Digital Out and Digital In with AVR :D (For Attiny4313)

gistfile1.txt

/* Name: main.c
 * Author: <insert your name here>
 * Copyright: <insert your copyright message here>
 * License: <insert your license reference here>
 
 DDRB &= ~_BV(DDB2); //clear pin state
 val = PINB & _BV(PB2); //get value of the pin
 */

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

void delay_ms( int ms );
void chaser();

int main(void)
{
    
    int pins[] = {PD5, PD4, PD3, PD2, PD1, PB4, PB3, PB2, PB1, PB0};

    DDRD &= ~_BV(PD6); //Clear PD6
    
    int i;
    int len = (sizeof(pins) / sizeof(int));
    for(i = 0; i < len; i++){
        if(i >= 5){
            //DDRB |= (1 << pins[i]);
            DDRB |= _BV(pins[i]);
        }
        else{
            //DDRD |= (1 << pins[i]);
            DDRD |= _BV(pins[i]);
        }
    }
    
    while(1){
        int val = PIND & _BV(PD6);
        if(val == 0){
            walker(pins, len);
        }
        else{
            chaser(pins, len);
        }
    }

    return 0;   /* never reached */
}

void chaser(int pins[], int len){
    int i;
    for(i = 0; i < len; i++){
        if(i >= 5){
            //PORTB |= (1 << pins[i]);
            PORTB |= _BV(pins[i]);
            delay_ms(10);
            //PORTB &= ~(1 << pins[i]);
            PORTB &= ~_BV(pins[i]);
            delay_ms(10);
        }
        else {
            //PORTD |= (1 << pins[i]);
            PORTD |= _BV(pins[i]);
            delay_ms(10);
            //PORTD &= ~(1 << pins[i]);
            PORTD &= ~_BV(pins[i]);
            delay_ms(10);
        }
    }
    return;
}

void walker(int pins[], int len){
    int i;
    for(i = 0; i < (len/2)+1; i++){
        //PORTB |= (1 << pins[i]);
        PORTB |= _BV(pins[i+5]);
        delay_ms(10);
        //PORTB &= ~(1 << pins[i]);
        PORTB &= ~_BV(pins[i+5]);
        delay_ms(10);

        //PORTD |= (1 << pins[i]);
        PORTD |= _BV(pins[abs(i-5)]);
        delay_ms(10);
        //PORTD &= ~(1 << pins[i]);
        PORTD &= ~_BV(pins[abs(i-5)]);
        delay_ms(10);
    }
    return;    
}

void delay_ms( int ms )
{
    int i;
    for (i = 0; i < ms; i++)
    {
        _delay_ms(1);
    }
}