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  1. #define FOSC 16000000
  2. #define BAUD 9600
  3. #define MYUBRR FOSC/16/BAUD-1
  4.  
  5. ISR(USART_RX_vect){
  6.   uint8_t result = UDR0;
  7.   switch(result){
  8.       case '1':
  9.         PORTB |= (1 << PB3);
  10.       break;
  11.  
  12.       case '2':
  13.         PORTB &= ~(1 << PB3);
  14.       break;      
  15.     }  
  16. }
  17.  
  18. void USART_Init( unsigned int ubrr){
  19.   UBRR0H = (unsigned char)(ubrr>>8);
  20.   UBRR0L = (unsigned char)ubrr;
  21.   UCSR0B = (1 << RXCIE0) | (1 << RXEN0);
  22.   UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
  23. }
  24.  
  25.  
  26. void setup() {
  27.   DDRB = 1 << PB3;
  28.   USART_Init(MYUBRR);
  29.   sei();
  30. }
  31.  
  32. void loop() {  
  33.  
  34. }
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