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