AVR第5课：蜂鸣器

/*

*info:buzzer

*author:chenlu

*date:2014.11.20

*/

//input the head file so that the program can work normally

//iom16v---know the register

//macros---know the BIT(x)

#include

#include

//use those can make your study very conveninet

#define uint unsigned int

#define uchar unsigned char

//display methods 

void initSystem();

void delay();

//the main function

void main()

{

  //init your system

initSystem();

while(1)

{

  //start your function,and this is core solution

PORTA = PORTA & (~BIT(1));

delay();

delay();

delay();

delay();

PORTA = PORTA | BIT(1);

delay();

delay();

delay();

delay();

}

}

//the method of init system

void initSystem()

{

  //to make PA1 port output 

DDRA = DDRA | BIT(1);

//to make PA1 port output high level

PORTA = PORTA | BIT(1);

}

//the sub method of delay

void delay()

{

  uchar i,j;

  for(i=0;i<250;i++)

  for(j=0;j<250;j++);

}

让蜂鸣器响一下，接着停一下，如此循环。