shitcreek

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 [A<mm>] [B<mm>] [C<mm>] [E<mm>] [F<feedrate>] [I<current>] [J<0|1|2|3|4|5|6|7>] [K<Kvalue>] [T<current>] [U<mm>] [V<mm>] [W<mm>] [X<mm>] [Y<mm>] [Z<mm>]

Parameters

[A<mm>]
2.0.9
I_DRIVER_TYPE AXIS4_NAME 'A'

Monitor A with the given displacement (1 - 255mm) on either side of the current position.
    [B<mm>]
    2.0.9
    J_DRIVER_TYPE AXIS5_NAME 'B'

    Monitor B with the given displacement (1 - 255mm) on either side of the current position.
      [C<mm>]
      2.0.9
      K_DRIVER_TYPE AXIS6_NAME 'C'

      Monitor C with the given displacement (1 - 255mm) on either side of the current position.
        [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.
                  [U<mm>]
                  2.1
                  U_DRIVER_TYPE AXIS7_NAME 'U'

                  Monitor U with the given displacement (1 - 255mm) on either side of the current position.
                    [V<mm>]
                    2.1
                    V_DRIVER_TYPE AXIS8_NAME 'V'

                    Monitor V with the given displacement (1 - 255mm) on either side of the current position.
                      [W<mm>]
                      2.1
                      W_DRIVER_TYPE AXIS9_NAME 'W'

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