Block homing with certain control switches

[bdring]

Door, Hold, E-Stop and fault control switches block homing.

[bdring]

Here is some test data.

Door Switch

Door switch on startup reports alarm

Grbl 3.9 [FluidNC v3.9.2-pre2 (Block_Homing_with_control_switches-7b56b8fd-dirty) (wifi) '$' for help]
[MSG:ERR: safety_door_pin is active at startup]
[MSG:INFO: ALARM: Control Pin Initially On]
ALARM:11
<Alarm|MPos:0.000,0.000,0.000|FS:0,0|Pn:D|WCO:0.000,0.000,0.000>

$X and $H do nothing until door is deactivated. CTRL+X does a hard reset, but returns to the same mode.

Deactivating leaves you in Alarm mode. $X and $H work. CTRL+X does a hard reset without changing the mode

Hold Switch

Hold switch on startup reports alarm

Grbl 3.9 [FluidNC v3.9.2-pre2 (Block_Homing_with_control_switches-7b56b8fd-dirty) (wifi) '$' for help]
[MSG:ERR: feed_hold_pin is active at startup]
[MSG:INFO: ALARM: Control Pin Initially On]
ALARM:11
<Alarm|MPos:0.000,0.000,0.000|FS:0,0|Pn:H|WCO:0.000,0.000,0.000>

$X does nothing. $H will home and leave you in Idle state. CTRL+X does a hard reset without changing the mode

Fault and E-Stop

Switch on startup reports alarm

Grbl 3.9 [FluidNC v3.9.2-pre2 (Block_Homing_with_control_switches-7b56b8fd-dirty) (wifi) '$' for help]
[MSG:ERR: fault_pin is active at startup]
[MSG:INFO: ALARM: Control Pin Initially On]
ALARM:11
[MSG:INFO: Control pins:F]
<Alarm|MPos:0.000,0.000,0.000|FS:0,0|Pn:H|WCO:0.000,0.000,0.000>

$X and $H do nothing until door is deactivated. CTRL+X does a hard reset, but returns to the same mode.

Deactivating leaves you in Alarm mode. $X and $H work. CTRL+X does a hard reset without changing the mode

Combo of Door and Fault

Works as intended

Combo of Hold and Fault

Works as intended.

Wiki Note to add:

Standard Grbl only supports Door, Reset, Feed Hold and Cycle start pins. If you use the other inputs, Grbl gcode senders will probably not be very helpful with the reporting or use of these inputs.