/* $Id$ */ /* * Copyright (c) 2011 Dimitri Sokolyuk * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #ifndef BAUD #define BAUD 9600 #endif #include #include #include #include #include /* depends on BAUD and F_CPU */ #include "kernel.h" #include "tasks.h" void uart_init(void) { FILE *uart_stream; UCSR0B = _BV(RXEN0) | _BV(TXEN0); UBRR0H = UBRRH_VALUE; UBRR0L = UBRRL_VALUE; #if USE_U2X UCSR0A |= _BV(U2X0); #else UCSR0A &= ~_BV(U2X0); #endif uart_stream = fdevopen(uart_putchar, uart_getchar); stdin = uart_stream; stdout = uart_stream; } int uart_putchar(char c, FILE *fd) { if (c == '\n') uart_putchar('\r', fd); loop_until_bit_is_set(UCSR0A, UDRE0); UDR0 = c; return 0; } int uart_getchar(FILE *fd) { char c; loop_until_bit_is_set(UCSR0A, RXC0); c = UDR0; if (bit_is_set(UCSR0A, FE0)) return -2; /* EOF */ if (bit_is_set(UCSR0A, DOR0)) return -1; /* ERR */ switch (c) { case '\r': c = '\n'; break; case '\t': c = ' '; break; default: break; } return c; }