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stepper: Support step_pulse_duration even on TMC drivers in UART/SPI mode

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Commit 689231df changed the default step_pulse_duration to 100ns for
TMC drivers that are configured in UART/SPI mode, but it failed to
document that change in Config_Changes.md and Config_Reference.md.
Update those documents to reflect that change.

Update the code so that a user may specify a custom
step_pulse_duration even on TMC drivers that are configured in
UART/SPI mode.  This may be useful for drivers that use a level
shifter on the step pin that requires more than a ~300ns to detect a
level change.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2021-11-29 16:41:48 -05:00
parent 54acca37ba
commit 520273e5ab
3 changed files with 11 additions and 5 deletions
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4
docs/Config_Reference.md
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@@ -157,7 +157,9 @@ microsteps:
# The minimum time between the step pulse signal edge and the
# following "unstep" signal edge. This is also used to set the
# minimum time between a step pulse and a direction change signal.
# The default is 0.000002 (which is 2us).
# The default is 0.000000100 (100ns) for TMC steppers that are
# configured in UART or SPI mode, and the default is 0.000002 (which
# is 2us) for all other steppers.
endstop_pin:
# Endstop switch detection pin. If this endstop pin is on a
# different mcu than the stepper motor then it enables "multi-mcu