c - Using 8-1 Multiplexer with atmega16 -

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i trying use 8-1 multiplexer @ mega16 trying maximize input pins made program scan addresses of multiplexer , listen interrupt if interrupt happens program check address sent @ moment print string on lcd (and managed switch case) ...

the problem is :: when interrupt happens in switch case , execute cases under 1 starts on

ex: if pressed first button(first address) execute cases, if pressed second 1 execute it' case , third case ans on 

int main(void) {     //////////////////////     setmusk(mcucr,isc01);     /* when(isc01 =1 , isc00 =0 )the falling edge of int0 generates interrupt request. can use internal pull resistance*/     clearmusk(mcucr,isc00);     ///////////////////////       gicr = 0x40;         clearmusk(sfior,pud); //enabling pull resistor         ddrc = 0xff;        lcd_init();       ddrc = 0xff;     ddra = 0xff;     ddrd = 0x00;            lcd_send_command(clear_display_and_ram);             lcd_display_string("program starting !!");             _delay_ms(250);             _delay_ms(250);             _delay_ms(250);             _delay_ms(250);             _delay_ms(250);             _delay_ms(250);             _delay_ms(250);             lcd_send_command(clear_display_and_ram);       sei(); // enabling global interrupt musk     while(1)     {             (porta=0x00;porta <= 7;porta++) ;          //todo:: please write application code      }  }  isr(int0_vect)/*sending isr address vector table using statement here (int0_vect)*/ {       switch (pina)         {             case addr0 :             {                 lcd_send_command(clear_display_and_ram);             lcd_display_string("first");             _delay_ms(200);              lcd_send_command(clear_display_and_ram);               break;             }               case addr1 :             {             lcd_send_command(clear_display_and_ram);             lcd_display_string("second");             _delay_ms(200);              lcd_send_command(clear_display_and_ram);              break;             }              case addr2 :             {                 lcd_send_command(clear_display_and_ram);             lcd_display_string("third");             _delay_ms(200);              lcd_send_command(clear_display_and_ram);              break;             }                case addr3 :             {                 lcd_send_command(clear_display_and_ram);             lcd_display_string("fourth");             _delay_ms(250);              lcd_send_command(clear_display_and_ram);              break;             }                case addr4 :             {                 lcd_send_command(clear_display_and_ram);             lcd_display_string("fifth");             _delay_ms(250);              lcd_send_command(clear_display_and_ram);              break;              }              case addr5 :             {                 lcd_send_command(clear_display_and_ram);             lcd_display_string("sixth");             _delay_ms(250);              lcd_send_command(clear_display_and_ram);              break;              }              case addr6 :             {                 lcd_send_command(clear_display_and_ram);             lcd_display_string("seventh");             _delay_ms(250);              lcd_send_command(clear_display_and_ram);             break;             }               case addr7 :             {                 lcd_send_command(clear_display_and_ram);             lcd_display_string("eights");             _delay_ms(250);              lcd_send_command(clear_display_and_ram);             break;             }               //default:             //break;         }  }

mux.h { #define addr0 0x00 //00000000 #define addr1 0x01 //00000001 #define addr2 0x02 //00000010 #define addr3 0x03 //00000011 #define addr4 0x04 //00000100 #define addr5 0x05 //00000101 #define addr6 0x06 //00000110 #define addr7 0x07 //00000111 }


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