No Data on the LCD

[MyVanitar]

Hi,

I used the library with this code:

extern const uint8_t mygif_map[];

.
.
.
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lv_obj_t * par = lv_obj_create(lv_scr_act(), NULL); /*Create a parent object on the current screen*/
lv_obj_set_size(par, 320, 240);
lv_obj_t * img = lv_gif_create_from_data(par, mygif_map);

However, the LCD shows this:

[kisvegabor]

Hi, Please open an issue at https://github.com/lvgl/lv_lib_gif and attach the original gif too. Thank you! Regards, Gabor Hesam Moshiri ***@***.***> ezt írta (időpont: 2021. ápr. 21., Sze, 15:55):

…

[image: 20210421_182148] <https://user-images.githubusercontent.com/18719591/115565804-f0b09880-a2ce-11eb-8b30-200e27d3e9a0.jpg> Hi, I used a library with this code: extern const uint8_t mygif_map[]; .. . .. .  lv_obj_t * par = lv_obj_create(lv_scr_act(), NULL); /*Create a parent object on the current screen*/ lv_obj_set_size(par, 320, 240); lv_obj_t * img = lv_gif_create_from_data(par, mygif_map); However, the LCD shows this: — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#24>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABZ7JVRVQYFH5OWJAVV2NODTJ3KNRANCNFSM43KNJL5A> .

[MyVanitar]

Hi,

Yes, I have opened the issue at the right address, which is here. I attached the original gif.

[kisvegabor]

Uh sorry. Somehow I thought it's an email, not a GitHub notification... 😅

I'll test it tomorrow.

[kisvegabor]

I've checked it and I see the gif but it freezes after ~10 frames. It seems it's a bug in the gif decoder.
I've opened an issue for it lecram/gifdec#13

Does the decoder work with the example gif?
https://github.com/lvgl/lv_lib_gif/blob/master/example_gif.c

[MyVanitar]

I first tested this on the CodeBlock, as you said it freezes after the frames finish and when it tries to re-start the frames. I have not tested the example gif. I will do and inform you.
For this experiment (my own gif), I don't know what hardware do you use, In my case, RAM and FLASH memories were not full, however, I received that message on the LCD. reason is unkown

[MyVanitar]

I tested the example GIF. it shows it on the screen, but no animation.

[MyVanitar]

This is memory consumption information for the example gif:

[kisvegabor]

I first tested this on the CodeBlock, as you said it freezes after the frames finish and when it tries to re-start the frames. I have not tested the example gif. I will do and inform you.

For me, it froze after 12 frames but the gif has > 20 frames.

Please enable LVGL's logging in lv_conf.h with LV_LOG_WARN level and post the result.

[MyVanitar]

For me, it froze after 12 frames but the gif has > 20 frames.
Please enable LVGL's logging in lv_conf.h with LV_LOG_WARN level and post the result.

Should I test with which gif file, the example gif, or my own gif?
on the hardware or on the CodeBlock?

[kisvegabor]

With the example gif please, to find out why it doesn't run.

[MyVanitar]

Okay. I enabled the LVGL log like this with printf

I received these two warning in the console when the tracer:

Warn: Couldn't allocate memory 	(lv_mem.c #199 lv_mem_alloc())
Warn: Couldn't allocate memory 	(lv_mem.c #306 lv_mem_realloc())

[MyVanitar]

These are the memory configurations in lv-conf.h

#define LV_DISP_ROT_MAX_BUF (10U * 1024U)
#define LV_MEM_SIZE (32U * 1024U)

[kisvegabor]

The gif decoding needs a lot of memory to store temporary data from the previous frames. I've pushed fix to slightly lower but with 16 bit color depth it's still 4 x image_size bytes. With the example gif, it's 4 x 60 x 80 = 16,000 plus some extra memory used during decoding the gif.

Does it work if you increase LV_MEM_SIZE to 48U * 1024U?

[MyVanitar]

Yes, it worked with 48U and I can see the animation. The speed of the animation is "a bit" slower than the actual test on a PC, however, the difference is not significant. The LCD bus is SPI which I flush the data using DMA. the main clock is 168MHz.

is there any method to inform the LVGL engine to use external SRAM? I can connect an external SRAM to the MCU using FSMC and I know the SRAM start address would be something like 0xC00000000 for example.

[kisvegabor]

is there any method to inform the LVGL engine to use external SRAM? I can connected an external SRAM to the MCU using FSMC and I know the SRAM start address would be something like 0xC00000000 for example.

Yes, use LV_MEM_ADR in lv_conf.h.
From the 0xC000000 address, I suppose you use an ST MCU. For someone, it wasn't working well. See here. But I assume it's "only" a memory configuration issue.

[MyVanitar]

Yes, use LV_MEM_ADR in lv_conf.h.
From the 0xC000000 address, I suppose you use an ST MCU. For someone, it wasn't working well. See here. But I assume it's "only" a memory configuration issue.

Yes, I use STM32. Thank you for your support.
By the way, this thread remains open till that freezing problem gets solved. The CodeBlock also freezes with that GIF file.

[kisvegabor]

New comment here lecram/gifdec#13

[kisvegabor]

@lecram has fixed the issue of the gif decoder and I updated our decoder accordingly.
Now the gif with the long-haired girl works well.