Peter AVR

/*
 * Peter_Game.c
 *
 * Created: 10/03/2012 13:57:46
 *  Author: Peter
 */


#include <avr/io.h>
#include <stdlib.h>
#define LIGHTDIODE 0
#define WAITPRESS 1
#define GETPRESS 2
#define CHECKPRESS 3
#define BLINK 4

static unsigned char state;

static unsigned char get_portB_input(void) {
    return ~PINB;
}

static void set_portA(unsigned char port_value) {
    PORTA = ~port_value;
}

static void led_on(unsigned char ledNo) {
    PORTA &= ~(1 << ledNo);
}

static void leds_on() {
    set_portA(0xff);
}

static void leds_off(void) {
    set_portA(0x00);
}

static void init_io(void) {
    DDRA = 0xff;
    DDRB = 0x00;
    leds_off();
}

static void delay(int time) {
    volatile int count1 = 0;

    while (count1 < time) {
        volatile int count2 = 0;

        while (count2 < time) {
            count2++;
        }
        count1++;
    }
}


static void blink(void)
{
    int x = 10;

    while (x)
    {
        leds_on();
        delay(250);
        leds_off();
        delay(250);
        x--;
    }
}

int main(void) {
    int time = 0, wait_time = 0;
    int pressed = 0;
    int random_led = 0;
    int time_treshold = 0;
    int score = 0;

    init_io();

    state = BLINK;

    while (1)
    {
        switch (state)
        {
            case BLINK:
            {
                blink();
                state = LIGHTDIODE;
                delay(250);
                wait_time = 1000;
                score = 0;
                break;
            }
            case LIGHTDIODE:
            {
                random_led = 4 + (int)(rand() / (RAND_MAX / 4 + 1));
                led_on(random_led);
                delay(250);
                time = wait_time;
                state = WAITPRESS;
                time_treshold = wait_time / 4;
                break;
            }
            case WAITPRESS:
            {
                if(time > 0) {
                    if(time == time_treshold){
                        set_portA(15 | (1 << random_led));
                    }
                    else if(time == 2*time_treshold){
                        set_portA(7 | (1 << random_led));
                    }
                    else if(time == 3*time_treshold){
                        set_portA(3 | (1 << random_led));
                    }
                    else if(time == 4*time_treshold){
                        set_portA(1 | (1 << random_led));
                    }
                    state = GETPRESS;
                    break;
                }
                state = CHECKPRESS;
                break;
            }
            case GETPRESS:
            {
                pressed = get_portB_input();
                if(pressed == 0) {
                    state = WAITPRESS;
                    time--;
                } else {
                    state = CHECKPRESS;
                }
                delay(70);
                break;
            }
            case CHECKPRESS:
            if(pressed == (1 << random_led)) {
                wait_time -= 0.1 * wait_time;
                leds_off();
                delay(500);
                state = LIGHTDIODE;
                score++;
                break;
            } else {
                leds_off();
                delay(500);
                state = BLINK;
                set_portA(score);
                delay(2000);
                break;
            }
        }
    }
}