// //write a code to blink leds on port a when any push nutton in port b pressed

// #include <stdint.h>

// #define PINA   (*(volatile uint8_t*)0x20)
// #define DDRA   (*(volatile uint8_t*)0x21)
// #define PORTA  (*(volatile uint8_t*)0x22)

// #define PINB   (*(volatile uint8_t*)0x23)
// #define DDRB   (*(volatile uint8_t*)0x24)
// #define PORTB  (*(volatile uint8_t*)0x25)

// void delay(void){
//     for(volatile uint32_t i=0;i<50000;i++);
// }

// int main(void){
//     DDRA = 0xFF;      
//     DDRB = 0x00;      
    

//     while(1){
//         if((PINB & 0x01) == 0x01){  
//             PORTA = 0xFF;
//             delay();
//             PORTA = 0x00;
//             delay();
//         } else {
//             PORTA = 0x00;
//         }
//     }
// }




//write a code to blink leds corresponding push buton reading
//hardware is same as 1st exp


#include <stdint.h>

#define PINA   (*(volatile uint8_t*)0x20)
#define DDRA   (*(volatile uint8_t*)0x21)
#define PORTA  (*(volatile uint8_t*)0x22)

#define PINB   (*(volatile uint8_t*)0x23)
#define DDRB   (*(volatile uint8_t*)0x24)
#define PORTB  (*(volatile uint8_t*)0x25)

void delay1sec(void){
    TCNT1  = 0;
    TCCR1A = 0x00;
    TCCR1B = 0x05;
    while (TCNT1 < 15625);
    TCCR1B = 0x00;
}

int main(void){
    DDRA = 0xFF;      // LEDs output
    DDRB = 0x00;      // Buttons input

    while(1){
          uint8_t btn = PINB;
          if(btn !=0x00){
            for(uint8_t i=0; i<8; i++){
              if(btn == (1<<i)){
                PORTA = (1<<i);
                delay1sec();
                PORTA = 0x00;
                delay1sec();
              }
            }
          }
        else {
            PORTA = 0x00;
        }
    }
}