nes-proj/cpu/z80/dev/rs232.c

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/*
* Copyright (c) 2007, Takahide Matsutsuka.
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* All rights reserved.
*
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* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
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* with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
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* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* 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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* $Id: rs232.c,v 1.5 2009/03/17 20:20:45 adamdunkels Exp $
*
*/
/*
* \file
* This is RS-232C process based on polling.
* Note that rs232.c and rs232-slip.c cannot be used at the same time.
* \author
* Takahide Matsutsuka <markn@markn.org>
*/
#include "contiki.h"
#include "dev/slip.h"
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#include "dev/serial-line.h"
#include "dev/rs232.h"
PROCESS(rs232_process, "RS-232C polling process");
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(rs232_process, ev, data)
{
static struct etimer timer;
char ch;
unsigned char i, stat;
PROCESS_BEGIN();
rs232_arch_init(RS232_BAUD_RATE);
etimer_set(&timer, CLOCK_SECOND / 16);
while(1) {
PROCESS_WAIT_EVENT();
if (etimer_expired(&timer)) {
for (i = 0; i < RS232_BUFSIZE; i++) {
ch = rs232_arch_poll(&stat);
if (stat == 0) {
break;
}
/* We have an input data */
RS232_CALLBACK(ch);
}
etimer_reset(&timer);
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/