/**************************************/
/* Not so powerful Debouncing Example */
/* No Interrupt needed                */
/* Author: Peter Dannegger            */
/**************************************/
#define debounce(port,pin)({\
    static uint8_t flag = 0;\
    uint8_t i = 0;\
    if( flag )\
    {\
        while(1)\
        {\
            if( !(port & 1<<pin) )\
            {\
                i = 0;\
                break;\
            }\
            _delay_us( 98 );\
            if( --i == 0 )\
            {\
                flag = 0;\
                i = 0;\
                break;\
            }\
        }\
    }\
    else\
    {\
        while(1)\
        {\
            if( (port & 1<<pin) )\
            {\
                i = 0;\
                break;\
            }\
            _delay_us( 98 );\
            if( --i == 0 )\
            {\
                flag = 1;\
                i = 1;\
                break;\
            }\
        }\
    }\
    i;\
})