35 lines
806 B
C
35 lines
806 B
C
#include <avr/io.h>
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#include <stdio.h>
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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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FILE uart_output = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
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FILE uart_input = FDEV_SETUP_STREAM(NULL, uart_getchar, _FDEV_SETUP_READ);
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void uart_init(void) {
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UBRR0H = UBRRH_VALUE;
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UBRR0L = UBRRL_VALUE;
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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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int uart_putchar(char c, FILE *stream) {
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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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return 0;
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}
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int uart_getchar(FILE *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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