-
- #include <avr/io.h>
- #include <avr/interrupt.h>
-
- #define F_CPU 16000000
- #define USART_BAUDRATE 9600
- //#define BAUD 9600
- #define BAUD 76800
- //#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)
- #define BAUD_PRESCALE ((uint16_t) ((F_CPU / ((USART_BAUDRATE) * 16.0)) + .5) - 1)
- #include <util/setbaud.h>
-
- int main (void)
- {
- char ReceivedByte;
-
- UCSR0B = (1 << RXEN0) | (1 << TXEN0); // Turn on the transmission and reception circuitry
- //UCSR0C = (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1); // Use 8-bit character sizes
- UCSR0C = (1 << UCSZ01) | (1 << UCSZ00); // Use 8-bit character sizes
-
- UBRR0H = (BAUD_PRESCALE >> 8); // Load upper 8-bits of the baud rate value into the high byte of the UBRR register
- UBRR0L = BAUD_PRESCALE; // Load lower 8-bits of the baud rate value into the low byte of the UBRR register
-
- for (;;) // Loop forever
- {
- while ((UCSR0A & (1 << RXC0)) == 0) {}; // Do nothing until data have been received and is ready to be read from UDR
- ReceivedByte = UDR0; // Fetch the received byte value into the variable "ByteReceived"
-
- while ((UCSR0A & (1 << UDRE0)) == 0) {}; // Do nothing until UDR is ready for more data to be written to it
- UDR0 = ReceivedByte; // Echo back the received byte back to the computer
-
-
- }
- }
-