Marlin on Arduino Uno

Hello everybody!
I have a big problem with serial comunication. If I upload a modified version of Marlin on Arduino Mega, serial comunication work correctly. But if I upload the same one on Arduino Uno, the microcontroller doesn't respond correctly: I can only see the first response and after the serial tx crashes. Why?
In the attachment there is the modified version of Marlin. This version is much lighter than the original (under 32kB ).

Edited 1 time(s). Last edit at 06/25/2015 09:25AM by calogerom.

It's probably running out of RAM. The Uno has only 2Kb, the Mega has 8Kb AFAIR.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Are serial commands stored in RAM?

Quote
calogerom
Are serial commands stored in RAM?

Effectively, yes. In particular, there is a queue of pending moves, so that the printer can do lookahead. I don;t know whether you can reduce the RAM requirement enough by making the queue shorter. You might be better off using a more lightweight firmware such as Teacup.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].