Bus_RGB : "intr_alloc: No free interrupt inputs for LCD_CAM interrupt" with ESP32S3

[OldMicroGuy]

****** Edit ******
This seems to stem from the pioarduino. If I force a revert back to Arduino ver 6.12.0, it works as expected.
Still, any ideas or work arounds?

I can't get around this. I'm using an old LGFX config file (LGFX), so I know it worked.
I get this errors when I use lcd.(init) and lcd.begin() (LGFX).
I'm using an Elecrow 7" HMI display board. I've just been trying to get this working again (without using their old outdated examples). So far, all I got is the backlight to turn on. So I'm not doing anything except trying to init the display, clear it, try to fill screen with a color, so I know I'm talking to it, THEN I'll try getting lvgl going again.

All I can figure, is it has to do with interrupts, or camera usage, but I'm not doing anything. I don't even have touch pad/screen set up yet.

LCD Init
E (2072) intr_alloc: No free interrupt inputs for LCD_CAM interrupt (flags 0x80E)
END LCD Init
LCD Begin
E (2158) lcd_panel.io.i80: esp_lcd_new_i80_bus(173): no free i80 bus slot
END LCD Begin

[tobozo]

maybe the looptask runs on a different core?

when no interrupts are available on core 0, try core 1 😉

[OldMicroGuy]

I haven't used that function before, exactly how would I go about that?
I'm not running anything else, no FreeRTOS or anything. At the moment, it's just the the most basic you can get.

[tobozo]

or it could be a change in espressif core, for example esp-idf 5.4.4 https://release-notes.espressif.tools/release/5.4.4 dropped a flag used by LovyanGFX, this could be a side effect

• The SPI master and slave no longer accepts ESP_INTR_FLAG_SHARED as interrupt flag during initialization.
87a73d7f

[OldMicroGuy]

I tried a suggestion to run in another core. But it doesn't work, because the setup throws the error, not the running of it. (I'm sure I'm not doing it the best way anyway). I just can't get past set up, in either core.
I'll look at your last post and see what I can see. But, that's IDF, unless pioarduino is based on that, I can't do anything with it.
If forced, I "can" use the older Arduino code, it's just such a pain.

[tobozo]

the last pre-idf-5.4.4 esp32 core release is 55.03.37

in platformio.ini that would look like this:

platform = https://github.com/pioarduino/platform-espressif32.git#55.03.37

[OldMicroGuy]

Nope, it's not that one. Same error.

[OldMicroGuy]

just fyi, I started an issue with arduinoesp32 (https://github.com/espressif/arduino-esp32/issues) and they closed it right off saying it had nothing to do with them and it's a lovyan issue.

right now, I'm not sure if my display not working is causing this, or this is causing my display not working..... It used to work, so I'm guessing I'm doing something wrong, somehow (even though I just copied it as is).

[tobozo]

they closed it right off saying it had nothing to do with them and it's a lovyan issue.

yup it's a LovyanGFX issue, very likely some unmigrated code in Bus_RGB.cpp

unless you know how to fix it I suggest you stick with an espressif32 core version that supports it

LovyanGFX/src/lgfx/v1/platforms/esp32s3/Bus_RGB.cpp

Lines 343 to 346 in c14105d

	esp_intr_alloc_intrstatus(sigs->irq_id, isr_flags,
	(uint32_t)&dev->lc_dma_int_st,
	LCD_LL_EVENT_VSYNC_END, lcd_default_isr_handler, this, &_intr_handle);
	esp_intr_enable(_intr_handle);

If I force a revert back to Arduino ver 6.12.0, it works as expected.

apparently platformio espressif32 core 6.12.0 is based on idf 5.5.0, so the corresponding platform package on pioarduino is 55.03.30-2

platform = https://github.com/pioarduino/platform-espressif32.git#55.03.30-2

[OldMicroGuy]

Not sure if that was it or not, but that version still prevents LVGL from running. The code is running, but nothing on the screen.
I'm just stuck with old platform until there's a fix, oh well, at least I can move forward some.
The newer arduino platforms are just incompatible with Lovyan/lvgl at the moment. (or just lvgl, I have no idea any longer)

[tobozo]

but that version still prevents LVGL from running

what version of LovyanGFX are you pulling?
the latest release v1.2.21 was stripped from any conflicts with LVGL

https://github.com/lovyan03/LovyanGFX/releases/tag/1.2.21

[OldMicroGuy]

I'm using the latest, 1.2.21.
I thought the problem (with blank screen) was caused by either the duplicate definitions (never did compile) or the error about no interrupts available, no i80 bus.
I've been fighting several issues at once.
All I can say now is the code I have, using lvgl/lovyan, works with an older arduino core, but not with the newer versions. I've tried a couple older cores, but so far, no luck, so I don't know how far I have to go back. And I can't tell where the issue is, lovyan, lvgl, or the arduino core.
Personally, I think it's the core. Now the project that just compiled and ran yesterday, won't even compile, and the only thing I did was update the core in platformio, because it wouldn't use the later version of arduino (as of some date in feb 2026, the core had to be updated to run them, sorry I don't have the specific error, I'll look and see what I can pull from my browse history).

[OldMicroGuy]

This was the error platformio gave when trying to use the later version of arduino.
"IncompatiblePlatform: Development platform 'espressif32' is not compatible with PlatformIO Core v6.1.18 and depends on PlatformIO Core >=6.1.19."
Something came up about a date in Feb. 2026, as when the change was made.
You're supposed to be able to upgrade by "pio pkg upgrade", but I had to delete, cache, platforms, python3 and penv before it would upgrade.
Now I can't seem to switch back to older versions. Now I'm getting all kinds of errors on stuff that worked fine.
** the "errors" were on me, wrong project setting.
But the blank screen issue on newer arduino cores holds true. Project works with
platform = espressif32 @ 6.12.0
but not something like
https://github.com/pioarduino/platform-espressif32/releases/download/55.03.38-1/platform-espressif32.zip
(sorry this is confusing)

[OldMicroGuy]

I tried to narrow it down, some of the cores I couldn't run for various reasons.
But core 54.03.21 is the last version I got to work. A couple after that, I could not to install, and nothing after that worked.
If it helps, all I get is a vertical colored line (I don't know if it's random or not, but looks like my screen test (red/green/blue) and it seems to be located on the side of the screen configured as "0/0". But hard to say with rotation.
Code runs, just no screen.