(AVR) 1 Nút Nhấn Nhiều Chức Năng – CodeVisionAVR

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Code

/*******************************************************
Chip type               : ATmega16
Program type            : Application
AVR Core Clock frequency: 8.000000 MHz
Memory model            : Small
External RAM size       : 0
Data Stack size         : 256
*******************************************************/
#include <mega16.h>
#define BT PINA.0
#define LED1 PORTB.0
#define LED2 PORTB.1
unsigned char count_T0,count;
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
    TCNT0 = 130; // luu gia tri dem
    count_T0++;
}
void main(void)
{
DDRA = 0x00;
PORTA = 0xff;
DDRB = 0xff;
PORTB = 0x00;
TCCR0 = (1<<CS01)|(1<<CS00); //prescaler = 64
TCNT0 = 130; // x= 0.001(1ms) * 8000000 / 64 = 125
            // TCNT0  = 255 - 125 = 130 
TIMSK |= (1<<TOIE0); // mode Normal, cho phép ngat
#asm ("sei")

while (1)
      {
        if (!BT)
        {
            count = 0;
            do {
                if (count_T0 > 200)
                {
                    count++;
                    count_T0 = 0;
                }
            }
            while ((count < 5) && (!BT));
            if (count == 5)
            {
                LED1 = ~LED1; 
                while(!BT);
            }
            else
            { 
                LED2 = ~LED2;
            }
        }
      }
}

Demo