BTT SKR-PRO-V1.2 Auto Home & Level Bed problem

Marlin Firmware Service Bug Reports
1

On Anet A6 I installed BLtouchwith original ANET3D v1.5,
Marlin-2.0.x and “Auto Home” and “Level Bed” work great.

Unable to get “Auto Home” and “Level Bed” to work on SKR-PRO-V1.2.
X, Y, Z axis move in the right direction but displacement is not correct.
X 10mm moves 5mm.
Y and Z 10mm moves 1mm

But with each “Auto Home” command, the Z axis moves up about 2mm instead of down.
Ditto for the commands “Motion->Home X”, “Home Y”. which are correct.
But “Motion->Home Z” increases each time by about 2mm and with each new command increases again.
Command “Configuration-> Probe Z Offset”, (given negative), has no effect. Z Axis does not drop below zero.

“Level Bed” doesn’t work either.

Used :
Marlin-2.0.x
Marlin-2.1.x
Stepper driver TMC2208 Uart

Some Configuration.h commands:
#define MOTHERBOARD BOARD_BTT_SKR_PRO_V1_2
#define SERIAL_PORT -1
#define BAUDRATE 11520
#define X_DRIVER_TYPE TMC2208
#define Y_DRIVER_TYPE TMC2208
#define Z_DRIVER_TYPE TMC2208
#define X_MIN_ENDSTOP_INVERTING true
#define Y_MIN_ENDSTOP_INVERTING true
#define Z_MIN_PROBE_ENDSTOP_INVERTING false
#define USE_PROBE_FOR_Z_HOMING
#define BLTOUCH
#define MULTIPLE_PROBING 2
#define INVERT_X_DIR true
#define INVERT_Y_DIR true
#define INVERT_Z_DIR false
#define AUTO_BED_LEVELING_BILINEAR
#define Z_SAFE_HOMING
#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER

platformio.ini :
default_envs=BIGTREE_SKR_PRO

I tried to change so many things with no positive result.
What is wrong please ?

So impossible to use the SKR-PRO-V1.2 card to my great regret.
And I wanted to install and use 3 RGB colors in an extruder and 3 stepper motors.

Thank you, gg

2

Unable to get “Auto Home” and “Level Bed” to work on SKR-PRO-V1.2.

I looked it up in the sources.
I discover that it takes a multiplication factor for displacement
in X which is approx. 2.5. And another for Y, approx. 10 and for Z approx. 8.

I tested it in menu “menu_motion.cpp”
We see the factor for X which is 2.5

I don’t know where these multiplication factors are used,
if they are linked to the BTT card or maybe to the stepper drivers or elsewhere.

“menu_motion.cpp” :
else {
if (LARGE_AREA_TEST) SUBMENU(MSG_MOVE_100MM, []{ _goto_manual_move(100); });
SUBMENU(MSG_MOVE_10MM, []{ _goto_manual_move(10*2.5); });
SUBMENU(MSG_MOVE_1MM, []{ _goto_manual_move( 1); });
SUBMENU(MSG_MOVE_01MM, []{ _goto_manual_move( 0.1f); });
if (axis == Z_AXIS && (FINE_MANUAL_MOVE) > 0.0f && (FINE_MANUAL_MOVE) < 0.1f)
SUBMENU_f(F(STRINGIFY(FINE_MANUAL_MOVE)), MSG_MOVE_N_MM, []{ _goto_manual_move(float(FINE_MANUAL_MOVE)); });
}
END_MENU();
}

best regards, gg

3

Are you building from source yourself?

I don’t build any firmware for this board, so you might be better seeking help from the official Marlin support channels:

Marlin Support

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