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Clarify that 80K/Thumb2 code size includes compiler/REPL.

Paul Sokolovsky 2017-12-11 09:54:27 +02:00
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FAQ.md

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**How big is MicroPython? How much memory does it take?**
> You can see sizes of various configurations (as well as how they change over time) at http://micropython.org/resources/code-dashboard/ . Generally, we keep minimal configuration of MicroPython under 80K of ARM Thumb2 code. That means Cortex-M microcontroller with 128KB of flash can host a minimal version together with some hardware drivers. More full-fledged configurations take more space, for example "stmhal" (advanced microcontroller support) and "unix" (desktop-capable) ports are around 280KB.
> You can see sizes of various configurations (as well as how they change over time) at http://micropython.org/resources/code-dashboard/ . Generally, we keep minimal configuration of MicroPython under 80K of ARM Thumb2 code (which includes compiler and interactive prompt, much less size can be achieved disabling those). That means a Cortex-M microcontroller with 128KB of flash can host a minimal version together with some hardware drivers. More full-fledged configurations take more space, for example "stmhal" (advanced microcontroller support) and "unix" (desktop-capable) ports are around 280KB.
> Regarding RAM usage, MicroPython can *start up* with 2KB of heap. Adding stack and required static memory, a 4KB microcontroller could start a MicroPython, but hardly could go further than interpreting simple expressions. Thus, 8KB is minimal amount to run simple scripts. As Python is interpreted high-level language, the more memory you have, the more capable applications you can run. The reference MicroPython board, PyBoard, has 128KB of RAM.