+++ /dev/null
-/*
- * Copyright (c) 2011, Olivier MATZ <zer0@droids-corp.org>
- * All rights reserved.
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * 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.
- * * Neither the name of the University of California, Berkeley 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 REGENTS 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 REGENTS AND 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.
- */
-
-#include <aversive.h>
-#include <aversive/pgmspace.h>
-#include <aversive/queue.h>
-#include <aversive/endian.h>
-
-#include <uart.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <string.h>
-#include <ctype.h>
-
-#include "xbee_neighbor.h"
-#include "xbee_stats.h"
-#include "xbee_buf.h"
-#include "xbee_proto.h"
-#include "xbee.h"
-
-/* return -1 if the frame is invalid */
-static int xbee_proto_parse_atresp(struct xbee_dev *dev, void *buf,
- unsigned len)
-{
- struct xbee_atresp_hdr *atresp_hdr;
-
- dev->stats.rx_atresp++;
-
- if (len < sizeof(struct xbee_hdr) + sizeof(struct xbee_atresp_hdr)) {
- dev->stats.rx_frame_too_small++;
- return -1;
- }
-
- atresp_hdr = buf + sizeof(struct xbee_hdr);
-
- /* bad status, but let the frame continue */
- if (atresp_hdr->status != 0)
- dev->stats.rx_atresp_error++;
-
- return 0;
-}
-
-/* return -1 if the frame is invalid */
-static int xbee_proto_parse_rmt_atresp(struct xbee_dev *dev, void *buf,
- unsigned len)
-{
- struct xbee_rmt_atresp_hdr *rmt_atresp_hdr;
-
- dev->stats.rx_rmt_atresp++;
-
- if (len < sizeof(struct xbee_hdr) + sizeof(struct xbee_rmt_atresp_hdr)) {
- dev->stats.rx_frame_too_small++;
- return -1;
- }
-
- rmt_atresp_hdr = buf + sizeof(struct xbee_hdr);
-
- /* bad status, but let the frame continue */
- if (rmt_atresp_hdr->status != 0)
- dev->stats.rx_rmt_atresp_error++;
-
- return 0;
-}
-
-/* return -1 if the frame is invalid */
-static int xbee_proto_parse_xmit_status(struct xbee_dev *dev, void *buf,
- unsigned len)
-{
- struct xbee_xmit_status_hdr *xmit_status_hdr;
-
- dev->stats.rx_xmit_status++;
-
- if (len < sizeof(struct xbee_hdr) + sizeof(struct xbee_xmit_status_hdr)) {
- dev->stats.rx_frame_too_small++;
- return -1;
- }
-
- xmit_status_hdr = buf + sizeof(struct xbee_hdr);
- dev->stats.tx_xmit_retries += xmit_status_hdr->xmit_retry_cnt;
-
- /* bad status, but let the frame continue */
- if (xmit_status_hdr->delivery_status != 0)
- dev->stats.rx_xmit_status_error++;
-
- return 0;
-}
-
-/* parse the frame stored in the device: return 0 if the frame is
- * valid, else a negative value */
-static int xbee_proto_parse_frame(struct xbee_dev *dev)
-{
- void *buf = dev->frame;
- uint8_t len = dev->frame_len;
- uint8_t hdrlen;
- struct xbee_hdr *hdr = buf;
- int i;
- uint8_t cksum = 0;
- int channel = XBEE_DEFAULT_CHANNEL;
-
- dev->stats.rx_frame++;
-
- switch (hdr->type) {
- case XBEE_TYPE_MODEM_STATUS:
- case XBEE_TYPE_RECV:
- case XBEE_TYPE_EXPL_RECV:
- hdrlen = sizeof(struct xbee_hdr) - 1; /* no frame ID */
- break;
- default:
- hdrlen = sizeof(struct xbee_hdr);
- break;
- }
-
- /* check frame len */
- if (len < (hdrlen + 1)) {
- dev->stats.rx_frame_too_small++;
- fprintf_P(stderr, PSTR("Frame too small\r\n"));
- return -1;
- }
-
- /* validate the cksum */
- for (i = 3; i < (len - 1); i++)
- cksum += ((uint8_t *)buf)[i];
- cksum = 0xff - cksum;
- if (cksum != ((uint8_t *)buf)[len-1]) {
- fprintf_P(stderr, PSTR("Invalid cksum\r\n"));
- dev->stats.rx_invalid_cksum++;
- return -1;
- }
-
- /* dispatch */
- switch (hdr->type) {
- case XBEE_TYPE_MODEM_STATUS:
- dev->stats.rx_modem_status++;
- channel = XBEE_DEFAULT_CHANNEL;
- break;
- case XBEE_TYPE_ATRESP:
- if (xbee_proto_parse_atresp(dev, buf, len) < 0)
- return -1;
- channel = hdr->id;
- break;
- case XBEE_TYPE_RMT_ATRESP:
- if (xbee_proto_parse_rmt_atresp(dev, buf, len) < 0)
- return -1;
- channel = hdr->id;
- break;
- case XBEE_TYPE_XMIT_STATUS:
- if (xbee_proto_parse_xmit_status(dev, buf, len) < 0)
- return -1;
- channel = hdr->id;
- break;
- case XBEE_TYPE_RECV:
- dev->stats.rx_data++;
- channel = XBEE_DEFAULT_CHANNEL;
- break;
- case XBEE_TYPE_EXPL_RECV:
- dev->stats.rx_expl_data++;
- channel = XBEE_DEFAULT_CHANNEL;
- break;
- case XBEE_TYPE_NODE_ID:
- dev->stats.rx_node_id++;
- channel = hdr->id; //XXX
- break;
- /* invalid commands */
- case XBEE_TYPE_ATCMD:
- case XBEE_TYPE_ATCMD_Q:
- case XBEE_TYPE_XMIT:
- case XBEE_TYPE_EXPL_XMIT:
- case XBEE_TYPE_RMT_ATCMD:
- default:
- dev->stats.rx_invalid_type++;
- break;
- }
-
- /* fallback to default channel if not registered */
- if (channel < 0 || channel >= XBEE_MAX_CHANNEL ||
- dev->channel[channel].registered == 0)
- channel = XBEE_DEFAULT_CHANNEL;
-
- /* execute the callback if any */
- if (dev->channel[channel].rx_cb != NULL)
- dev->channel[channel].rx_cb(dev, channel, hdr->type,
- buf + hdrlen,
- len - hdrlen - 1,
- dev->channel[channel].arg);
-
- return 0;
-}
-
-int xbee_proto_xmit(struct xbee_dev *dev, uint8_t channel_id, uint8_t type,
- void *buf, unsigned len)
-{
- struct xbee_hdr hdr;
- unsigned i;
- uint8_t cksum = 0;
-
- /* there is no empty message, so return an error */
- if (len == 0)
- return -1;
-
- /* prepare an iovec to avoid a copy: prepend a header to the
- * buffer and append a checksum */
- hdr.delimiter = XBEE_DELIMITER;
- hdr.len = htons(len + 2);
- hdr.type = type;
- hdr.id = channel_id;
-
- if (channel_id >= XBEE_MAX_CHANNEL ||
- dev->channel[channel_id].registered == 0) {
- dev->stats.tx_invalid_channel ++;
- return -1;
- }
-
- /* calculate the cksum */
- cksum = hdr.type;
- cksum += hdr.id;
- for (i = 0; i < len; i++)
- cksum += ((uint8_t *)buf)[i];
- cksum = 0xff - cksum;
- dev->stats.tx_frame ++;
-
- /* some additional checks before sending */
- switch (hdr.type) {
-
- case XBEE_TYPE_ATCMD:
- // XXX some checks ?
- dev->stats.tx_atcmd ++;
- break;
- case XBEE_TYPE_ATCMD_Q:
- dev->stats.tx_atcmd_q ++;
- break;
- case XBEE_TYPE_XMIT:
- dev->stats.tx_data ++;
- break;
- case XBEE_TYPE_EXPL_XMIT:
- dev->stats.tx_expl_data ++;
- break;
- case XBEE_TYPE_RMT_ATCMD:
- dev->stats.tx_rmt_atcmd ++;
- break;
-
- /* invalid commands */
- case XBEE_TYPE_XMIT_STATUS:
- case XBEE_TYPE_MODEM_STATUS:
- case XBEE_TYPE_ATRESP:
- case XBEE_TYPE_RECV:
- case XBEE_TYPE_EXPL_RECV:
- case XBEE_TYPE_NODE_ID:
- case XBEE_TYPE_RMT_ATRESP:
- default:
- dev->stats.tx_invalid_type ++;
- fprintf_P(stderr, PSTR("unhandled xmit type=%x\r\n"),
- hdr.type);
- return -1;
- }
-
- /* send the frame on the wire */
- fwrite((uint8_t *)&hdr, 1, sizeof(hdr), dev->file);
- fwrite((uint8_t *)buf, 1, len, dev->file);
- fwrite(&cksum, 1, 1, dev->file);
-
- return 0;
-}
-
-void xbee_proto_rx(struct xbee_dev *dev)
-{
- uint8_t framelen;
- struct xbee_hdr *hdr = (struct xbee_hdr *)dev->frame;
- int c;
-
- while (1) {
-
- /* read from UART */
- c = fgetc(dev->file);
- if (c == EOF)
- break;
-
- /* frame too long XXX stats */
- if (dev->frame_len >= XBEE_MAX_FRAME_LEN) {
- dev->frame_len = 0;
- continue;
- }
-
- if (dev->frame_len == 0 && c != XBEE_DELIMITER)
- continue;
-
- dev->frame[dev->frame_len++] = c;
-
- /* not enough data to read len */
- if (dev->frame_len < sizeof(*hdr))
- continue;
-
- framelen = ntohs(hdr->len);
- framelen += 4; /* 1 for delimiter, 2 for len, 1 for cksum */
-
- /* frame too long XXX stats */
- if (framelen >= XBEE_MAX_FRAME_LEN) {
- dev->frame_len = 0;
- continue;
- }
-
- /* not enough data */
- if (dev->frame_len < framelen)
- continue;
- if (xbee_proto_parse_frame(dev) < 0) {
- ;//XXX stats
- }
- dev->frame_len = 0;
- }
-}
git.droids-corp.org / protos / xbee-avr.git / blobdiff