[Q] Sporadic serial data loss / M1 command behavior

[FrankBoesing]

Hi everyone,

I’ve noticed that sometimes incoming serial data seems to get lost or misinterpreted. From what I can tell, the RX IDLE line interrupt is currently disabled (IDLE_LINE_IT = false), which might explain some occasional timing issues in the DMA ring buffer. This can cause M1xx commands to show unexpected “M1” responses when the buffer isn’t perfectly in sync - which would be quit normal with DMA writing.

Is there a particular reason the interrupt is disabled? Could re-enabling it help improve reliability? Also, I’m curious why M1 commands get special treatment for RepRap (not Marlin) only —any insights would be great!

Thanks for your help!

[github-actions]

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