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標題: AVR單片機定時器做的門鈴程序+電路 [打印本頁]

作者: jinsheng7533967 時間: 2018-12-22 12:11
標題: AVR單片機定時器做的門鈴程序+電路

#define F_CPU  1000000UL
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#define INT8U unsigned char
#define INT16U  unsigned int

#define DoorBell() (PORTD ^= 0x01)       /

#define Key_DOWN() ((PINB & 0x80) == 0x00)

volatile INT16U soundDelay;                //兩個不同取值分別對應于"叮","咚"

int main()
{
      DDRB = 0;    PORTB = 0xff;

      DDRD = 0xff;

      TCCR1B = 0x01;

      TCNT1 = -700;

      sei();

      while(1)
      {
            if( Key_DOWN() )
            {
                     TIMSK = _BV(TOIE1);

                     soundDelay = -700;

                     _delay_ms(400);

                     soundDelay = -1000;

                     _delay_ms(600);

                     TIMSK = 0x00;
            }

      }

}

ISR ( TIMER1_OVF_vect )
{

      DoorBell();

            TCNT1 = soundDelay;

}

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