33 lines
1.5 KiB
Markdown
33 lines
1.5 KiB
Markdown
---
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tag: m0108
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title: Break and Continue
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brief: Break out of the current waiting loop
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author: thinkyhead
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group: control
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codes: [ M108 ]
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notes:
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- |
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With both `EMERGENCY_PARSER` and `HOST_KEEPALIVE_FEATURE` enabled, hosts will be able to prompt for continuation or cancellation, confirming with [`M108`](/docs/gcode/M108.html) and cancelling with [`M112`](/docs/gcode/M112.html).
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parameters:
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example:
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-
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pre: Use [`M108`](/docs/gcode/M108.html) as a "Continue" button in your host software.
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code:
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- M0 You're up, mate ; in your G-code file
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- M108 ; as your "Continue" button
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---
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The [`M108`](/docs/gcode/M108.html) command requires `EMERGENCY_PARSER` for full effectiveness. (Otherwise a full queue blocks the parser.)
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Some G-code commands cause Marlin to go into a closed loop, waiting indefinitely for a certain state or event. For example, [`M109`](/docs/gcode/M109.html) waits for the target temperature to be reached, and [`M0`](/docs/gcode/M000-M001.html) waits for an LCD click.
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In the case of [`M109`](/docs/gcode/M109.html), the [`M108`](/docs/gcode/M108.html) command stops waiting for the target temperature and continues processing G-code. This may result in "cold extrude" messages. For a full stop use [`M112`](/docs/gcode/M112.html).
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In the case of [`M0`](/docs/gcode/M000-M001.html) the [`M108`](/docs/gcode/M108.html) command acts like the LCD button, breaking out of [`M0`](/docs/gcode/M000-M001.html) and continuing to process the G-code queue.
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