Svenska ElektronikForumet

Kod: Markera allt

#include <avr/io.h>
#include <util/delay.h>

/* delay units of 10 msec */
void delay10Ms(unsigned int cnt){
    if(cnt == 0) return; //failsafe
    
    while(cnt--){
        _delay_ms(10);
    }
}

//high = Button pressed
//low = No button pressed
//react on PB0, internal pullup
unsigned char isButtonPressed(void){
    if( PINB & _BV(PB0) ){
        return 0;
    }else{
        return 1;
    }
}

int main(void){
    unsigned char num;
    
    //init ports
    DDRC = 0x00; //PORTC in
    DDRB = 0x00; //PORTB in
    
    PORTC = 0x00; //all low on PORTC
    PORTB = 0xFF; //pullup on inputs pin
   
    TCCR0B = _BV(CS00); //start timer0
    
    
    //main loop
    for(;;){
        //check if button is pressed
        if( isButtonPressed() ){
            
            //this is random becouse button is pressed 
            // @ random time
            
            //get a number(0 to 5) from timer0
            num = 1<<(TCNT0 % 6); 
            
            
            //trigger sound
            DDRC |= num;    //pin output
            delay10Ms(200); //delay 2 sec
            DDRC &= ~num;   //pin input
            
            //wait until button is released
            while(isButtonPressed())continue;
        }
        
    }
}