103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/*
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* Copyright (c) 2007, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)$Id: slip_uart1.c,v 1.1 2007/02/02 13:13:16 bg- Exp $
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*/
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/*
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* Machine dependent AVR SLIP routines for UART1.
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*/
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#include <stdio.h>
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#include <avr/interrupt.h>
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#include "contiki.h"
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#include "dev/slip.h"
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static int
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slip_putchar(char c, FILE *stream)
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{
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#define SLIP_END 0300
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static char debug_frame = 0;
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if (!debug_frame) { /* Start of debug output */
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slip_arch_writeb(SLIP_END);
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slip_arch_writeb('\r'); /* Type debug line == '\r' */
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debug_frame = 1;
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}
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slip_arch_writeb((unsigned char)c);
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/*
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* Line buffered output, a newline marks the end of debug output and
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* implicitly flushes debug output.
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*/
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if (c == '\n') {
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slip_arch_writeb(SLIP_END);
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debug_frame = 0;
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}
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return c;
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}
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static FILE slip_stdout =
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FDEV_SETUP_STREAM(slip_putchar, NULL, _FDEV_SETUP_WRITE);
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void
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slip_arch_init(unsigned long ubr)
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{
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uint8_t dummy;
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spl_t s = splhigh();
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UBRR1L = ubr;
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UBRR1H = ubr >> 8; /* Always zero */
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UCSR1C = BV(UCSZ1) | BV(UCSZ0); /* 1 start bit, no parity, 1 stop bit */
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UCSR1B = BV(RXEN) | BV(TXEN) | BV(RXCIE);
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dummy = UDR1; /* Flush RX buffer. */
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splx(s);
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stdout = &slip_stdout;
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}
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void
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slip_arch_writeb(unsigned char c)
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{
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while (!(UCSR1A & BV(UDRE1)))
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;
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UDR1 = c;
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}
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ISR(SIG_UART1_RECV)
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{
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/* Should deal with receive errors. */
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slip_input_byte(UDR1);
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}
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