Prevent MAIN.PY Running if BOOT.PY Aborts

[DS256]

I've tried using sys.exit(1) from BOOT.PY but MAIN.PY still runs. I've looked at the 'machine' library but didn't find any 'stop' type function. Any suggestions or will MAIN.PY always run.

Thanks

[robert-hh]

You could try to raise an exception in boot.py.

[th3w]

but doesn't sys.exit() already do that?
STATIC mp_obj_t mp_sys_exit(size_t n_args, const mp_obj_t *args) {
if (n_args == 0) {
mp_raise_type(&mp_type_SystemExit);

[DS256]

Isn't that a 'C' example? I'm using micropython

[robert-hh]

Looking through the code, it seems that main.py is only skipped of there was force to soft reset in boot.py,like having Ctrl-D in a input stream. Error in the code do not stop it. Maybe the initial PR which introduced it was wrong.

[th3w]

It's part of the micropython core, where the method sys.exit() is handled (within /py/modsys.c)

[DS256]

Ok, so it sounds like there is nothing in micropython/RPI Pico to handle this.

My fall back is for BOOT and MAIN to "create/check for" a CRASH.TXT file as a signal that an unrecoverable problem has occurred and requires manual intervention.

[robert-hh]

boot.py and main.py share the same global namespace. So it should be possible to just set a variable in boot.py which is checked in main.py

[DS256]

Brilliant. That works. Thanks