Distinguish between BUZZER and SPEAKER (PR#2513)

A speaker needs a AC or a pulsed DC to make a sound, a buzzer only needs a DC.
A buzzer has it's own resonator. It works in most cases to feed the buzzer with a pulsed DC, but the sound will not be as loud as with pure DC.

There seem to be boards where the BEEPER-pin is not able to handle a PWM. Obviously intended for a buzzer.
To make these board able to handle a speaker

* replace the PWM based tone()-function again with a on-delay-off-delay loop.

Hopefully the last time I touch the beeper code.

Marlin/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/buzzer.cpp

         lcd_buzz(duration, freq);
       #elif defined(BEEPER) && BEEPER >= 0 // on-board buzzers have no further condition
         SET_OUTPUT(BEEPER);
-        tone(BEEPER, freq, duration);
-        delay(duration);
+        #ifdef SPEAKER // a speaker needs a AC ore a pulsed DC
+          //tone(BEEPER, freq, duration); // needs a PWMable pin
+          unsigned int delay = 1000000 / freq / 2;
+          int i = duration * freq / 1000;
+          while (i--) {
+            WRITE(BEEPER,HIGH);
+            delayMicroseconds(delay);
+            WRITE(BEEPER,LOW);
+            delayMicroseconds(delay);
+           }
+        #else // buzzer has its own resonator - needs a DC
+          WRITE(BEEPER, HIGH);
+          delay(duration);
+          WRITE(BEEPER, LOW);
+        #endif
       #else
         delay(duration);
       #endif

Marlin/configurator/config/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/Felix/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/Felix/Configuration_DUAL.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/Hephestos/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/K8200/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 #define ULTIMAKERCONTROLLER // K8200: for Display VM8201 // as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/RigidBot/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/SCARA/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/WITBOX/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/adafruit/ST7565/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/delta/biv2.5/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/delta/generic/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/delta/kossel_mini/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/delta/kossel_pro/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/makibox/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>

Marlin/example_configurations/tvrrug/Round2/Configuration.h

 //#define ENCODER_STEPS_PER_MENU_ITEM 5 // Set according to ENCODER_PULSES_PER_STEP or your liking
 //#define ULTIMAKERCONTROLLER //as available from the Ultimaker online store.
 //#define ULTIPANEL  //the UltiPanel as on Thingiverse
+//#define SPEAKER // The sound device is a speaker - not a buzzer. A buzzer resonates with his own frequency.
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>