Since the LVGL API has changed, micropython builds for rp2 port COLOR_DEPTH=16 build error

ngc6589 · March 15, 2023, 3:55am

I am using lv_micropython to create an application. I have the latest commit and the firmware build fails.

$ git clone https://github.com/lvgl/lv_micropython.git

Commits on Mar 14, 2023 43ac0377a740559086a6d9aa550b1bf0bfa6e3d6

$ cd lv_micropython
$ git submodule update --init --recursive lib/lv_bindings
$ vim lib/lv_bindings/lv_conf.h
$ grep -i color_depth lib/lv_bindings/lv_conf.h
#ifndef LV_COLOR_DEPTH
#define LV_COLOR_DEPTH 16

$ make -C ports/rp2 BOARD=PICO submodules
$ make -C mpy-cross V=1
OK

$ make -C ports/rp2 BOARD=PICO USER_C_MODULES=../../lib/lv_bindings/bindings.cmake V=1

MPY _boot_fat.py
MPY rp2.py
MPY _boot.py
MPY ds18x20.py
MPY onewire.py
MPY dht.py
MPY uasyncio/__init__.py
MPY uasyncio/core.py
MPY uasyncio/event.py
MPY uasyncio/funcs.py
MPY uasyncio/lock.py
MPY uasyncio/stream.py
MPY neopixel.py
GEN /home/masahiro/lv_micropython/ports/rp2/build-PICO/frozen_content.c
[  4%] Generating genhdr/moduledefs.split
[  4%] Generating genhdr/moduledefs.collected
Module registrations updated
[  4%] Generating genhdr/moduledefs.h
Scanning dependencies of target firmware
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' から出ます
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' に入ります
[  4%] Building C object CMakeFiles/firmware.dir/home/masahiro/lv_micropython/py/argcheck.c.obj
In file included from /home/masahiro/lv_micropython/lib/lv_bindings/lvgl/src/misc/../draw/lv_img_buf.h:17,
                 from /home/masahiro/lv_micropython/lib/lv_bindings/lvgl/src/misc/../draw/lv_img_decoder.h:19,
                 from /home/masahiro/lv_micropython/lib/lv_bindings/lvgl/src/misc/../draw/lv_img_cache.h:16,
                 from /home/masahiro/lv_micropython/lib/lv_bindings/lvgl/src/misc/lv_gc.h:22,
                 from /home/masahiro/lv_micropython/ports/rp2/mpconfigport.h:190,
                 from /home/masahiro/lv_micropython/py/mpconfig.h:62,
                 from /home/masahiro/lv_micropython/py/mpstate.h:31,
                 from /home/masahiro/lv_micropython/py/runtime.h:29,
                 from /home/masahiro/lv_micropython/py/argcheck.c:30:
/home/masahiro/lv_micropython/lib/lv_bindings/lvgl/src/misc/../draw/../misc/lv_color.h: In function 'lv_color_mix':
/home/masahiro/lv_micropython/lib/lv_bindings/lvgl/src/misc/../draw/../misc/lv_color.h:589:23: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
  589 |     uint16_t c1_16 = *(uint16_t *)&c1;
      |                       ^~~~~~~~~~~~~~~
/home/masahiro/lv_micropython/lib/lv_bindings/lvgl/src/misc/../draw/../misc/lv_color.h:590:23: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
  590 |     uint16_t c2_16 = *(uint16_t *)&c2;
      |                       ^~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[3]: *** [CMakeFiles/firmware.dir/build.make:699: CMakeFiles/firmware.dir/home/masahiro/lv_micropython/py/argcheck.c.obj] エラー 1
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' から出ます
make[2]: *** [CMakeFiles/Makefile2:1329: CMakeFiles/firmware.dir/all] エラー 2
make[2]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' から出ます
make[1]: *** [Makefile:91: all] エラー 2
make[1]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' から出ます
make: *** [Makefile:27: all] エラー 2
make: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2' から出ます

Should I wait a little longer?

kdschlosser · March 15, 2023, 4:11am

what version of LVGL are you running?

I also want to make sure you are using the correct build commands.

This is the order in which things need to be done.

git clone https://github.com/lvgl/lv_micropython.git

cd lv_micropython

git submodule update --init --recursive lib/lv_bindings

make -C ports/rp2 submodules

sudo apt update

sudo apt install cmake gcc-arm-none-eabi libnewlib-arm-none-eabi build-essential

make -C mpy-cross

cd ports/rp2

make BOARD=PICO USER_C_MODULES="../../lib/lv_bindings/bindings.cmake"

kdschlosser · March 15, 2023, 4:13am

I believe that enclosing the USER_C_MODULES in double quotes. might have an effect on it. It did for the last user that had compilation issues when compiling for the RP2

ngc6589 · March 15, 2023, 5:15am

What is the version of LVGL?

lv_micropython is the latest version of the LVGL master branch as it is cheked out in submodules.

I have been able to build with and without " UESR_C_MODULES= on mine.

Incidentally, I can BUILD with COLOR_DEPTH=32 without any problem, but with COLOR_DEPTH=16 I have some problems.

$ make -C ports/rp2 BOARD=PICO USER_C_MODULES="../../lib/lv_bindings/bindings.cmake" V=1
make: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2' に入ります
[ -e build-PICO/CMakeCache.txt ] || cmake -S . -B build-PICO -DPICO_BUILD_DOCS=0 -DMICROPY_BOARD=PICO -DUSER_C_MODULES=../../lib/lv_bindings/bindings.cmake
make -s -C build-PICO
make[1]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' に入ります
make[2]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' に入ります
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' に入ります
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' から出ます
[  0%] Built target bs2_default
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' に入ります
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' から出ます
[  1%] Built target bs2_default_padded_checksummed_asm
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' に入ります
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' から出ます
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' に入ります
[  1%] Performing build step for 'ELF2UF2Build'
make[4]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO/elf2uf2' に入ります
make[5]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO/elf2uf2' に入ります
make[6]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO/elf2uf2' に入ります
Consolidate compiler generated dependencies of target elf2uf2
make[6]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO/elf2uf2' から出ます
[100%] Built target elf2uf2
make[5]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO/elf2uf2' から出ます
make[4]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO/elf2uf2' から出ます
[  1%] No install step for 'ELF2UF2Build'
[  1%] Completed 'ELF2UF2Build'
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' から出ます
[  2%] Built target ELF2UF2Build
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' に入ります
[  2%] Generating genhdr/mpversion.h
[  2%] Generating frozen_content.c
Consolidate compiler generated dependencies of target firmware
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' から出ます
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' に入ります
[  2%] Generating genhdr/mpversion.h
[  2%] Building C object CMakeFiles/firmware.dir/home/masahiro/lv_micropython/py/argcheck.c.obj
In file included from /home/masahiro/lv_micropython/lib/lv_bindings/lvgl/src/misc/../draw/lv_img_buf.h:17,
                 from /home/masahiro/lv_micropython/lib/lv_bindings/lvgl/src/misc/../draw/lv_img_decoder.h:19,
                 from /home/masahiro/lv_micropython/lib/lv_bindings/lvgl/src/misc/../draw/lv_img_cache.h:16,
                 from /home/masahiro/lv_micropython/lib/lv_bindings/lvgl/src/misc/lv_gc.h:22,
                 from /home/masahiro/lv_micropython/ports/rp2/mpconfigport.h:190,
                 from /home/masahiro/lv_micropython/py/mpconfig.h:62,
                 from /home/masahiro/lv_micropython/py/mpstate.h:31,
                 from /home/masahiro/lv_micropython/py/runtime.h:29,
                 from /home/masahiro/lv_micropython/py/argcheck.c:30:
/home/masahiro/lv_micropython/lib/lv_bindings/lvgl/src/misc/../draw/../misc/lv_color.h: In function 'lv_color_mix':
/home/masahiro/lv_micropython/lib/lv_bindings/lvgl/src/misc/../draw/../misc/lv_color.h:589:23: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
  589 |     uint16_t c1_16 = *(uint16_t *)&c1;
      |                       ^~~~~~~~~~~~~~~
/home/masahiro/lv_micropython/lib/lv_bindings/lvgl/src/misc/../draw/../misc/lv_color.h:590:23: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
  590 |     uint16_t c2_16 = *(uint16_t *)&c2;
      |                       ^~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[3]: *** [CMakeFiles/firmware.dir/build.make:699: CMakeFiles/firmware.dir/home/masahiro/lv_micropython/py/argcheck.c.obj] エラー 1
make[3]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' から出ます
make[2]: *** [CMakeFiles/Makefile2:1329: CMakeFiles/firmware.dir/all] エラー 2
make[2]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' から出ます
make[1]: *** [Makefile:91: all] エラー 2
make[1]: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2/build-PICO' から出ます
make: *** [Makefile:27: all] エラー 2
make: ディレクトリ '/home/masahiro/lv_micropython/ports/rp2' から出ます
masahiro@U2204LTS:~/lv_micropython$

amirgon · March 15, 2023, 7:37am

This is related to this GitHub issue. I suggest continuing this discussion there:

github.com/lvgl/lvgl

Dereferencing type-punned pointer will break strict-aliasing rules

opened 09:48PM - 03 Mar 23 UTC

amirgon

### Describe the bug ESP32 reports `dereferencing type-punned pointer will br…eak strict-aliasing rules` on `lv_color.h`: ``` [11/18] Building C object esp-idf/lvgl/CMakeFiles/__idf_lvgl.dir/src/misc/lv_color.c.obj In file included from /home/amirgon/projects/lv_micropython/lib/lv_bindings/lvgl/src/misc/lv_color.c:9: /home/amirgon/projects/lv_micropython/lib/lv_bindings/lvgl/src/misc/lv_color.h: In function 'lv_color_mix': /home/amirgon/projects/lv_micropython/lib/lv_bindings/lvgl/src/misc/lv_color.h:590:42: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] uint32_t bg = (uint32_t)((uint32_t)(*(uint16_t *)&c2) | ((uint32_t)(*(uint16_t *)&c2) << 16)) & ^~~~~~~~~~~~~~~ /home/amirgon/projects/lv_micropython/lib/lv_bindings/lvgl/src/misc/lv_color.h:590:74: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] uint32_t bg = (uint32_t)((uint32_t)(*(uint16_t *)&c2) | ((uint32_t)(*(uint16_t *)&c2) << 16)) & ^~~~~~~~~~~~~~~ /home/amirgon/projects/lv_micropython/lib/lv_bindings/lvgl/src/misc/lv_color.h:592:42: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] uint32_t fg = (uint32_t)((uint32_t)(*(uint16_t *)&c1) | ((uint32_t)(*(uint16_t *)&c1) << 16)) & 0x7E0F81F; ^~~~~~~~~~~~~~~ /home/amirgon/projects/lv_micropython/lib/lv_bindings/lvgl/src/misc/lv_color.h:592:74: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] uint32_t fg = (uint32_t)((uint32_t)(*(uint16_t *)&c1) | ((uint32_t)(*(uint16_t *)&c1) << 16)) & 0x7E0F81F; ^~~~~~~~~~~~~~~ ``` ### To Reproduce - Install esp-idf 4.4 (probably will happen with any other version as well) - run `. ./export.sh` on esp-idf dir to setup esp-idf - Build lv_micropython esp32 port with this command: `make -C ports/esp32 LV_CFLAGS="-DLV_COLOR_DEPTH=16" BOARD=GENERIC_SPIRAM` This problem only happens when setting `LV_COLOR_DEPTH`

CC: @kisvegabor

ngc6589 · March 15, 2023, 7:49am

I see this is an issue on lvgl github.
Thank you very much.

kisvegabor · March 16, 2023, 5:01pm

It should be fixed now in LVGL.