139 lines
4.4 KiB
C
139 lines
4.4 KiB
C
/*
|
|
* 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-line.c,v 1.4 2010/02/23 18:26:26 adamdunkels Exp $
|
|
*/
|
|
#include "dev/serial-line.h"
|
|
#include <string.h> /* for memcpy() */
|
|
|
|
#include "lib/ringbuf.h"
|
|
|
|
#ifdef SERIAL_LINE_CONF_BUFSIZE
|
|
#define BUFSIZE SERIAL_LINE_CONF_BUFSIZE
|
|
#else /* SERIAL_LINE_CONF_BUFSIZE */
|
|
#define BUFSIZE 128
|
|
#endif /* SERIAL_LINE_CONF_BUFSIZE */
|
|
|
|
#if (BUFSIZE & (BUFSIZE - 1)) != 0
|
|
#error SERIAL_LINE_CONF_BUFSIZE must be a power of two (i.e., 1, 2, 4, 8, 16, 32, 64, ...).
|
|
#error Change SERIAL_LINE_CONF_BUFSIZE in contiki-conf.h.
|
|
#endif
|
|
|
|
#define IGNORE_CHAR(c) (c == 0x0d)
|
|
#define END 0x0a
|
|
|
|
static struct ringbuf rxbuf;
|
|
static uint8_t rxbuf_data[BUFSIZE];
|
|
|
|
PROCESS(serial_line_process, "Serial driver");
|
|
|
|
process_event_t serial_line_event_message;
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
serial_line_input_byte(unsigned char c)
|
|
{
|
|
static uint8_t overflow = 0; /* Buffer overflow: ignore until END */
|
|
|
|
if(IGNORE_CHAR(c)) {
|
|
return 0;
|
|
}
|
|
|
|
if(!overflow) {
|
|
/* Add character */
|
|
if(ringbuf_put(&rxbuf, c) == 0) {
|
|
/* Buffer overflow: ignore the rest of the line */
|
|
overflow = 1;
|
|
}
|
|
} else {
|
|
/* Buffer overflowed:
|
|
* Only (try to) add terminator characters, otherwise skip */
|
|
if(c == END && ringbuf_put(&rxbuf, c) != 0) {
|
|
overflow = 0;
|
|
}
|
|
}
|
|
|
|
/* Wake up consumer process */
|
|
process_poll(&serial_line_process);
|
|
return 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
PROCESS_THREAD(serial_line_process, ev, data)
|
|
{
|
|
static char buf[BUFSIZE];
|
|
static int ptr;
|
|
|
|
PROCESS_BEGIN();
|
|
|
|
serial_line_event_message = process_alloc_event();
|
|
ptr = 0;
|
|
|
|
while(1) {
|
|
/* Fill application buffer until newline or empty */
|
|
int c = ringbuf_get(&rxbuf);
|
|
|
|
if(c == -1) {
|
|
/* Buffer empty, wait for poll */
|
|
PROCESS_YIELD();
|
|
} else {
|
|
if(c != END) {
|
|
if(ptr < BUFSIZE-1) {
|
|
buf[ptr++] = (uint8_t)c;
|
|
} else {
|
|
/* Ignore character (wait for EOL) */
|
|
}
|
|
} else {
|
|
/* Terminate */
|
|
buf[ptr++] = (uint8_t)'\0';
|
|
|
|
/* Broadcast event */
|
|
process_post(PROCESS_BROADCAST, serial_line_event_message, buf);
|
|
|
|
/* Wait until all processes have handled the serial line event */
|
|
if(PROCESS_ERR_OK ==
|
|
process_post(PROCESS_CURRENT(), PROCESS_EVENT_CONTINUE, NULL)) {
|
|
PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_CONTINUE);
|
|
}
|
|
ptr = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
PROCESS_END();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
serial_line_init(void)
|
|
{
|
|
ringbuf_init(&rxbuf, rxbuf_data, sizeof(rxbuf_data));
|
|
process_start(&serial_line_process, NULL);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|