Disable PWM output while updating NeoPixels.

Marlin/src/HAL/STM32/HAL.h

@@ -29,6 +29,7 @@
 #include "../shared/math_32bit.h"
 #include "../shared/HAL_SPI.h"
 #include "fastio.h"
+#include "Servo.h"
 #include "watchdog.h"
 #include "MarlinSerial.h"
 
@@ -110,6 +111,9 @@
 typedef int16_t pin_t;
 
 #define HAL_SERVO_LIB libServo
+#define PAUSE_SERVO_OUTPUT() libServo::pause_all_servos()
+#define RESUME_SERVO_OUTPUT() libServo::resume_all_servos()
+#define HAS_PAUSE_SERVO_OUTPUT HAS_SERVOS
 
 // ------------------------
 // Public Variables

Marlin/src/HAL/STM32/eeprom_flash.cpp

@@ -28,15 +28,6 @@
 
 #include "../shared/eeprom_api.h"
 
-#if HAS_SERVOS
-  #include "Servo.h"
-  #define PAUSE_SERVO_OUTPUT() libServo::pause_all_servos()
-  #define RESUME_SERVO_OUTPUT() libServo::resume_all_servos()
-#else
-  #define PAUSE_SERVO_OUTPUT()
-  #define RESUME_SERVO_OUTPUT()
-#endif
-
 /**
  * The STM32 HAL supports chips that deal with "pages" and some with "sectors" and some that
  * even have multiple "banks" of flash.

Marlin/src/feature/leds/neopixel.h

@@ -105,6 +105,8 @@ public:
   }
 
   static inline void show() {
+    // Some platforms cannot maintain PWM output when NeoPixel disables interrupts for long durations.
+    TERN_(HAS_PAUSE_SERVO_OUTPUT, PAUSE_SERVO_OUTPUT());
     adaneo1.show();
     #if PIN_EXISTS(NEOPIXEL2)
       #if CONJOINED_NEOPIXEL
@@ -115,6 +117,7 @@ public:
         adaneo1.setPin(NEOPIXEL_PIN);
       #endif
     #endif
+    TERN_(HAS_PAUSE_SERVO_OUTPUT, RESUME_SERVO_OUTPUT());
   }
 
   #if 0

Marlin/src/inc/Conditionals_post.h

@@ -1999,6 +1999,9 @@
 #if NUM_SERVOS > 0
   #define HAS_SERVOS 1
 #endif
+#if !HAS_SERVOS || !defined(HAS_PAUSE_SERVO_OUTPUT)
+  #define HAS_PAUSE_SERVO_OUTPUT 0
+#endif
 
 // Sensors
 #if PIN_EXISTS(FILWIDTH)