_SIZEX 1014 #define MSG_B_SIZEY 40 #define MSG_ANIM_TIME 1000 #define MSG_DISP_TIME 5000 static void anim_x_cb(void * var, lv_coord_t v) { lv_obj_set_x(var, v); } static void anim_x_cb1(void * var, lv_coord_t v) { // This is required as you can't call the same function from two different animation parts! lv_obj_set_x(var, v); } char *sys_msgs[] = { "System message 1", "System message 2", "System_message 3", }; static void show_sys_message( uint16_t message_id ) { static uint8_t msg_pos = 0, first_call = true; static lv_obj_t *mbox[NO_MSG_SLOTS]; static lv_style_t mbox_style; static lv_anim_t a1[NO_MSG_SLOTS], a2[NO_MSG_SLOTS]; static lv_anim_timeline_t *anim_timeline[NO_MSG_SLOTS]; if( first_call ) { lv_style_init(&mbox_style); lv_style_set_radius(&mbox_style, 3); lv_style_set_opa(&mbox_style, LV_OPA_70); lv_style_set_border_width(&mbox_style, 2); lv_style_set_text_align(&mbox_style, LV_TEXT_ALIGN_CENTER); for( uint8_t i = 0; i < NO_MSG_SLOTS; i++ ) { mbox[i] = lv_textarea_create(lv_scr_act()); lv_textarea_set_one_line(mbox[i], true); lv_obj_add_style(mbox[i], &mbox_style, LV_PART_MAIN); lv_obj_set_width( mbox[i], MSG_B_SIZEX); lv_obj_set_pos(mbox[i], SDL_HOR_RES, (105 + (MSG_B_SIZEY * i)) ); lv_anim_init(&a1[i]); lv_anim_set_var(&a1[i], mbox[i]); lv_anim_set_values(&a1[i], SDL_HOR_RES, (SDL_HOR_RES - MSG_B_SIZEX - 10)); lv_anim_set_time(&a1[i], MSG_ANIM_TIME); lv_anim_set_exec_cb(&a1[i], (lv_anim_exec_xcb_t)anim_x_cb); lv_anim_set_path_cb(&a1[i], lv_anim_path_ease_in); lv_anim_init(&a2[i]); lv_anim_set_var(&a2[i], mbox[i]); lv_anim_set_values(&a2[i], (SDL_HOR_RES - MSG_B_SIZEX - 10), SDL_HOR_RES); lv_anim_set_time(&a2[i], MSG_ANIM_TIME); lv_anim_set_exec_cb(&a2[i], (lv_anim_exec_xcb_t) anim_x_cb1); lv_anim_set_path_cb(&a2[i], lv_anim_path_ease_in); anim_timeline[i] = lv_anim_timeline_create(); lv_anim_timeline_add(anim_timeline[i], 0, &a1[i]); lv_anim_timeline_add(anim_timeline[i], MSG_DISP_TIME, &a2[i]); } first_call = false; } lv_textarea_set_text(mbox[msg_pos], sys_msgs[message_id]); lv_obj_move_foreground( mbox[msg_pos] ); lv_anim_timeline_start(anim_timeline[msg_pos]); if( msg_pos++ == NO_MSG_SLOTS ) msg_pos = 0; } show_sys_message( 0 ); ``` Prior to todays updates I have never had to use LV_COLOR_SCREEN_TRANSP 1 in lv_conf.h maybe this is an ongoing mistake on my part but either way I can't seem to get things to work correctly since this update. @kisvegabor if you have any suggestions as to where I should be looking for a solution to this I would very much appreciate some pointers. Kind Regards, Pete

Hope that helps.

Cheers,

Pete

REZA_N · April 27, 2022, 9:51am

thanks pete-pjb
Yes, my chart has some parts that are transparent(lv_opa_0), also I have some problems in the image that I set “transform_zoom”
I did these steps but it did not work
1- git pull LVGL code: my last commit is ff7204eca which is the post you recommend
2- set “LV_COLOR_SCREEN_TRANSP” to 1 in the lvgl.conf

pete-pjb · April 27, 2022, 10:02am

Hi @REZA_N,

I am sorry that was not helpful, I just saw your post and it seemed it could be related. We will need to ask @kisvegabor if he can comment, the recent updates are extensive and I am not familiar with the code in the area of the update.

It might be worth raising a Github issue also.

Kind Regards,

Pete

REZA_N · April 30, 2022, 6:56am

Thank you for your help.
Does anybody have other suggestions?

kisvegabor · May 4, 2022, 6:42pm

Hi @REZA_N

Please a send a code snippet to reproduce the issue. There was a large updated related to opacity and transformations so it can happen that something is not perfect yet.

REZA_N · May 5, 2022, 9:40am

Hello kisvegabor
chart.txt (7.7 KB)

REZA_N · May 7, 2022, 12:40pm

hello @kisvegabor
I think this could be related to the amount of CPU used:
I get the data from a module then I send the data to the chart for drawing in realtime, the chart doesn’t change also the system doesn’t work correctly,
you think the system stopped until I turn off the module and the data sending to the chart is finished, then the chart is drawn according to the last data sended

in brief, I think drawing the chart consumed a lot of CPU that other parts of LVGL cant work

kisvegabor · May 10, 2022, 5:09pm

I couldn’t use the attached code because there was a lot of undefined variables and FreeRTOS specific functions. Having a minimal code just to demonstrate problem would be great.

LVGL refreshed the dirty areas sequentially. So the normally the worst thing that can happen is that you will get a low FPS, but not reduced functionality.

REZA_N · May 11, 2022, 4:28am

Hello @kisvegabor
I updated the LVGL codes today, the chart is drawing in realtime but the CPU used is about 80 percent however CPU used is about 40 percent in the V8.2

ok, I check my code again and I try to simplify it

REZA_N · May 11, 2022, 5:57am

I simplified the code please check the code:
chart2.txt (6.1 KB)
PS: I couldn’t use the simulator with the latest version of LVGL as I get compile error with lvgl8.3