USART.c

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#include "includes/CPU.h"
#include <avr/io.h>
#include "includes/USART.h"
#include <util/setbaud.h>
 
void initUSART(void)
{
#ifdef BAUD
#warning "BAUD IS DEFINED"
#else
#warning "BAUD ISNT DEFINED"
#endif
 
    /* Set baud rate registers */
    UBRR0H = UBRRH_VALUE;
    UBRR0L = UBRRL_VALUE;
 
    /* Configure double speed mode if necessary */
#if USE_2X
    UCSR0A |= (1 << U2X0);
#else
    UCSR0A &= ~(1 << U2X0);
#endif
 
    /* Enable transmitter and receiver */
    UCSR0B = (1 << TXEN0) | (1 << RXEN0);
 
    /* Set frame format: 8 data bits, 1 stop bit, no parity */
    UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
}
 
void transmitByte(uint8_t data)
{
    loop_until_bit_is_set(UCSR0A, UDRE0);
    UDR0 = data;
}
 
uint8_t receiveByte(void)
{
    loop_until_bit_is_set(UCSR0A, RXC0);
    return UDR0;
}
 
void printString(const char *String)
{
    while (*String)
        transmitByte(*String++);
}