contiki/core/dev/serial.c

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/*
* Copyright (c) 2005, Swedish Institute of Computer Science
* All rights reserved.
*
* 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 with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: serial.c,v 1.2 2006/07/03 11:29:16 nifi Exp $
*/
#include "serial.h"
#include <string.h> /* for memcpy() */
#ifdef SERIAL_CONF_BUFSIZE
#define BUFSIZE SERIAL_CONF_BUFSIZE
#else /* SERIAL_CONF_BUFSIZE */
#define BUFSIZE 40
#endif /* SERIAL_CONF_BUFSIZE */
#define IGNORE_CHAR(c) (c == 0x0d)
#define END 0x0a
static char buffer[BUFSIZE], appbuffer[BUFSIZE];
static volatile unsigned char bufwptr;
static volatile char buffer_full = 0;
PROCESS(serial_process, "Serial driver");
process_event_t serial_event_message;
/*---------------------------------------------------------------------------*/
int
serial_input_byte(unsigned char c)
{
if(!buffer_full && !IGNORE_CHAR(c)) {
if(c == END) {
/* terminate the string */
buffer[bufwptr++] = '\0';
buffer_full++;
process_poll(&serial_process);
return 1;
}
/* reserve space for the terminating zero character */
if(bufwptr < (BUFSIZE - 1)) {
buffer[bufwptr++] = c;
}
}
return 0;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(serial_process, ev, data)
{
PROCESS_BEGIN();
bufwptr = 0;
buffer_full = 0;
serial_event_message = process_alloc_event();
while(1) {
PROCESS_YIELD();
if(buffer_full) {
memcpy(appbuffer, buffer, bufwptr);
process_post(PROCESS_BROADCAST, serial_event_message, appbuffer);
bufwptr = 0;
buffer_full = 0;
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
void
serial_init(void)
{
process_start(&serial_process, NULL);
}
/*---------------------------------------------------------------------------*/