Laser and spindle on MKS Sbase V1.3

[anarion999]

Hey there,
Since two days I am trying to get a firmware ready based on grblHAL for the MKS Sbase v1.3 which is capable of using two different PWM pins for controlling laser and spindle. I think I am missing something or just being too stupid to put the pieces together.
I think I found the relevant parts in the respective *.h files but I was not able so far to get the things working.
From the mks_sbase_map.h the relevant part is to my mind the following:

_// Define driver spindle pins

#if DRIVER_SPINDLE_PWM_ENABLE
#ifdef SPINDLE_PWM_PIN_2_4
#define SPINDLE_PWM_CHANNEL PWM1_CH5 // MOSFET3 (P2.4)
#else
#define SPINDLE_PWM_CHANNEL PWM1_CH6 // BED MOSFET (P2.5)
#endif
#define SPINDLE_PWM_USE_PRIMARY_PIN false
#define SPINDLE_PWM_USE_SECONDARY_PIN true
#else
#define AUXOUTPUT0_PN 2
#define AUXOUTPUT0_PORT port(AUXOUTPUT0_PN)
#define AUXOUTPUT0_PIN 4
#endif_

I also found in the config.h the part for the definition of the number of spindles/PWM devices:

/*! \def N_SPINDLE
\brief Defines number of spindles supported - minimum 1, maximum 32.
*/
#if !defined N_SPINDLE || defined DOXYGEN
#define N_SPINDLE 2
#endif

Here, I suppose that I should increase the number to 2...

And then finally the part of my_machine.h:

#define SPINDLE0_ENABLE SPINDLE_PWM0
#define SPINDLE1_ENABLE SPINDLE_PWM1
//#define SPINDLE2_ENABLE SPINDLE_PWM0_CLONE
//#define SPINDLE3_ENABLE SPINDLE_NONE
// **********************

But now I don't understand how to tell the code that I want to use two different PWM pins for the devices and also were to remap the respective pins accordingly. Also the PWM-Channel thing form the mks_sbase_map.h is unclear for me. And the final question for me is how two switch between the two PWM devices in a respective controlling software?

I am really confused at this point and your help is more than aprreciated.

Thanks you and best regards

Florian

[terjeio]

The LPC176x only has code support for a single PWM output. The allowed pin definitions for PWM can be found here.
Without adding code for a second PWM spindle the only option is to #define N_SPINDLE 2 in config.h and
#define SPINDLE0_ENABLE SPINDLE_PWM0
#define SPINDLE1_ENABLE SPINDLE_PWM0_CLONE
which will use the spindle direction output as spindle enable for the cloned spindle.
The cloned spindle has to be enabled with $511=1. Spindle switching is either by tool number or by M104.
Note that I have not yet tested this option with this driver.

With new code one has to add code explicitly for a new spindle (SPINDLE_PWM1) and register that with the core, something I have not done yet. Alternatively add code for an analog PWM output and enable SPINDLE_PWM2 which claims the output and register it as a spindle. The code neded for an analog output can be complex depending on the MCU, an example can be found here.