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M917 - L6474 Overcurrent Warning Test

L6474 Find L6474 minimum current thresholds MONITOR_L6470_DRIVER_STATUS
Related codes: M916 M918

Description

The M917 command runs a test procedure to find the minimum stepper current thresholds.

  • Decrease OCD current until overcurrent error
  • Increase OCD until overcurrent error goes away
  • Decrease stall threshold until stall (not done on L6474)
  • Increase stall until stall error goes away (not done on L6474)

Notes

Requires MONITOR_L6470_DRIVER_STATUS.

All tests assume each axis uses matching driver chips.

Usage

M917 [E<mm>] [F<feedrate>] [I<current>] [J<0|1|2|3|4|5|6|7>] [K<Kvalue>] [T<current>] [X<mm>] [Y<mm>] [Z<mm>]

Parameters

[E<mm>]

Monitor E with the given displacement (1 - 255mm) on either side of the current position.
[F<feedrate>]

Feedrate for the moves. If unspecified, uses the max feedrate.
[I<current>]

Starting overcurrent threshold. Report current value from driver if not specified. If there are multiple drivers on the axis then all will be set the same.
[J<0|1|2|3|4|5|6|7>]

Select which driver(s) to monitor on multi-driver axis.

  • J0:

    (default) Monitor all drivers on the axis or E0.

  • J1:

    Monitor only X, Y, Z, E1.

  • J2:

    Monitor only X2, Y2, Z2, E2.

  • J3:

    Monitor only Z3, E3

  • J4:

    Monitor only Z4, E4

  • J5:

    Monitor only Z5, E5

  • J6:

    Monitor only Z6, E6

  • J7:

    Monitor only Z7, E7
[K<Kvalue>]

Value for KVAL_HOLD (0 - 255) (ignored for L6474). Report current value from driver if not specified
[T<current>]

Current (mA) setting for TVAL (0 - 4A in 31.25mA increments, rounds down) - L6474 only. Report current value from driver if not specified.
[X<mm>]

Monitor X with the given displacement (1 - 255mm) on either side of the current position.
[Y<mm>]

Monitor Y with the given displacement (1 - 255mm) on either side of the current position.
[Z<mm>]

Monitor Z with the given displacement (1 - 255mm) on either side of the current position.