This configuration has worked for me, but you may want to make further tweaks. It's worth comparing the diff of the jn-ender3_skr branch against the 2.1.2 release in case there's a configuration you'd like to tweak. If this is the exact configuration you'd like to use, the attached firmware.bin was compiled with these settings.
Summary of changes:
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Enabled support for BLTouch/CR Touch.
- Configured probe offset for CR Touch.
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Enabled Unified Bed Leveling.
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Updating probing and mesh margins for default Ender 3 glass clips.
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Enabling Probe Offset Wizard.
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Configured USB serial for use with OctoPrint.
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Calibrated hot end and bed PID.
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Updated min/max temps and bed size for the Ender-3.
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Tweaks to use the correct stepper motor inversion on each axis.
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Enabled Jerk.
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Enabled linear advance.
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Enabled EEPROM support.
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Enabled SD card support.
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Fan 1 is the part fan that turns on when the hot end is over 160C.
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Fan 2 is configured as the controller fan to cool the board. It turns to when the stepper motors engage.
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Configured TMC2209 driver type and enabled TMC debug data.