Jump to content
Ultimaker Community of 3D Printing Experts

Communicating via USB while printing from SD?


derbroti
 Share

Recommended Posts

Posted · Communicating via USB while printing from SD?

Hi,

the topic basically says all: Is it possible (honestly not tried yet...) or better asked can it lead to problems (too much traffic for the little atmega to handle?) when I try to send gcode commands via USB during a print from the SD card? (Of course no movement commands just status requests)

Cheers,

derbroti

  • Link to post
    Share on other sites

    Posted (edited) · Communicating via USB while printing from SD?

    Ok, I read through the marlin firmware and the result (if I got it right) is okay.

    The main loop first reads from serial in a loop until the buffer (8 commands) is full or no more serial communication happens and then from SD again in a loop until card EOF or buffer full.

    So, if I send too many commands fast enough, I could fill the buffer with serial commands (as they will be read first) and starve the SD communication and make my print fail...

    ...this should be unlikely because generally, when just occasionally sneak in a command it should work fine as the serial loop would stop and it can happily fill up the buffer with SD commands.

    Edited by Guest
  • Link to post
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now
     Share

    • Our picks

      • Ultimaker showcase | April 2022 | 4pm CEST | 10am EDT
        I'm excited because I've personally produced this showcase event, so if you are curious what else I'm up to nowadays, come check it out and say hi in the chat! It would mean a lot! 
          • Thanks
          • Like
        • 4 replies
      • New here? Get ahead with a free onboarding course
        Hi,
         
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 12 replies
    ×
    ×
    • Create New...