avr-sequence-memory/main.c

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

#define PORT_LED PORTB
#define PIN_SWITCH PIND

bool do_round(uint8_t *seq, int len);
void display_seq(uint8_t *seq, int len);
bool read_input(uint8_t *seq, int len);

int main(){
    // Port B LED
    DDRB = 0xFF;

    // Port A Switch
    DDRD = 0x00;

    // Values from 0-7 representing the LED position
    uint8_t seq[] = {4,2,4,5,1,0,3};

    if (do_round(seq,7)) {
        while (true)
        {
            PORT_LED = 0x55;
            _delay_ms(250);
            PORT_LED = 0xAA;
            _delay_ms(250);
        }
    }else{
        while (true)
        {
            PORT_LED = 0xF0;
            _delay_ms(250);
            PORT_LED = 0x0F;
            _delay_ms(250);
        }
    }
    
}

bool do_round(uint8_t *seq, int len){

    for (int i = 2; i < len; i++)
    {
        display_seq(seq,i);
        if (!read_input(seq,i)){
            // Failed
            return false;
        }
    }
    return true;
}

void display_seq(uint8_t *seq, int len){

    // Turn off all LEDs
    PORT_LED = 0xFF;

    _delay_ms(1000);

    for (int i = 0; i < len; i++)
    {
        PORT_LED = (0xFF ^ (1 << seq[i] ));

        _delay_ms(1000);

        // Turn off LEDs
        PORT_LED = 0xFF;
        _delay_ms(250);
    }


    // Turn off all LEDs
    PORT_LED = 0xFF;    
}

bool read_input(uint8_t *seq, int len){
    for (int i = 0; i < len; i++)
    {   
        uint8_t expected = 0xFF ^ (1 << seq[i]);

        bool run = true;
        while (run)
        {
            uint8_t input = PIN_SWITCH;
            if (input < 0xFF){
                // A button is pressed
                if (input == expected){
                    run = false;

                    // Wait for button to release
                    while (PIN_SWITCH != 0xFF)
                    {
                    
                    }

                    // "debounce"
                    _delay_ms(50);
                    
                }else{
                    return false;
                }
            }
        }
    }
    return true;
}