✨ Two controller fans (MarlinFirmware#24995)

Author: vovodroid

Marlin/Configuration_adv.h

@@ -538,6 +538,7 @@
 //#define USE_CONTROLLER_FAN
 #if ENABLED(USE_CONTROLLER_FAN)
   //#define CONTROLLER_FAN_PIN -1           // Set a custom pin for the controller fan
+  //#define CONTROLLER_FAN2_PIN -1          // Set a custom pin for second controller fan
   //#define CONTROLLER_FAN_USE_Z_ONLY       // With this option only the Z axis is considered
   //#define CONTROLLER_FAN_IGNORE_Z         // Ignore Z stepper. Useful when stepper timeout is disabled.
   #define CONTROLLERFAN_SPEED_MIN         0 // (0-255) Minimum speed. (If set below this value the fan is turned off.)

Marlin/src/feature/controllerfan.cpp

@@ -40,6 +40,9 @@ uint8_t ControllerFan::speed;
 
 void ControllerFan::setup() {
   SET_OUTPUT(CONTROLLER_FAN_PIN);
+  #ifdef CONTROLLER_FAN2_PIN
+    SET_OUTPUT(CONTROLLER_FAN2_PIN);
+  #endif
   init();
 }
 
@@ -95,6 +98,13 @@ void ControllerFan::update() {
         hal.set_pwm_duty(pin_t(CONTROLLER_FAN_PIN), speed);
       else
         WRITE(CONTROLLER_FAN_PIN, speed > 0);
+
+      #ifdef CONTROLLER_FAN2_PIN
+        if (PWM_PIN(CONTROLLER_FAN2_PIN))
+          hal.set_pwm_duty(pin_t(CONTROLLER_FAN2_PIN), speed);
+        else
+          WRITE(CONTROLLER_FAN2_PIN, speed > 0);
+      #endif      
     #endif
   }
 }