AVR Port for Micropython

[keenanjohnson]

Hello community! I was wondering if anyone has worked on a micropython port for an AVR architecture?

I just received a AVR128DB48 board and I was thinking that it might be great to start working on a micropython port that could run on the board.

[robert-hh]

With 128k flash and 16k RAM this could be tricky. More than an absolute minimal system will not fit.

[keenanjohnson]

Ah I see and thanks. Are the recommended memory limits for micorpython documentated anywhere? - Keenan

…

On Fri, Sep 29, 2023 at 10:06 AM Robert Hammelrath ***@***.***> wrote: With 128k flash and 16k RAM this could be tricky. More than an absolute minimal system will not fit. — Reply to this email directly, view it on GitHub <#12550 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AATQ3FTLNZBBYOIG25SIES3X4352LANCNFSM6AAAAAA5MWUCDE> . You are receiving this because you authored the thread.Message ID: ***@***.*** com>

[rkompass]

The Microbit v1 board also has 16k RAM but 256k Flash, which together appears like a lower limit.
The Micropython compiler was modified to run with such tiny RAM, this is documented somewhere.
With a (Blackpill) STM32F401 with 64k RAM and 256k Flash standard Micropython runs fine.
With a (Bluepill) STM32F103 with 20k RAM and 64k Flash there only were unsuccessful attempts to port Micropython.

[robert-hh]

RAM is the critical limit. With 16 k RAM, reserving 4k for stack and 2k for static data, only 10k remain for the Python heap, which holds the compiled Python code & data.
One more example:
The SAMD21 have 256k flash and 32k RAM. Of the flash 192k are used for code, and 64 k for a small file system. From the RAM, ~22k are available for the heap at 8k stack size.