forked from Imagelibrary/uip
142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
/*
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* Copyright (c) 2001, Adam Dunkels.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Adam Dunkels.
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* 4. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This file is part of the uIP TCP/IP stack.
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*
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* $Id: slipdev.c,v 1.1 2001/11/20 20:49:45 adam Exp $
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*
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*/
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#include "uip.h"
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#define SLIP_END 0300
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#define SLIP_ESC 0333
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#define SLIP_ESC_END 0334
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#define SLIP_ESC_ESC 0335
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#define SIO_RECV(c) while(rs232_get(&c) == RS_ERR_NO_DATA)
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#define SIO_SEND(c) while(rs232_put(c) == RS_ERR_OVERFLOW)
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#define MAX_SIZE UIP_BUFSIZE
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static const unsigned char slip_end = SLIP_END,
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slip_esc = SLIP_ESC,
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slip_esc_end = SLIP_ESC_END,
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slip_esc_esc = SLIP_ESC_ESC;
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/*-----------------------------------------------------------------------------------*/
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void
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slipdev_send(void)
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{
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u8_t i;
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u8_t *ptr;
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u8_t c;
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SIO_SEND(slip_end);
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ptr = uip_buf;
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for(i = 0; i < uip_len; i++) {
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c = *ptr++;
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switch(c) {
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case SLIP_END:
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SIO_SEND(slip_esc);
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SIO_SEND(slip_esc_end);
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break;
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case SLIP_ESC:
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SIO_SEND(slip_esc);
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SIO_SEND(slip_esc_esc);
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break;
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default:
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SIO_SEND(c);
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break;
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}
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}
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SIO_SEND(slip_end);
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}
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/*-----------------------------------------------------------------------------------*/
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u8_t
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slipdev_read(void)
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{
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u8_t c;
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start:
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uip_len = 0;
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while(1) {
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if(uip_len >= MAX_SIZE) {
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goto start;
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}
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SIO_RECV(c);
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switch(c) {
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case SLIP_END:
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if(uip_len > 0) {
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return uip_len;
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} else {
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goto start;
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}
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break;
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case SLIP_ESC:
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SIO_RECV(c);
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switch(c) {
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case SLIP_ESC_END:
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c = SLIP_END;
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break;
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case SLIP_ESC_ESC:
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c = SLIP_ESC;
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break;
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}
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/* FALLTHROUGH */
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default:
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if(uip_len < MAX_SIZE) {
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uip_buf[uip_len] = c;
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uip_len++;
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}
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break;
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}
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}
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return 0;
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}
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/*-----------------------------------------------------------------------------------*/
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void
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slipdev_init(void)
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{
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}
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/*-----------------------------------------------------------------------------------*/
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