a2uNTWLM

1#include <avr/io.h>
2#include <stdio.h>
3
4int main(void)
5{
6    DDRA = 0x00; //PORTA = 0x00;
7    DDRB = 0xFF; //PORTB = 0x00;
8
9    typedef enum {
10        firstkey,
11        secondkey,
12        dooropens,
13        }doorstate;
14
15    doorstate state = firstkey;
16    char secretkey;
17    while (1) 
18    {
19        switch(state) 
20        {
21            case firstkey:
22                scanf("%c", secretkey); //?????
23                if (secretkey == '#')  {
24                    PORTA == 0x01 << 3;
25                    state = secondkey; 
26                }
27                else 
28                    state = firstkey;  
29                break;
30            case secondkey:
31                scanf("%c", secretkey);//?????
32                if (secretkey == 'Y')  {
33                    PORTA = PORTA | 0x02;
34                    state = dooropens;
35                }
36                else 
37                    state = firstkey;  
38                break; 
39            case dooropens:
40                PORTB = 0x01;
41                if (PORTA == 0x80) {
42                    state = firstkey;
43                    PORTB = 0x00;
44                }
45                break;
46            default:
47                state = firstkey;
48        }
49    }
50}