buzzer_control.h File Reference

Abstraction to switch buzzer ON or OFF. More...

Go to the source code of this file.

Functions
void	BuzzerControl_Init (void)
	Initialization of HardwareTimer for buzzer. More...
void	BuzzerControl_On (void)
	Switch buzzer ON. More...
void	BuzzerControl_Off (void)
	Switch buzzer OFF. More...

Detailed Description

Abstraction to switch buzzer ON or OFF.

Author

Makers For Life

Copyright

Copyright (c) 2020 Makers For Life

Definition in file buzzer_control.h.

Function Documentation

BuzzerControl_Init()

void BuzzerControl_Init

(

void

)

Initialization of HardwareTimer for buzzer.

Definition at line 27 of file buzzer_control.cpp.

                              {
    TIM_TypeDef* Buzzer_Timer_Number = reinterpret_cast<TIM_TypeDef*>(
        pinmap_peripheral(digitalPinToPinName(PIN_BUZZER), PinMap_PWM));
    Buzzer_Timer_Channel =
        STM_PIN_CHANNEL(pinmap_function(digitalPinToPinName(PIN_BUZZER), PinMap_PWM));
 
    // Hardware 2: the buzzer has no internal oscillator. uC must generate a 4khz square on
    // PIN_BUZZER (timer 2, channel 1)
    Buzzer_Hw_Timer = new HardwareTimer(Buzzer_Timer_Number);
    Buzzer_Hw_Timer->setMode(Buzzer_Timer_Channel, TIMER_OUTPUT_COMPARE_PWM1, PIN_BUZZER);
    Buzzer_Hw_Timer->setOverflow(PERIOD_BUZZER_US, MICROSEC_FORMAT);
    Buzzer_Hw_Timer->setCaptureCompare(Buzzer_Timer_Channel, PERIOD_BUZZER_US / 2,
                                       MICROSEC_COMPARE_FORMAT);
    digitalWrite(PIN_BUZZER, LOW);
}

BuzzerControl_Off()

void BuzzerControl_Off

(

void

)

Switch buzzer OFF.

Definition at line 45 of file buzzer_control.cpp.

                             {
    Buzzer_Hw_Timer->pause();
    digitalWrite(PIN_BUZZER, LOW);  // Stops current consumption in the buzzer
}

BuzzerControl_On()

void BuzzerControl_On

(

void

)

Switch buzzer ON.

Definition at line 43 of file buzzer_control.cpp.

{ Buzzer_Hw_Timer->resume(); }