#include <mega32a.h>

// Alphanumeric LCD functions
#include <alcd.h>
#include <delay.h>

typedef struct {
                    unsigned char pa_dir;
                    unsigned char pb_dir;
                    unsigned char pc_dir;
                    unsigned char pd_dir; 
                    ////////////////////////////
                    unsigned char pa_val;
                    unsigned char pb_val;
                    unsigned char pc_val;
                    unsigned char pd_val;} gpio_ss;


gpio_ss pins;

void gpio_init (gpio_ss *x)
{
 DDRA = x -> pa_dir;
 DDRB = x -> pb_dir;
 DDRC = x -> pc_dir;
 DDRD = x -> pd_dir;  
 
 PORTA = x -> pa_val; 
 PORTB = x -> pb_val; 
 PORTC = x -> pc_val; 
 PORTD = x -> pd_val; 
 
}

void set_port(char p_name, unsigned char p_value){
 switch(p_name)  {
    case 'A':
        PORTA=p_value;
    break;
    case 'B':
        PORTB=p_value;
    break;
    case 'C':
        PORTC=p_value;
    break;
    case 'D':
        PORTD=p_value;
    break;

   }


}
 
#define In 0x00
#define Out 0xff
                    

void main(void)
{
    pins.pa_dir=Out;
    
    
    gpio_init(&pins);

while (1)
      {   
        set_port('A',0xff);  
        delay_ms(500);
        set_port('A',0x00);
        delay_ms(500);


      }
}