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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.