Understanding Marlin so I can port it CH32V307

[ali_asadzadeh]

Hi,
I'm interested in understanding marlin software structure and I'm eager to port it to CH32V307 part,
I want to first try it out on a stm32 blue pill and then port it to the new arch, since it's a complex software, I have modified  it for STM32F103CB part

I have changed the platformio.ini file  default_envs = STM32F103CB_malyan also I have copied the Configuration.h and Configuration_adv.h from Configurations
 repo Malyan/M200 folder to marlin folder,

The next step is to remove compiler optimization so the code can be debugged with ease, so I have edited  line number  798 in the main makefile

from

OPT = s

to

OPT = 0

And I expected the output flash size to change, But noting would change, so Where should I change to remove the compiler optimization,

You can take a look at makefile in the attachment

[ali_asadzadeh]

Merry christmas  , is there a nata gift for me? do you know how to remove compiler optimization?

[martinribelotta]

Merry christmas  , is there a nata gift for me? do you know how to remove compiler optimization?

Try to use

Code: [Select]

OPT = g
This enable some optimizations but maintain the final executable reasonably near to the source code.

And happy new year for you!

[ali_asadzadeh]

Thanks martinribelotta and happy new year, This is the output size when the OPT = s

Advanced Memory Usage is available via "PlatformIO Home > Project Inspect"
RAM:   [====      ]  43.7% (used 8956 bytes from 20480 bytes)
Flash: [========  ]  81.1% (used 99684 bytes from 122880 bytes)

and this is the output when the OPT = g

Advanced Memory Usage is available via "PlatformIO Home > Project Inspect"
RAM:   [====      ]  43.7% (used 8956 bytes from 20480 bytes)
Flash: [========  ]  81.1% (used 99684 bytes from 122880 bytes)

Exactly the same, I think there might be some other flags somewhere else And I can not figure it out?
this is the marlin github repo
https://github.com/MarlinFirmware/Marlin

[westfw]

This is the output size when the OPT = s
    :
and this is the output when the OPT = g
    :
Exactly the same,

Did you do a "Make Clean" or equivalent in between?  Dependency calculations usually don't take into account changes in the Makefile. so it might have just re-linked all the existing .o files from the previous build.

[ali_asadzadeh]

Did you do a "Make Clean" or equivalent in between?  Dependency calculations usually don't take into account changes in the Makefile. so it might have just re-linked all the existing .o files from the previous build.

Absolutely, and it does not change the output flash or ram size

[DavidAlfa]

If flash usage is already 81% with Os... O0 won't fit by any means!

However you can selectively disable optimization with gcc attributes.
For example:

Code: [Select]

__attribute__((optimize("O0"))) void do_something()
{
    // This is not optimized
}


[ali_asadzadeh]

Thanks David, Do you have any experience with marlin firmware? it's so complicated that doing __attribute__((optimize("O0"))) would not help.

[DavidAlfa]

You only need to port the lower level functions, those interfacing the hardware.
Marlin has several HAL libraries for the different MCUs, see here:
https://github.com/MarlinFirmware/Marlin/tree/bugfix-2.1.x/Marlin/src/HAL

That's what you need to work on.