Configure extruder fan speed in menu

[vovodroid]

This PR is draft.

Recently I replaced extruder fan, and new one is much stronger (and noisy) than old one. But it's impossible to change EXTRUDER_AUTO_FAN_SPEED speed without recompiling. and to find comfort noise level several iteration could be needed, as well to adjust per filament or ambient temperature.

So I tried to add it to menu (currently Controller fans).

But with my current changes it's possible to go only down - speed could be reduced each time (i.e. it could be set consequently 90, 80, 70, etc), but it can't be increased back.

Any help appreciated. Thanks.

[wlkmanist]

There is also may be useful for you: classicrocker883/MRiscoCProUI#125
You can see what parts of the code may be affected when working with fans.

[vovodroid]

As I see this PR doesn't adjust extruder fan speed.

[vovodroid]

For what it's worth, but in latest Marlin (Bump distribution date (2024-09-25)) it's possible to increase fan speed, besides value 100%, which has no effect. But increasing to 99% works.

[vovodroid]

Ok, there is code setting PWM speed:

    #define _UPDATE_AUTO_FAN(P,D,A) do{                   \
      if (PWM_PIN(P##_AUTO_FAN_PIN) && A < 255)           \
        hal.set_pwm_duty(pin_t(P##_AUTO_FAN_PIN), D ? A : 0); \
      else                                                \
        WRITE(P##_AUTO_FAN_PIN, D);                       \
    }while(0)
........
_UPDATE_AUTO_FAN(E##N, fan_on, _AUTOFAN_SPEED());

so when A==255 it calls WRITE(P##_AUTO_FAN_PIN, D); where D is fan_on and resolves to const bool fan_on = TEST(fanState, realFan);

I didn't debug it yet, but I guess that fan_on is evaluated to false. Any ideas?

[vovodroid]

Fixed 100% speed, message moved to language file.