Is there a really simple MacOS example with lvgl_micropython?

[mark-hoy]

I have a Macbook M2 and a Mac Mini M1 (where I do most of my development). First off, I'd like to really thank Kevin for the easy setup/build environment. I think the community would benefit from an example directory (especially since LVGL pulled their micropython example code from the v8.x code base when it went to v9.x).

Ideally, a simple Unix/Linux, MacOS and a Windows example along with a build line to further simplify it for us beginners that are new to this code base.
code/example/{unix,macos,windows}/easy.py

I am concerned that MacOS support may not be so simple for v9 lvgl as the event loop needs a timer and MacOS doesn't have librt.
LVGL Issue 269

IF MacOS is totally out of the question for the near-ish future, has anyone tried this in Ubuntu VM on Apple H/W?
Yesterday, I tried VMware Fusion Pro running an Ubuntu Server v24 Arm + GUI + build tools. It was simple enough to build an executable but when I ran it, SDL2 seems to need a 3d Graphics lib. Upon enabling "Accelerated 3D Graphics" the display grinds to almost a halt as I pan the mouse to get repaints of typing in a shell... There has to be a way, but this isn't it.

I plan on helping out with a GUI implemented with lvgl_micropython for an Elecrow 7" panel for FluidNC.

[kdschlosser]

I think with macks the hardware of the mac plays a HUGE role in it working properly or not.

Both the build and the use are simple.

python3 make.py macos DISPLAY=sdl_display INDEV=sdl_pointer

and the use should be pretty simple as well.

import lcd_bus
import sdl_display
import sdl_pointer
import lvgl as lv

bus = lcd_bus.SDLBus(flags=lcd_bus.SDLBus.WINDOW_BORDERLESS)

buf = bus.allocate_framebuffer(768000, 0)

display = sdl_display.SDLDisplay(
    data_bus=bus,
    frame_buffer1=buf,
    width=800,
    height=480,
    color_space=lv.COLOR_FORMAT.RGB565
)

display.init()

pointer = sdl_pointer.SDLPointer()

# code for GUI

import task_handler

task_handler.TaskHandler(5)

[kdschlosser]

also try installing libc...

brew install glibc

I can adjust the timer script to locate the libc.dynlib file if i is needed.

[mark-hoy]

Fixed two typos

    display_width=800,
    display_height=480,

I seem to be missing a MacOS timer

$ ./lvgl_micropy_macos test.py 
Traceback (most recent call last):
  File "test.py", line 24, in <module>
  File "task_handler.py", line 12, in <module>
RuntimeError: Missing machine.Timer implementation!

[mark-hoy]

and task_handler.py has the following:

try:
    from machine import Timer  # NOQA
except:
    try:
        from lv_timer import Timer  # NOQA
    except:
        raise RuntimeError("Missing machine.Timer implementation!")

[kdschlosser]

i am working on that now. Trying to find a cross platform timer

[kdschlosser]

OK I have a way to go about doing it. Gonna be tricky because of the callback being made from a different thread and not being able to access the repl.

[kdschlosser]

OK I updated the repo. Try it again, hopefully it will work.

[mark-hoy]

Fixed a couple of typos

diff --git a/builder/macOS.py b/builder/macOS.py
index 8dc29d0..9cbeee5 100644
--- a/builder/macOS.py
+++ b/builder/macOS.py
@@ -202,7 +202,7 @@ def submodules():
 
 
 def add_timer():
-    modmachine_path = 'lib/micropython/ports/unix/modmachin.c'
+    modmachine_path = 'lib/micropython/ports/unix/modmachine.c'
 
     with open(modmachine_path, 'rb') as f:
         data = f.read().decode('utf-8')
@@ -215,7 +215,7 @@ def add_timer():
         with open(modmachine_path, 'wb') as f:
             f.write(data.encode('utf-8'))
 
-    src_path = '/micropy_updates/macos/machine_timer.c'
+    src_path = 'micropy_updates/macos/machine_timer.c'
     dst_path = 'lib/micropython/ports/unix/machine_timer.c'
     shutil.copyfile(src_path, dst_path)
 

A build error, is there supposed to be a macOS version of modmachine.h?

$ python3 make.py macOS DISPLAY=sdl_display INDEV=sdl_pointer
HEAD is now at f461d91cd Updated to version 2.30.2 for release
...
machine_timer.c:6:10: fatal error: 'modmachine.h' file not found
#include "modmachine.h"

[kdschlosser]

OK I just pushed another commit. give it a try again and see if it works.

[mark-hoy]

I am thankful for your time toward this and I totally understand there are higher other priorities.

A fresh clone, followed by a build.

The start and end is shown below. I've also attached the entire build output
build.txt

$ git clone https://github.com/lvgl-micropython/lvgl_micropython.git
Cloning into 'lvgl_micropython'...
remote: Enumerating objects: 4510, done.
remote: Counting objects: 100% (1593/1593), done.
remote: Compressing objects: 100% (629/629), done.
remote: Total 4510 (delta 977), reused 1491 (delta 916), pack-reused 2917 (from 1)
Receiving objects: 100% (4510/4510), 1.08 MiB | 3.76 MiB/s, done.
Resolving deltas: 100% (2821/2821), done.

$ cd lvgl_micropython

$ python3 make.py macOS DISPLAY=sdl_display INDEV=sdl_pointer
HEAD is now at f461d91cd Updated to version 2.30.2 for release
Use make V=1 or set BUILD_VERBOSE in your environment to increase build verbosity.
Including User C Module from /Users/mark_hoy/git/lvgl_micropython/ext_mod/lcd_bus
.
.
.
CC ../../extmod/modlwip.c
CC ../../extmod/modmachine.c
-e See https://github.com/micropython/micropython/wiki/Build-Troubleshooting
../../extmod/modmachine.c:244:5: error: expected expression
MICROPY_PY_MACHINE_EXTRA_GLOBALS
^
../../ports/unix/modmachine.c:81:107: note: expanded from macro 'MICROPY_PY_MACHINE_EXTRA_GLOBALS'
#define MICROPY_PY_MACHINE_EXTRA_GLOBALS { MP_ROM_QSTR(MP_QSTR_Timer), MP_ROM_PTR(&machine_timer_type) }, \
^
../../extmod/modmachine.c:247:8: error: invalid application of 'sizeof' to an incomplete type 'const mp_rom_map_elem_t[]' (aka 'const struct _mp_rom_map_elem_t[]')
static MP_DEFINE_CONST_DICT(machine_module_globals, machine_module_globals_table);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../py/obj.h:419:107: note: expanded from macro 'MP_DEFINE_CONST_DICT'
#define MP_DEFINE_CONST_DICT(dict_name, table_name) MP_DEFINE_CONST_DICT_WITH_SIZE(dict_name, table_name, MP_ARRAY_SIZE(table_name))
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
../../py/misc.h:126:33: note: expanded from macro 'MP_ARRAY_SIZE'
#define MP_ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
^
../../py/obj.h:413:21: note: expanded from macro 'MP_DEFINE_CONST_DICT_WITH_SIZE'
.used = n, \
^
../../extmod/modmachine.c:247:8: error: invalid application of 'sizeof' to an incomplete type 'const mp_rom_map_elem_t[]' (aka 'const struct _mp_rom_map_elem_t[]')
static MP_DEFINE_CONST_DICT(machine_module_globals, machine_module_globals_table);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../py/obj.h:419:107: note: expanded from macro 'MP_DEFINE_CONST_DICT'
#define MP_DEFINE_CONST_DICT(dict_name, table_name) MP_DEFINE_CONST_DICT_WITH_SIZE(dict_name, table_name, MP_ARRAY_SIZE(table_name))
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
../../py/misc.h:126:33: note: expanded from macro 'MP_ARRAY_SIZE'
#define MP_ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
^
../../py/obj.h:414:22: note: expanded from macro 'MP_DEFINE_CONST_DICT_WITH_SIZE'
.alloc = n, \
^
3 errors generated.
make: *** [build-standard/extmod/modmachine.o] Error 1
make: *** Waiting for unfinished jobs....
MPY argparse.py
MPY requests/__init__.py
MPY mip/__init__.py
MPY mip/__main__.py
MPY ssl.py
MPY display_driver_framework.py
MPY rgb_display_framework.py
MPY touch_cal_data.py
MPY touch_calibrate.py
MPY _indev_base.py
MPY button_framework.py
MPY encoder_framework.py
MPY keypad_framework.py
MPY pointer_framework.py
MPY fs_driver.py
MPY i2c.py
MPY io_expander_framework.py
MPY task_handler.py
MPY lv_timer.py
MPY sdl_pointer.py
MPY sdl_display.py
GEN build-standard/frozen_content.c
$ 

[kdschlosser]

pushed another commit for this.

[mark-hoy]

Still not building, here is the build output after a git pull.

build1.txt

[mark-hoy]

The following file seems truncated, it's also missing a linefeed at the end.

$ tail lib/micropython/ports/unix/modmachine.c 

static void mp_machine_idle(void) {
    #ifdef MICROPY_UNIX_MACHINE_IDLE
    MICROPY_UNIX_MACHINE_IDLE
    #else
    // Do nothing.
    #endif
}

#define MICROPY_PY_MACHINE_EXTRA_GLOBALS { MP_ROM_QSTR(MP_QSTR_Timer), MP_ROM_PTR(&machine_timer_type) }, \

[kdschlosser]

remove the backslash and the end of that line and compile it again. It shouldn't need to be there anywho because it's an array that the macro is getting used in and the C compiler isn't picky about newlines.

[kdschlosser]

also, don't do a git pull. delete and clone the library again. you doing a pull isn't updating the files that got modified the time before. That define is no longer in the modmachine.c file.

[mark-hoy]

From a fresh git clone

build3.txt

Mark-Hoys-Mini:git mark_hoy$ git clone https://github.com/lvgl-micropython/lvgl_micropython.git
Cloning into 'lvgl_micropython'...
remote: Enumerating objects: 4532, done.
remote: Counting objects: 100% (1615/1615), done.
remote: Compressing objects: 100% (642/642), done.
remote: Total 4532 (delta 991), reused 1504 (delta 921), pack-reused 2917 (from 1)
Receiving objects: 100% (4532/4532), 1.09 MiB | 4.54 MiB/s, done.
Resolving deltas: 100% (2836/2836), done.

Mark-Hoys-Mini:git mark_hoy$ cd lvgl_micropython
Mark-Hoys-Mini:lvgl_micropython mark_hoy$ python3 make.py macOS DISPLAY=sdl_display INDEV=sdl_pointer

collecting MicroPython 1.23.0
Submodule 'lib/micropython' (https://github.com/micropython/micropython) registered for path 'lib/micropython'
Cloning into '/Users/mark_hoy/git/lvgl_micropython/lib/micropython'...
.
.
.
CC ../../lib/berkeley-db-1.xx/mpool/mpool.c
CC machine_timer.c
CC main.c
CC gccollect.c
CC unix_mphal.c
CC mpthreadport.c
-e See https://github.com/micropython/micropython/wiki/Build-Troubleshooting
machine_timer.c:121:34: error: expected '}'
MP_ROM_QSTR(MP_QSTR_mode);
^
machine_timer.c:120:24: note: to match this '{'
mp_obj_t table[] = {
^
machine_timer.c:124:28: error: left operand of comma operator has no effect [-Werror,-Wunused-value]
args[ARG_callback].u_obj,
~~~~~~~~~~~~~~~~~~ ^~~~~
machine_timer.c:125:9: error: expression result unused [-Werror,-Wunused-value]
MP_ROM_QSTR(MP_QSTR_period);
^~~~~~~~~~~~~~~~~~~~~~~~~~~
../../py/obj.h:347:24: note: expanded from macro 'MP_ROM_QSTR'
#define MP_ROM_QSTR(q) MP_OBJ_NEW_QSTR(q)
^~~~~~~~~~~~~~~~~~
../../py/obj.h:96:31: note: expanded from macro 'MP_OBJ_NEW_QSTR'
#define MP_OBJ_NEW_QSTR(qst) ((mp_obj_t)((((mp_uint_t)(qst)) << 3) | 2))
^         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
machine_timer.c:130:29: error: expected parameter declarator
mp_map_init_fixed_table(&k_args, n_args - 1, table);
^
machine_timer.c:130:29: error: expected ')'
machine_timer.c:130:28: note: to match this '('
mp_map_init_fixed_table(&k_args, n_args - 1, table);
^
machine_timer.c:130:5: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
mp_map_init_fixed_table(&k_args, n_args - 1, table);
^
int
machine_timer.c:130:5: error: a function declaration without a prototype is deprecated in all versions of C and is treated as a zero-parameter prototype in C2x, conflicting with a previous declaration [-Werror,-Wdeprecated-non-prototype]
../../py/obj.h:485:6: note: conflicting prototype is here
void mp_map_init_fixed_table(mp_map_t *map, size_t n, const mp_obj_t *table);
^
machine_timer.c:130:5: error: conflicting types for 'mp_map_init_fixed_table'
mp_map_init_fixed_table(&k_args, n_args - 1, table);
^
../../py/obj.h:485:6: note: previous declaration is here
void mp_map_init_fixed_table(mp_map_t *map, size_t n, const mp_obj_t *table);
^
machine_timer.c:131:44: error: expected ')'
machine_timer_init_helper(self, n_args - 1, pos_args + 1, &k_args);
^
machine_timer.c:131:30: note: to match this '('
machine_timer_init_helper(self, n_args - 1, pos_args + 1, &k_args);
^
machine_timer.c:131:5: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
machine_timer_init_helper(self, n_args - 1, pos_args + 1, &k_args);
^
int
machine_timer.c:131:31: error: a parameter list without types is only allowed in a function definition
machine_timer_init_helper(self, n_args - 1, pos_args + 1, &k_args);
^
machine_timer.c:132:5: error: expected identifier or '('
return self;
^
machine_timer.c:133:1: error: extraneous closing brace ('}')
}
^
machine_timer.c:147:38: error: invalid application of 'sizeof' to an incomplete type 'struct macos_timer'
tim = (struct macos_timer *) malloc(sizeof (struct macos_timer));
^      ~~~~~~~~~~~~~~~~~~~~
machine_timer.c:146:9: note: forward declaration of 'struct macos_timer'
struct macos_timer *tim;
^
machine_timer.c:149:5: error: incomplete definition of type 'struct macos_timer'
tim->tim_queue = dispatch_queue_create("org.openzfsonosx.timerqueue", 0);
~~~^
machine_timer.c:146:9: note: forward declaration of 'struct macos_timer'
struct macos_timer *tim;
^
machine_timer.c:150:5: error: incomplete definition of type 'struct macos_timer'
tim->tim_timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, tim->tim_queue);
~~~^
machine_timer.c:146:9: note: forward declaration of 'struct macos_timer'
struct macos_timer *tim;
^
machine_timer.c:150:79: error: incomplete definition of type 'struct macos_timer'
tim->tim_timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, tim->tim_queue);
~~~^
machine_timer.c:146:9: note: forward declaration of 'struct macos_timer'
struct macos_timer *tim;
^
machine_timer.c:152:12: error: incompatible pointer types assigning to 'macos_timer *' from 'struct macos_timer *' [-Werror,-Wincompatible-pointer-types]
self->tim = tim;
^ ~~~
machine_timer.c:155:26: error: incomplete definition of type 'struct macos_timer'
dispatch_set_context(tim->tim_timer, self);
~~~^
machine_timer.c:146:9: note: forward declaration of 'struct macos_timer'
struct macos_timer *tim;
^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
make: *** [build-standard/machine_timer.o] Error 1
make: *** Waiting for unfinished jobs....

Mark-Hoys-Mini:lvgl_micropython mark_hoy$ tail micropy_updates/macos/machine_timer.c 
    MP_TYPE_FLAG_NONE,
    make_new, machine_timer_make_new,
    locals_dict, &machine_timer_locals_dict
);


MP_REGISTER_ROOT_POINTER(struct _machine_timer_obj_t *machine_timer_obj_head);

#define MICROPY_PY_MACHINE_EXTRA_GLOBALS { MP_ROM_QSTR(MP_QSTR_Timer), (mp_obj_t)&machine_timer_type },

[kdschlosser]

pushed a couple of commits

[mark-hoy]

Closer, as it's gotten past machine_timer.c

build4.txt

Mark-Hoys-Mini:git mark_hoy$ rm -rf lvgl_micropython
Mark-Hoys-Mini:git mark_hoy$ git clone https://github.com/lvgl-micropython/lvgl_micropython.git
Cloning into 'lvgl_micropython'...
remote: Enumerating objects: 4542, done.
remote: Counting objects: 100% (1625/1625), done.
remote: Compressing objects: 100% (550/550), done.
remote: Total 4542 (delta 1025), reused 1589 (delta 1021), pack-reused 2917 (from 1)
Receiving objects: 100% (4542/4542), 1.06 MiB | 3.21 MiB/s, done.
Resolving deltas: 100% (2869/2869), done.
Mark-Hoys-Mini:git mark_hoy$ cd lvgl_micropython
Mark-Hoys-Mini:lvgl_micropython mark_hoy$ python3 make.py macOS DISPLAY=sdl_display INDEV=sdl_pointer

collecting MicroPython 1.23.0
Submodule 'lib/micropython' (https://github.com/micropython/micropython) registered for path 'lib/micropython'

.
.
.

CC ../../lib/berkeley-db-1.xx/mpool/mpool.c
CC machine_timer.c
CC main.c
CC gccollect.c
CC unix_mphal.c
machine_timer.c:170:60: error: incompatible function pointer types initializing 'mp_fun_1_t' (aka 'void *(*)(void *)') with an expression of type 'mp_obj_t (machine_timer_obj_t *)' (aka 'void *(struct _machine_timer_obj_t *)') [-Wincompatible-function-pointer-types]
static MP_DEFINE_CONST_FUN_OBJ_1(machine_timer_deinit_obj, machine_timer_deinit);
^~~~~~~~~~~~~~~~~~~~
../../py/obj.h:376:42: note: expanded from macro 'MP_DEFINE_CONST_FUN_OBJ_1'
{{&mp_type_fun_builtin_1}, .fun._1 = fun_name}
^~~~~~~~
machine_timer.c:184:18: error: redefinition of 'args' with a different type: 'mp_arg_val_t[4]' (aka 'union _mp_arg_val_t[4]') vs 'const mp_obj_t *' (aka 'void *const *')
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
^
machine_timer.c:173:67: note: previous definition is here
static mp_obj_t machine_timer_init(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args)
^
CC mpthreadport.c
-e See https://github.com/micropython/micropython/wiki/Build-Troubleshooting
CC input.c
machine_timer.c:185:30: error: use of undeclared identifier 'pos_args'
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
^
machine_timer.c:189:46: error: member reference base type 'const mp_obj_t' (aka 'void *const') is not a structure or union
(machine_timer_obj_t *)args[ARG_self].u_obj,
~~~~~~~~~~~~~~^~~~~~
machine_timer.c:190:32: error: member reference base type 'const mp_obj_t' (aka 'void *const') is not a structure or union
(int16_t)args[ARG_mode].u_int,
~~~~~~~~~~~~~~^~~~~~
machine_timer.c:191:27: error: member reference base type 'const mp_obj_t' (aka 'void *const') is not a structure or union
args[ARG_callback].u_obj,
~~~~~~~~~~~~~~~~~~^~~~~~
machine_timer.c:192:34: error: member reference base type 'const mp_obj_t' (aka 'void *const') is not a structure or union
(int64_t)args[ARG_period].u_int
~~~~~~~~~~~~~~~~^~~~~~
7 errors generated.
make: *** [build-standard/machine_timer.o] Error 1
make: *** Waiting for unfinished jobs....
Mark-Hoys-Mini:lvgl_micropython mark_hoy$ vi ~/Downloads/build4.txt

^
machine_timer.c:189:46: error: member reference base type 'const mp_obj_t' (aka 'void *const') is not a structure or union
(machine_timer_obj_t *)args[ARG_self].u_obj,
~~~~~~~~~~~~~~^~~~~~
machine_timer.c:190:32: error: member reference base type 'const mp_obj_t' (aka 'void *const') is not a structure or union
(int16_t)args[ARG_mode].u_int,
~~~~~~~~~~~~~~^~~~~~
machine_timer.c:191:27: error: member reference base type 'const mp_obj_t' (aka 'void *const') is not a structure or union
args[ARG_callback].u_obj,
~~~~~~~~~~~~~~~~~~^~~~~~
machine_timer.c:192:34: error: member reference base type 'const mp_obj_t' (aka 'void *const') is not a structure or union
(int64_t)args[ARG_period].u_int
~~~~~~~~~~~~~~~~^~~~~~
7 errors generated.
make: *** [build-standard/machine_timer.o] Error 1
make: *** Waiting for unfinished jobs....

[kdschlosser]

give it another try

[mark-hoy]

This creates an executable. It's now got a DYLIB loading issue that I'll look at after supper

Mark-Hoys-Mini:app3 mark_hoy$ cp /opt/homebrew/lib/libSDL2-2.0.0.dylib .
Mark-Hoys-Mini:app3 mark_hoy$ ./lvgl_micropy_macos test.py 
dyld[13723]: Library not loaded: @rpath/libSDL2-2.0.0.dylib
  Referenced from: <22783D39-17A7-32C2-8979-DC331C1AFB07> /Users/mark_hoy/git/app/app3/lvgl_micropy_macos
  Reason: no LC_RPATH's found
Abort trap: 6

[mark-hoy]

The following stackoverflow article has ideas on how to fix this but the following makes me thing someone else has hit this.

lib/SDL/CMakeLists.txt:# !!! FIXME: this should probably do "MACOSX_RPATH ON" as a target property

RPATH on OSX

[kdschlosser]

copy the SDL dynlib from the lib/micropython/ports/unix/build-standard folder into the /build folder.

I'll fix the issue right now so it copies the file at the end of the build. Now that I have the complete filename of the sdl dynamic library.

[kdschlosser]

the issue with rpath is you have to provide an absolute path to where the dynamic library is. I didn't want to use any version of SDL2 that a user may have installed onto their system. I only want it to use the one that is compiled. The way clang works makes it impossible to link to a static library if there is a dynamic library available on the system... The unix build SDL2 is built into the micropython binary but on macos I am not able to do that,m it has to be separate. It sucks.

[mark-hoy]

Thanks, rebuilding it all now.

[kdschlosser]

fingers crossed that the timer works properly

[mark-hoy]

The file test.py contains the suggested code you wrote earlier in this discussion.

The lvgl_micropy_macos run without error, but upon loading the test.py fails to find the timer.

Mark-Hoys-Mini:lvgl_micropython mark_hoy$ cat test.py
import lcd_bus
import sdl_display
import sdl_pointer
import lvgl as lv

bus = lcd_bus.SDLBus(flags=lcd_bus.SDLBus.WINDOW_BORDERLESS)

buf = bus.allocate_framebuffer(768000, 0)

display = sdl_display.SDLDisplay(
    data_bus=bus,
    frame_buffer1=buf,
    display_width=800,
    display_height=480,
    color_space=lv.COLOR_FORMAT.RGB565
)

display.init()

pointer = sdl_pointer.SDLPointer()

# code for GUI

import task_handler

task_handler.TaskHandler(5)
Mark-Hoys-Mini:lvgl_micropython mark_hoy$ ./build/lvgl_micropy_macos test.py
Traceback (most recent call last):
  File "test.py", line 24, in <module>
  File "task_handler.py", line 12, in <module>
RuntimeError: Missing machine.Timer implementation!
Mark-Hoys-Mini:lvgl_micropython mark_hoy$ head -15 api_drivers/common_api_drivers/frozen/other/task_handler.py 
import lvgl as lv  # NOQA
import micropython  # NOQA
import sys
import time

try:
    from machine import Timer  # NOQA
except:
    try:
        from lv_timer import Timer  # NOQA
    except:
        raise RuntimeError("Missing machine.Timer implementation!")


TASK_HANDLER_STARTED = 0x00

[kdschlosser]

give it a try again....

[mark-hoy]

Removed directory, git clone'd, built with executable.. SegFault. I added some print statements to test.py and it's in the task_handler call.

Crash report build5.txt

Mark-Hoys-Mini:lvgl_micropython mark_hoy$ ./build/lvgl_micropy_macos 
LVGL MicroPython 1.23.0 on 2024-09-25; darwin [GCC 4.2.1] version
Use Ctrl-D to exit, Ctrl-E for paste mode
>>> import test
Segmentation fault: 11

[kdschlosser]

ok the segfault should now be fixed

[kdschlosser]

yes it should be. it is fixed now. I really need to use an IDE that has full support for python and C code. It would make things easier. I really don't want to learn a new IDE tho.

[mark-hoy]

Yeah, I have used emacs for so long on Linux that using/understanding VisualStudio is a tough slog.

And we mostly have a winner. The code compiles, runs and doesn't segfault.

However, it also doesn't bring up a window.

Mark-Hoys-Mini:lvgl_micropython mark_hoy$ ./build/lvgl_micropy_macos 
LVGL MicroPython 1.23.0 on 2024-09-26; darwin [GCC 4.2.1] version
Use Ctrl-D to exit, Ctrl-E for paste mode
>>> import test
>>> 
Mark-Hoys-Mini:lvgl_micropython mark_hoy$ cat test.py
import lcd_bus
import sdl_display
import sdl_pointer
import lvgl as lv

bus = lcd_bus.SDLBus(flags=lcd_bus.SDLBus.WINDOW_BORDERLESS)

buf = bus.allocate_framebuffer(768000, 0)

display = sdl_display.SDLDisplay(
    data_bus=bus,
    frame_buffer1=buf,
    display_width=800,
    display_height=480,
    color_space=lv.COLOR_FORMAT.RGB565
)

display.init()
pointer = sdl_pointer.SDLPointer()

# code for GUI
import task_handler
task_handler.TaskHandler(5)

[mark-hoy]

I checked that SDL2 can bring up a window on my system with an example from stackoverflow.
(I needed to add #include "stdbool.h")
SDL2 example on OSX
The following brings up a blank window when run
Mark-Hoys-Mini:sdl2 mark_hoy$ gcc -v main.c -I/opt/homebrew/include -L/opt/homebrew/lib -lSDL2 -o main

[kdschlosser]

change this line...

bus = lcd_bus.SDLBus(flags=lcd_bus.SDLBus.WINDOW_BORDERLESS)

to this

bus = lcd_bus.SDLBus(flags=0)

[mark-hoy]

Still no window showing up with
bus = lcd_bus.SDLBus(flags=0)

[kdschlosser]

also what I want you to do is download the attached file and put it into your build folder. remove the .txt extension from the end of it and then run micropython again. It should spew out a slew of messages.

task_handler.py.txt

[kdschlosser]

I don't think the callback is being made. SDL is not going to create the window until the events are pumped

[mark-hoy]

There is no extra output with the task_handler.py in place. Neither the task handler, nor the timer print.

[kdschlosser]

ok so the callback I don't think is getting called.

I am going to add some more simple debugging print statements so we can see what is happening.

[kdschlosser]

OK I updated the repo.

[mark-hoy]

Removed directory, git clone'd, built with executable, copied in test.py with
bus = lcd_bus.SDLBus(flags=0)

There is output!

Mark-Hoys-Mini:app mark_hoy$ vi test.py 
Mark-Hoys-Mini:app mark_hoy$ ../build/lvgl_micropy_macos 
LVGL MicroPython 1.23.0 on 2024-09-26; darwin [GCC 4.2.1] version
Use Ctrl-D to exit, Ctrl-E for paste mode
>>> import test
machine_timer_make_new
machine_timer_make_new m_new_obj
machine_timer_init_helper
machine_timer_disable
machine_timer_enable
machine_timer_init
machine_timer_init_helper
machine_timer_disable
machine_timer_disable dispatch_source_cancel
machine_timer_enable
>>> 

[kdschlosser]

You are going to have to give me a bit to write the code to use SDL

[kdschlosser]

OK I just finished it up if you want to give it a try. If it works I am going to use it for both the linux and the macos ports.

[mark-hoy]

Build error

CC build-standard/lv_mpy.c
CC /Users/mark_hoy/git/lvgl_micropython/lib/lvgl/src/misc/lv_utils.c
CC /Users/mark_hoy/git/lvgl_micropython/lib/lvgl/src/misc/lv_text_ap.c
CC /Users/mark_hoy/git/lvgl_micropython/lib/lvgl/src/misc/lv_text.c
/Users/mark_hoy/git/lvgl_micropython/ext_mod/lcd_bus/sdl_bus/sdl_bus.c:44:5: error: non-void function does not return a value [-Werror,-Wreturn-type]
}
^
/Users/mark_hoy/git/lvgl_micropython/ext_mod/lcd_bus/sdl_bus/sdl_bus.c:231:39: error: assigning to 'mp_obj_t' (aka 'void *') from incompatible type 'const mp_obj_fun_builtin_fixed_t' (aka 'const struct _mp_obj_fun_builtin_fixed_t')
MP_STATE_VM(sys_exitfunc) = quit_sdl_obj;
^ ~~~~~~~~~~~~
-e See https://github.com/micropython/micropython/wiki/Build-Troubleshooting
2 errors generated.
make: *** [build-standard/lcd_bus/sdl_bus/sdl_bus.o] Error 1
make: *** Waiting for unfinished jobs....

[mark-hoy]

I'm heading to bed, I'm near San Diego in the PST time zone.

[mark-hoy]

well I just found out that was a complete waste of time. Dispatch doesn't run for shell applications. There is no callback timer available for a shell app running C code on macos. have to roll your own using pthread. How fucked is that!!!!

How did you figure that out?

[mark-hoy]

Here are snippets of the sdl_bus.c file so the errors are easier to determine.

$ cat -n ext_mod/lcd_bus/sdl_bus/sdl_bus.c|less
.
.
.
    37      int process_event(mp_lcd_sdl_bus_obj_t *self, SDL_Event *event);
    38  
    39      static mp_obj_t quit_sdl(void) {
    40          SDL_QuitSubSystem(SDL_INIT_GAMECONTROLLER);
    41          SDL_QuitSubSystem(SDL_INIT_JOYSTICK);
    42          SDL_QuitSubSystem(SDL_INIT_EVENTS);
    43          SDL_QuitSubSystem(SDL_INIT_TIMER);
    44      }
    45  
    46      static MP_DEFINE_CONST_FUN_OBJ_0(quit_sdl_obj, quit_sdl);
    47  


   221      static mp_obj_t mp_lcd_sdl_poll_events(mp_obj_t self_in)
   222      {
   223          LCD_UNUSED(self_in);
   224          //mp_printf(&mp_plat_print, "mp_lcd_sdl_poll_events\n");
   225          if (!sdl_inited) {
   226              SDL_InitSubSystem(SDL_INIT_GAMECONTROLLER);
   227              SDL_InitSubSystem(SDL_INIT_JOYSTICK);
   228              SDL_InitSubSystem(SDL_INIT_EVENTS);
   229              SDL_InitSubSystem(SDL_INIT_TIMER);
   230  
   231              MP_STATE_VM(sys_exitfunc) = quit_sdl_obj;
   232  
   233              sdl_inited = true;
   234          }
   235  

[kdschlosser]

OH snap. I forgot to mention that I updated the repo.

[mark-hoy]

Something simple got broken in this one with lots of build errors, it looks like the include file mpconfigvariant_common.h has a trailing '8'.

build7.txt

Mark-Hoys-Mini:lvgl_micropython mark_hoy$ tail ./lib/micropython/ports/unix/variants/mpconfigvariant_common.h
// Enable the "websocket" module.
#define MICROPY_PY_WEBSOCKET           (1)

// Enable the "machine" module, mostly for machine.mem*.
#define MICROPY_PY_MACHINE             (1)
#define MICROPY_PY_MACHINE_PULSE       (1)
#define MICROPY_PY_MACHINE_PIN_BASE    (1)


8

[mark-hoy]

I don't see anything wrong in https://github.com/micropython/micropython/blob/a61c446c0b34e82aeb54b9770250d267656f2b7f/ports/unix/variants/mpconfigvariant_common.h
I'm guessing something edits it on the fly.

[mark-hoy]

Any ideas?