Contiki 2.6

rs232.c

00001 /*
00002  * Copyright (c) 2007, Takahide Matsutsuka.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above
00011  *    copyright notice, this list of conditions and the following
00012  *    disclaimer in the documentation and/or other materials provided
00013  *    with the distribution.
00014  * 3. The name of the author may not be used to endorse or promote
00015  *    products derived from this software without specific prior
00016  *    written permission.
00017  *
00018  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
00019  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
00020  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00021  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
00022  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00023  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
00024  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00025  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
00026  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00027  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00028  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00029  *
00030  * $Id: rs232.c,v 1.5 2009/03/17 20:20:45 adamdunkels Exp $
00031  *
00032  */
00033 /*
00034  * \file
00035  *      This is RS-232C process based on polling.
00036  *      Note that rs232.c and rs232-slip.c cannot be used at the same time.
00037  * \author
00038  *      Takahide Matsutsuka <markn@markn.org>
00039  */
00040 
00041 #include "contiki.h"
00042 #include "dev/slip.h"
00043 #include "dev/serial-line.h"
00044 #include "dev/rs232.h"
00045 
00046 PROCESS(rs232_process, "RS-232C polling process");
00047 /*---------------------------------------------------------------------------*/
00048 PROCESS_THREAD(rs232_process, ev, data)
00049 {
00050   static struct etimer timer;
00051   char ch;
00052   unsigned char i, stat;
00053   PROCESS_BEGIN();
00054 
00055   rs232_arch_init(RS232_BAUD_RATE);
00056   etimer_set(&timer, CLOCK_SECOND / 16);
00057 
00058   while(1) {
00059     PROCESS_WAIT_EVENT();
00060 
00061     if (etimer_expired(&timer)) {
00062       for (i = 0; i < RS232_BUFSIZE; i++) {
00063         ch = rs232_arch_poll(&stat);
00064         if (stat == 0) {
00065           break;
00066         }
00067         /* We have an input data */
00068         RS232_CALLBACK(ch);
00069       }
00070       etimer_reset(&timer);
00071     }
00072   }
00073 
00074   PROCESS_END();
00075 }
00076 /*---------------------------------------------------------------------------*/