ch2 gpio应用:Buzzer封装

Buzzer封装:

蜂鸣器是GPIO的一个典型应用，下面我们利用C++语言的继承机制完成对Buzzer类的封装，Buzzer类继承自CGpio类，CGpio类的具体实现参考：ch1 gpio封装

亮一张蜂鸣器的电路吧O(∩_∩)O！

Buzzer调用效果：

int main(){ CBsp bsp; bsp.Init(); Buzzer buzzer(PORT_A,PIN_0); buzzer.ON(); if(buzzer.isOn()){ //喂，你在滴滴滴吗？ printf("buzzer is on"); //滴滴滴，正出声呢 } else { printf("buzzer is off"); //我不是很爱讲话 } return 0;}

具体实现：

#ifndef _BUZZER_H_#define _BUZZER_H_#include "gpio.h"#include "buzzer.h"class Buzzer:public CGpio{ public: Buzzer(PORT port,PIN pin); void ON(void); void OFF(void); bool isOn(void)const; //提供获得蜂鸣器是开还是关的方法; private: uint16_t Pin; GPIO_TypeDef *Gpio; bool onState;};#endif
#include "buzzer.h"Buzzer::Buzzer(PORT port,PIN pin): CGpio(port,pin, GPIO_Mode_OUT, GPIO_Speed_40MHz, GPIO_OType_PP, GPIO_PuPd_DOWN){ onState = true; OFF();}void Buzzer::ON(void){ if(onState == false){ this->setBit(1); }}void Buzzer::OFF(void){ if(onState == true){ this->setBit(0); }}bool Buzzer::isOn(void)const{ return onState;}