add prusa rambo

[bgiot]

Add support for building prusa firmwares

[bgiot]

@ivankravets @valeros @rafacouto @johnduhart any news ?

[ivankravets]

Thanks for the PR! We need the next files:

• Libraries -> https://github.com/platformio/platformio-pkg-framework-arduinoavr/tree/master/libraries/__cores__
• Variant -> https://github.com/platformio/platformio-pkg-framework-arduinoavr/tree/master/variants

[bgiot]

As defined in the prusa_rambo.json (see PR platformio/platform-atmelavr#163), we use the default variant for rambo, and the existing arduino cores. is it an issue ?

[ivankravets]

I see, what to do with libraries? Where is the source code of this core?

[bgiot]

Sorry, I don't think I understand your question... when building the Prusa Firmware, I use this:
platform = atmelavr
board = prusa_rambo
framework = arduino
You can check my platformio.ini at https://github.com/bgiot/Prusa-Firmware/blob/BMGCustom/platformio.ini

[ivankravets]

Where did get source code for this prusa_rambo core?

[bgiot]

from Prusa github: https://github.com/prusa3d/Arduino_Boards
The only modification from reprap_rambo is in the wiring.c file I think.

[bgiot]

Maybe I can explain the all story, so you understand why my PR.
Up to version 3.7.x of the Prusa 3D printer firmware, I was able to compile it with platform.io with the following config:
platform = atmelavr
board = reprap_rambo
framework = arduino
With the up-coming 3.8 versions, there is an issue because Prusa has modified one of the TIMER0, and we have a conflict with the one defined by arduino core.
so I did the minimal changes in platform.io packages/platforms to be able to compile the new firmware. This implies a new board definition and a new 'core' that I called 'prusa_rambo'.

[bgiot]

Thank you. Will test.

[bgiot]

Successful test with platform upstream (https://github.com/platformio/platform-atmelavr.git)