buzzer_control.cpp

Go to the documentation of this file.

 
// INCLUDES ===================================================================
 
#include "../includes/buzzer_control.h"
#include "../includes/config.h"
#include "../includes/parameters.h"
#include "Arduino.h"
 
// INITIALISATION =============================================================
 
#define BUZZER_FREQ 4000
 
#define PERIOD_BUZZER_US (1000000 / BUZZER_FREQ)
 
HardwareTimer* Buzzer_Hw_Timer;
uint32_t Buzzer_Timer_Channel;
 
// FUNCTIONS ==================================================================
 
void BuzzerControl_Init(void) {
    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);
}
 
void BuzzerControl_On(void) { Buzzer_Hw_Timer->resume(); }
 
void BuzzerControl_Off(void) {
    Buzzer_Hw_Timer->pause();
    digitalWrite(PIN_BUZZER, LOW);  // Stops current consumption in the buzzer
}