#define PORTB_BASE_ADD ((volatile uint8_t *)0x36)

typedef uint8_t u8 ;
typedef struct
{
  //every port arrangement is AVR 8-bit is as flow :  PIN (base) - DDR (dir) - PORT(out)

    u8 port_in ;
    u8 port_dir ;
    u8 port_out ;
}GPIO_PORT , *GPIO_PORT_PTR;

#define PORT_B (*(GPIO_PORT_PTR)PORTB_BASE_ADD)

int main(void)
{
    PORT_B.port_dir = 0xFF ;
    PORT_B.port_out = 0x50 ;

}