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docs: Expand FAQ on why step_distance is used 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2019-01-27 11:29:42 -05:00
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docs/FAQ.md
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@ -38,6 +38,14 @@ each motor driver pulse. It can also be calculated from the axis
pitch, motor step angle, and driver microstepping. If unsure, do a web
search for "calculate steps per mm" to find an online calculator.
Klipper uses step_distance instead of steps_per_mm in order to use
consistent units of measurement in the config file. (The config uses
millimeters for all distance measurements.) It is believed that
steps_per_mm originates from a micro-optimization on old 8-bit
micro-controllers (the desire to use a multiply instead of a divide in
some low-level code). Continuing to configure this one distance in
units of "inverse millimeters" is felt to be quirky and unnecessary.
### Where's my serial port?
The general way to find a USB serial port is to run `ls -l