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fd0e81b0c7
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.
36 lines
991 B
C++
36 lines
991 B
C++
#include "Marlin.h"
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#include "buzzer.h"
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#include "ultralcd.h"
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#if HAS_BUZZER
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void buzz(long duration, uint16_t freq) {
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if (freq > 0) {
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#ifdef LCD_USE_I2C_BUZZER
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lcd_buzz(duration, freq);
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#elif defined(BEEPER) && BEEPER >= 0 // on-board buzzers have no further condition
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SET_OUTPUT(BEEPER);
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#ifdef SPEAKER // a speaker needs a AC ore a pulsed DC
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//tone(BEEPER, freq, duration); // needs a PWMable pin
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unsigned int delay = 1000000 / freq / 2;
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int i = duration * freq / 1000;
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while (i--) {
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WRITE(BEEPER,HIGH);
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delayMicroseconds(delay);
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WRITE(BEEPER,LOW);
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delayMicroseconds(delay);
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}
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#else // buzzer has its own resonator - needs a DC
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WRITE(BEEPER, HIGH);
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delay(duration);
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WRITE(BEEPER, LOW);
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#endif
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#else
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delay(duration);
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#endif
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}
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else {
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delay(duration);
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}
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}
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#endif
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