I am adding a high-frequency GPIO expander for my esp32 to control 8 extruders and need to know where the DIR and STP pins are written to in the firmware so I can intercept the data and inject custom code to write to the GPIO expander instead. This is for a custom multi-jet 3d printer.

Edited 1 time(s). Last edit at 10/06/2020 08:16PM by Enerology.

funnly enough in stepper.cpp

you might also want to take a look in indirection.h

has things like #define X_STEP_WRITE(STATE) WRITE(X_STEP_PIN,STATE) so might be a good place to implment your gpio expander stuff

Edited 1 time(s). Last edit at 10/07/2020 06:30AM by Dust.

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Enerology
I am adding a high-frequency GPIO expander for my esp32 to control 8 extruders and need to know where the DIR and STP pins are written to in the firmware so I can intercept the data and inject custom code to write to the GPIO expander instead. This is for a custom multi-jet 3d printer.

Sounds like a super cool project by the way. Is there any documentation of the project available anywhere?

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http://www.marinusdebeer.nl/

Not yet, I am almost done with everything on the machine and the folks on the Discord 3D printing forums convinced me to do a complete showcase of the printer and post it to Youtube. The thing is a monster, it has 4 Steppers for the X, 4 for Y & 4 for Z and 8 for extruders. I have +60 stepper motors so I just wanted to do a insane build with some of them.

Thanks!

Quote
Enerology
Not yet, I am almost done with everything on the machine and the folks on the Discord 3D printing forums convinced me to do a complete showcase of the printer and post it to Youtube. The thing is a monster, it has 4 Steppers for the X, 4 for Y & 4 for Z and 8 for extruders. I have +60 stepper motors so I just wanted to do a insane build with some of them.

Wow!!!!


I know it is not done though could you post a single full size photo.

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Computer Programmer / Electronics Technician