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tmc: Track requested hold_current so SET_TMC_CURRENT doesn't reduce it

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The code automatically reduces the hold_current so that it is no
greater than the run_current.  However, this could lead to confusing
behavior if one reduced and then increased the run_current via
SET_TMC_CURRENT commands.  To avoid that, this change adds support for
tracking the requested hold_current - thus changes to run_current
don't subtly alter the hold_current.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2021-10-24 20:03:42 -04:00
parent 627c1c5d2a
commit 86fee2d517
5 changed files with 20 additions and 17 deletions
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4
docs/Config_Reference.md
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@@ -2760,8 +2760,8 @@ run_current:
# during stepper movement. This parameter must be provided.
#hold_current:
# The amount of current (in amps RMS) to configure the driver to use
# when the stepper is not moving. The default is to use the same
# value as run_current.
# when the stepper is not moving. The default is to not reduce the
# current.
#sense_resistor: 0.110
# The resistance (in ohms) of the motor sense resistor. The default
# is 0.110 ohms.