73 lines
1.2 KiB
C
73 lines
1.2 KiB
C
#include <avr/io.h>
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#include <stdio.h>
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#ifndef F_CPU
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#define F_CPU 16000000UL
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#endif
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#ifndef BAUD
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#define BAUD 9600
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#endif
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#include <util/setbaud.h>
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/* http://www.cs.mun.ca/~rod/Winter2007/4723/notes/serial/serial.html */
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void uart0_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 uart3_init(void)
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{
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UBRR3H = UBRRH_VALUE;
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UBRR3L = UBRRL_VALUE;
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#if USE_2X
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UCSR3A |= _BV(U2X3);
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#else
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UCSR3A &= ~(_BV(U2X3));
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#endif
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UCSR3C = _BV(UCSZ31) | _BV(UCSZ30); /* 8-bit data */
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UCSR3B = _BV(TXEN3); /* Enable TX */
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}
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int uart0_putchar(char c, FILE *stream)
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{
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(void) stream;
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if (c == '\n') {
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uart0_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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return 0;
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}
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int uart3_putchar(char c, FILE *stream)
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{
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(void) stream;
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if (c == '\n') {
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uart3_putchar('\r', stream);
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}
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loop_until_bit_is_set(UCSR3A, UDRE3);
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UDR3 = c;
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return 0;
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}
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int uart0_getchar(FILE *stream)
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{
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(void) stream;
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loop_until_bit_is_set(UCSR0A, RXC0);
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return UDR0;
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}
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