104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
/*
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* Copyright (c) 2005, 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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* This file is part of the Contiki operating system.
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*
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* @(#)$Id: serial.c,v 1.2 2006/07/03 11:29:16 nifi Exp $
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*/
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#include "serial.h"
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#include <string.h> /* for memcpy() */
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#ifdef SERIAL_CONF_BUFSIZE
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#define BUFSIZE SERIAL_CONF_BUFSIZE
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#else /* SERIAL_CONF_BUFSIZE */
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#define BUFSIZE 40
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#endif /* SERIAL_CONF_BUFSIZE */
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#define IGNORE_CHAR(c) (c == 0x0d)
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#define END 0x0a
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static char buffer[BUFSIZE], appbuffer[BUFSIZE];
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static volatile unsigned char bufwptr;
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static volatile char buffer_full = 0;
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PROCESS(serial_process, "Serial driver");
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process_event_t serial_event_message;
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/*---------------------------------------------------------------------------*/
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int
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serial_input_byte(unsigned char c)
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{
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if(!buffer_full && !IGNORE_CHAR(c)) {
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if(c == END) {
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/* terminate the string */
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buffer[bufwptr++] = '\0';
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buffer_full++;
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process_poll(&serial_process);
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return 1;
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}
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/* reserve space for the terminating zero character */
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if(bufwptr < (BUFSIZE - 1)) {
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buffer[bufwptr++] = c;
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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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PROCESS_THREAD(serial_process, ev, data)
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{
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PROCESS_BEGIN();
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bufwptr = 0;
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buffer_full = 0;
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serial_event_message = process_alloc_event();
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while(1) {
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PROCESS_YIELD();
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if(buffer_full) {
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memcpy(appbuffer, buffer, bufwptr);
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process_post(PROCESS_BROADCAST, serial_event_message, appbuffer);
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bufwptr = 0;
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buffer_full = 0;
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}
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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void
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serial_init(void)
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{
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process_start(&serial_process, NULL);
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}
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/*---------------------------------------------------------------------------*/
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