Code:

#define USB_CFG_IOPORTNAME      D
/* This is the port where the USB bus is connected. 

#define USB_CFG_DMINUS_BIT      3
/* This is the bit number in USB_CFG_IOPORT where the USB D- line is connected.

#define USB_CFG_DPLUS_BIT       4
/* This is the bit number in USB_CFG_IOPORT where the USB D+ line is connected.


static inline void  bootLoaderInit(void)
{
    PORTD = 1 << 5; /* activate pull-up for key */
    _delay_us(10);  /* wait for levels to stabilize */
}

#define bootLoaderCondition()   ((PIND & (1 << 5)) == 0)   /* True if jumper is set */

Code:

#define USB_CFG_IOPORTNAME    D
#define USB_CFG_DMINUS_BIT      0
#define USB_CFG_DPLUS_BIT        2

Code:

static inline void  bootLoaderInit(void)
{
char i;
    PORTD = 1;      /* activate pull-up */
    for(i=0;i<10;i++);  /* delay to allow pin voltage to stabilize */
}

#define bootLoaderCondition()   ((PIND & 1) == 0)

Code:

#define USB_CFG_IOPORTNAME    D
#define USB_CFG_DMINUS_BIT      1
#define USB_CFG_DPLUS_BIT        2