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@ -31,8 +31,7 @@ class Speaker: public Buzzer {
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struct state_t {
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tone_t tone;
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uint16_t period;
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uint16_t counter;
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millis_t next;
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} state;
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protected:
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@ -42,8 +41,7 @@ class Speaker: public Buzzer {
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*/
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void reset() {
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super::reset();
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this->state.period = 0;
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this->state.counter = 0;
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this->state.next = 0;
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}
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public:
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@ -60,29 +58,15 @@ class Speaker: public Buzzer {
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* playing the tones in the queue.
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*/
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virtual void tick() {
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if (!this->state.counter) {
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const uint32_t now = millis();
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if (now >= this->state.next) {
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if (this->buffer.isEmpty()) return;
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this->reset();
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this->state.tone = this->buffer.dequeue();
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// Period is uint16, min frequency will be ~16Hz
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this->state.period = 1000000UL / this->state.tone.frequency;
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this->state.counter =
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(this->state.tone.duration * 1000L) / this->state.period;
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this->state.period >>= 1;
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this->state.counter <<= 1;
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} else {
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const uint32_t now = micros();
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static uint32_t next = now + this->state.period;
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if (now >= next) {
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--this->state.counter;
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next = now + this->state.period;
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if (this->state.tone.frequency > 0) this->invert();
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}
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this->state.next = now + this->state.tone.duration;
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::tone(BEEPER_PIN, this->state.tone.frequency, this->state.tone.duration);
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}
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}
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};
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