42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
#include <stdint.h> /* Standard Integer Types */
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#include <stdio.h> /* Standard IO facilities */
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#include <stdlib.h> /* General utilities */
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#include <avr/io.h> /* AVR device-specific IO definitions */
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#include "uart.h"
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#include <util/setbaud.h> /* Helper macros for baud rate calculations */
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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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FILE uart_io = FDEV_SETUP_STREAM(uart_putchar, uart_getchar, _FDEV_SETUP_RW);
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/* configure serial port */
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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 |= (1<<U2X0);
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#else
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UCSR0A &= ~(1<<U2X0);
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#endif
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UCSR0C = (1<<UCSZ01)|(1<<UCSZ00); /* 8N1 bit data */
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UCSR0B = (1<<RXEN0)|(1<<TXEN0); /* enable RX and TX */
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UCSR0B |= (1<<RXCIE0); /* enable RX complete interrupt */
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}
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void uart_putchar(char c, 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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