Enable platformio support.

[positron96]

This PR adds a simple platform.io file that builds a file for Arduino Uno. Its output exactly matches what Arduino IDE creates.

Having platformio file in this repo allows developers to use "normal" IDEs with autocomplete, refactoring and stuff, while maintaining Arduino compatibility. It also will allow easy autobuilding of release builds with CI/CD pipelines (with pio CLI).

Full compatibility with Arduino IDE is retained (it still works)

[ooxi]

While not opposed to the PR, I don't really see a benefit, since a Makefile is already present? Moreover, those commits should be squashed before creating a PR.

[positron96]

I'll squash the commits in the nearest future.
Anyway, could you elaborate more on Makefiles? It makes no difference for PIO users since PlatformIO uses its own build system (in a way, PIO is a build system)

[avion23]

This MR would help me tremendously.

I can see that there is already a make-system. But platformio is the one build system to rule them all and supports all kinds of flashers and bootloaders.

[dsiguero]

What's the rationale for not merging this?

[rob-deutsch]

I would also like to see this merged. PlatformIO is a wonderful build system which makes it much easier to get up and running with GRBL.

[NuwanJ]

Agree with you @rob-deutsch. Having a Makefile is ok. But platformio.ini is more than a build config file, which allows to compile/build GRBL with VS Code + Platform IO easily.

[mydani]

One more voting for the merge of this PR - platformio is status-quo for sophisticated development.

[tcurdt]

As an open source maintainer myself tickets like this make me sad...

$ make
avr-gcc -Wall -Os -DF_CPU=16000000 -mmcu=atmega328p -I. -ffunction-sections -flto -MMD -MP -c grbl/main.c -o build/main.o
make: avr-gcc: No such file or directory
make: *** [build/main.o] Error 1

# of course you need to install the deps first!
# but which?
$ brew search avr-gcc
# hmmmm

$ pio run
Processing uno (platform: atmelavr; board: uno; framework: arduino)
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/atmelavr/uno.html
PLATFORM: Atmel AVR (3.4.0) > Arduino Uno
HARDWARE: ATMEGA328P 16MHz, 2KB RAM, 31.50KB Flash
DEBUG: Current (avr-stub) On-board (avr-stub, simavr)
PACKAGES:
 - framework-arduino-avr @ 5.1.0
 - toolchain-atmelavr @ 1.70300.191015 (7.3.0)
LDF: Library Dependency Finder -> https://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 5 compatible libraries
Scanning dependencies...
No dependencies
Building in release mode
Compiling .pio/build/uno/src/coolant_control.c.o
Compiling .pio/build/uno/src/eeprom.c.o
Compiling .pio/build/uno/src/gcode.c.o
...
Archiving .pio/build/uno/libFrameworkArduino.a
Indexing .pio/build/uno/libFrameworkArduino.a
Linking .pio/build/uno/firmware.elf
Checking size .pio/build/uno/firmware.elf
Advanced Memory Usage is available via "PlatformIO Home > Project Inspect"
RAM:   [========  ]  79.7% (used 1633 bytes from 2048 bytes)
Flash: [========= ]  92.2% (used 29738 bytes from 32256 bytes)
Building .pio/build/uno/firmware.hex

5 years - FIVE years.

Thanks for the PR @positron96

[rob-deutsch]

Is GRBL being actively maintained? I suspect not.

[mar0x]

@tcurdt, it depends on environment and backgound:

% pio run                                                                                                              
zsh: command not found: pio
% brew search pio
# hmmmm

% arduino-cli -v compile -b arduino:avr:uno --libraries . --build-path .build --warnings all grbl/examples/grblUpload
...
Sketch uses 29738 bytes (92%) of program storage space. Maximum is 32256 bytes.
Global variables use 1633 bytes (79%) of dynamic memory, leaving 415 bytes for local variables. Maximum is 2048 bytes.

Used library Version Path
grbl                 ...../grbl/grbl

Used platform Version Path
arduino:avr   1.8.6   ...../Library/Arduino15/packages/arduino/hardware/avr/1.8.6