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ardupilot/libraries/AP_HAL_Linux/ToneAlarm.h

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#pragma once
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#include <AP_HAL/AP_HAL.h>
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namespace Linux {
class ToneAlarm {
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public:
ToneAlarm();
virtual bool init();
virtual void set_buzzer_tone(float frequency, float volume, uint32_t duration_ms);
private:
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int32_t period_fd;
int32_t duty_fd;
int32_t run_fd;
};
}