#include <io.h>
#include <delay.h>

void main(void)
{      
    unsigned char mode = 0; 
    unsigned char counter = 0;
    unsigned char dirChanged = 0;
    
    // Input
    DDRC &= ~((1 << 0) | (1 << 1));
    // Pullup       
    PORTC |= ((1 << 0) | (1 << 1)); 
    
    // Output
    DDRA = 0xFF;
            
    PORTA = 1 << mode;  
    while(1)
    {       
        // Mode     
        if((PINC & (1 << 0)) == 0)
        {                  
            while((PINC & (1 << 0)) == 0)
            {
                // do nothing
            }
              
            mode++;
            if(mode >= 5)
            {           
                mode = 0;
            }                 
            
            PORTA = 1 << mode;
        }
         
        // Enter
        if((PINC & (1 << 1)) == 0)
        {          
            PORTA = 0;  
            counter = 0;
            while((PINC & (1 << 0)) != 0)
            {   
                if(mode == 0)
                {             
                    // Blink
                    PORTA = ~PORTA;
                }           
                
                if(mode == 1)
                {                  
                    // UpCounter
                    PORTA++;
                }
                
                if(mode == 2)
                {    
                    // ringCounter
                    PORTA = 1 << counter;
                    counter++;
                    if(counter >= 8)
                    {              
                        counter = 0;
                    }
                }
                
                if(mode == 3)
                {     
                    if(dirChanged  == 0)
                    {                  
                        PORTA = 1 << counter;    
                    }
                    else
                    {
                        PORTA = 1 << (7-counter);
                    }  
                    
                    counter++;
                    if(counter >= 8)
                    {          
                        dirChanged = !dirChanged;    
                        counter = 1;
                    }
                }
                
                if(mode == 4)
                {    
                    PORTA ^= 1 << counter;
                    counter++;
                    if(counter >= 8)
                    {              
                        counter = 0;
                    }
                } 
                
                delay_ms(50);
            }    
        }    
    }
}
   