config: define laser pins for Mega P #222
Merged
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Description
This PR defines laser pins for the Mega Pro. The laser reuses the Header 0 pin.
Benefits
It is possible to use the builtin Marlin M3 - Spindle CW / Laser On command with the laser module attached.
cave: There is no sanity check in the FW, so using M3 without the laser module just puts the PWM values on the the heater.
Configurations
Just build any MEGA_P* target.
Related Issues
This does not enable the Anycubic TFT laser features (Bitmap printing), but it's definitely related to #49