[gnea/grbl-Mega Issue#150] G38.2 not working anymore (was working in 0.9) About GRBL HAL

Issue #150 | 状态: 已关闭 | 作者: McNugget6750 | 创建时间: 2022-01-03

I’m running latest grbl-mega 1.1g on a PCB mill using a Mega256 on a RAMPS1.4 board.
I have endstop switches for XYZ which report fine:

The MAX-Z endstop is new and works during homing as expected: I lift to max, then to X and Y homing together.

I want to use MIN-Z to probe autolevel my PCB which was working using a simple
G38.2 Z-10 F10
before.
However, no matter what I set for $6=0/$6=1 I always get an ALARM:4 or ALARM:5

I measured the pins of my crocodile leads to the PCB and they show the 5V pullup I’m expecting and 0V when I short the pins on the PCB (as expected). GRBL then reports:

I assume, that’s also to be expected as a Z switch was triggered.

However, after homing, I set my machine to X5Y5 and run
G38.2 Z-10 F10
which is immediately killed with ALARM:4

Any idea why this is not working anymore:
!image

#1 – McNugget6750 于 2022-01-03

Using $6=0, the probe moves in the right direction (down), however, it does not react to any pin change on MIN-Z – even though, as stated above, GRBL understands my probing pin.

#2 – fra589 于 2022-01-04

Hi @McNugget6750

As we can see in cpu_map.h (line 252 to 257), the probe have his own pin to work:
“// Define probe switch input pin. #define PROBE_DDR DDRK #define PROBE_PIN PINK #define PROBE_PORT PORTK #define PROBE_BIT 7 // MEGA2560 Analog Pin 15 #define PROBEMASK (1<BIT)

`The proble pin input state is reported in thePn: field of the ?reply. The probe result is send by Grbl immediately at the end of probing, the last probe can be retrieved in the reply of the$#` command (see https://github.com/gnea/grbl/wiki/Grbl-v1.1-Interface).

@++;
Gauthier.

#3 – McNugget6750 于 2022-01-04

Thank you Gauthier!
I did miss that during my transition from 0.9 to 1.1… Thank you for pointing this out. I soldered a new pin and it reports properly now. I used the default pin A15 aka PORTK7.

原始Issue: https://github.com/gnea/grbl-Mega/issues/150

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