[BUG] FW 1.5.2 for i3 MEGA 1G: Z-Endstop is not working (has no power)

[SirMike3D]

Bug Description

After flashing the FW (MEGA_1G_TMC_v1.5.2.hex) there is no more constant 5V at the one limit switch of the Z-axis.
Out of this reason, the Z-Endstop is ignored for homing G28 Z0.

More details can be found here:
https://forum.drucktipps3d.de/forum/thread/32942-i3-mega-nach-fw-update-knutwurst-1-5-2-wird-z-endstop-nicht-erkannt-bzw-funktion/

Steps to Reproduce

1. flash FW, load FW defaults, save EEPROM
2. start printing (or G28 Z0)
3. press limit switch
4. Used M119 for testing -> No reaction from Z-Switch, not even when triggered

Expected behavior:

G28 Z0: Z axis homing, gantry stopps at endstop position for the Z-axis.

Actual behavior:

G28 Z0: Z axis homing, Z-switch (endstop) is not working, -> gantry moves down till "crash" and destroyed limit switch

Additional Information

Tested with other FW, the Z-axis switch is powerd with 5V and homing works correct, so no defect of the Trigorilla MB or broken cable, switch, connectors. Maybe the used Atmega software output channel is set/addressed not correct.
More details of the issue can be found here:
https://forum.drucktipps3d.de/forum/thread/32942-i3-mega-nach-fw-update-knutwurst-1-5-2-wird-z-endstop-nicht-erkannt-bzw-funktion/

BR Mike

[SirMike3D]

#529: fix worked. Updated the i3Mega 1G with the updated FW and the z endstop works normal.

Thanks for your support guys!

[SirMike3D]

Used M119 for testing -> Reaction from Z-Switch, pronta shows TRIGGERED when its triggered