cprezzi
commented
3 years ago Th best location to get help with this would probably be the maker forums: https://forum.makerforums.info/c/controllers/grbl-lpc/112
For your question: Yes, the software pull-up control was never ported (because most boards have hardware pull-ups, like SBASE v1.3 has).
Primer-Merc
I don't know where to ask this question, so please let me apologize if this is the wrong forum for questions.
I have a modified SBASE v1.3 with resistors R33,R34,R35,R39,R40,R41 removed. This was done to accommodate the use of PNP proximity switches. ( Page 4 of this document if you need reference) https://github.com/makerbase-mks/MKS-SBASE/blob/master/Hardware/MKS%20SBASE%20V1.3_002/MKS%20SBASE%20V1.3_002%20SCH.pdf
Switches are wired as normally closed. And pins are receiving 5V when not actuated. When configured with the following settings in Smoothie, the limit switches act as expected.
alpha_min_endstop 1.24v! alpha_max_endstop 1.25v! beta_min_endstop 1.27v!
beta_max_endstop 1.26v! gamma_max_endstop 1.29v! gamma_homing_direction home_to_max
My question is.......... Is this note in the config.h still valid?
//#define DISABLE_LIMIT_PIN_PULL_UP Don't use; pull-up control not ported to ARM yet. pull-up is always on.
//#define DISABLE_PROBE_PIN_PULL_UP Don't use; pull-up control not ported to ARM yet. pull-up is always on.
//#define DISABLE_CONTROL_PIN_PULL_UP Don't use; pull-up control not ported to ARM yet. pull-up is always on.
Will I be unable to to use grbl-LPC because I cannot tell the SOC to pull the pin to ground?
Please forgive my ignorance if this seems rather easy. I'm old and still learning at a turtles pace. My intention to change to grbl-LPC is solely based on the ability to have a live feed hold. Smoothie can't do feed holds with any reliability, and that's no good for a CNC router.
Thanks,
Kyle