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45 lines
972 B
C
45 lines
972 B
C
/**
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* @file
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* @author Miguel Fernandes <miguelandre.fernandes@gmail.com>
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* @date 6 de Jun de 2013
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* @brief For redirecting stdout, stdin and stderr
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* see http://www.appelsiini.net/2011/simple-usart-with-avr-libc
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <avr/io.h>
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#include <util/setbaud.h>
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#include "hardware.h"
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#include "uart.h"
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void uart_init(void)
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{
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UBRR0H = UBRRH_VALUE;
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UBRR0L = UBRRL_VALUE;
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#if USE_2X
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UCSR0A |= _BV(U2X0);
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#else
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UCSR0A &= ~(_BV(U2X0));
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#endif
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UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); /* 8-bit data */
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UCSR0B = _BV(RXEN0) | _BV(TXEN0); /* Enable RX and TX */
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}
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void uart_putchar(char c,
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FILE * stream)
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{
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if (c == '\n') {
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uart_putchar('\r', stream);
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}
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loop_until_bit_is_set(UCSR0A, UDRE0);
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UDR0 = c;
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}
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char uart_getchar(FILE * stream)
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{
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loop_until_bit_is_set(UCSR0A, RXC0); /* Wait until data exists. */
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return UDR0;
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}
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