tabby/avr/uart.c

#include <stdio.h>

#include <avr/io.h>
#include <avr/interrupt.h>

#include <tabby/avr/uart.h>

#define F_CPU 16000000UL
#define BAUD  TABBY_AVR_UART_BAUD

#include <util/setbaud.h>

void uart_init() {
    UBRR1H = UBRRH_VALUE;
    UBRR1L = UBRRL_VALUE;

#if USE_2X
    UCSR1A |= _BV(U2X1);
#else
    UCSR1A &= ~(_BV(U2X1));
#endif

    UCSR1C = _BV(UCSZ11) | _BV(UCSZ10);
    UCSR1B = _BV(RXEN1)  | _BV(TXEN1);
}

void uart_putchar(char c, FILE *fh) {
    loop_until_bit_is_set(UCSR1A, UDRE1);

    UDR1 = c;
}

char uart_getchar(FILE *fh) {
    loop_until_bit_is_set(UCSR1A, RXC1);

    return UDR1;
}