tabby/avr/uart.c

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#include <stdio.h>
#include <tabby/avr/uart.h>
#define F_CPU 16000000UL
#define BAUD TABBY_AVR_UART_BAUD
#include <util/setbaud.h>
void uart_init() {
UBRR0H = UBRRH_VALUE;
UBRR0L = UBRRL_VALUE;
#if USE_2X
UCSR0A |= _BV(U2X0);
#else
UCSR0A &= ~(_BV(U2X0));
#endif
UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
UCSR0B = _BV(RXEN0) | _BV(TXEN0);
}
void uart_putchar(char c, FILE *fh) {
loop_until_bit_is_set(UCSR0A, UDRE0);
UDR0 = c;
}
char uart_getchar(FILE *fh) {
loop_until_bit_is_set(UCSR0A, RXC0);
return UDR0;
}