60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/* This is part of the LED light controller program.
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* It handles the USART configuration
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*/
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#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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