220 lines
6.8 KiB
C
220 lines
6.8 KiB
C
/* packet-sercosiii_1v1_at.c
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* Routines for SERCOS III dissection
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include "packet-sercosiii.h"
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static gint ett_siii_at = -1;
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static gint ett_siii_at_svc = -1;
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static gint ett_siii_at_devstats = -1;
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static gint ett_siii_at_svc_channel[MAX_SERCOS_DEVICES];
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static gint ett_siii_at_dev_status[MAX_SERCOS_DEVICES];
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static void dissect_siii_at_cp0(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
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{
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guint16 seqcnt; /* sequence counter */
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guint16 tfield; /* topology field for sercos addresses */
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guint16 i;
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char devices[]="Recognized Devices"; /* fixme: it would be nice to have this as subtree */
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static char outbuf[200];
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proto_tree_add_text(tree, tvb, 0, 1024, "%s", devices);
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/* check sequence count field */
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seqcnt = tvb_get_letohs(tvb, 0);
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g_snprintf(outbuf, sizeof(outbuf), "Number of Devices: %u", (0x1FF & seqcnt)-1);
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proto_tree_add_text(tree, tvb, 0, 2, "%s", outbuf);
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/* check SERCOS address of each topology field */
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for(i=1;i < MAX_SERCOS_DEVICES; ++i)
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{
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tfield = tvb_get_letohs(tvb, i*2);
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if(tfield == 0)
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{
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g_snprintf(outbuf, sizeof(outbuf), "Device Address %u: No SERCOS Address", i);
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}
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else if(tfield == 0xFFFF)
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{
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g_snprintf(outbuf, sizeof(outbuf), "Device Address %u: No Device", i);
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}
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else
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{
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g_snprintf(outbuf, sizeof(outbuf), "Device Address %u: %u", i, tfield);
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}
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proto_tree_add_text(tree, tvb, i*2, 2, "%s", outbuf);
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}
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}
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static void dissect_siii_at_cp1_2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint telno)
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{
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guint devstart = telno * 128; /* AT0: slaves 0-127; AT1: slaves 128-255; ... */
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tvbuff_t* tvb_n;
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guint idx;
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proto_item* ti; /* temporary item */
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proto_tree* subtree;
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proto_tree* subtree_svc;
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proto_tree* subtree_devstat;
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ti = proto_tree_add_text(tree, tvb, 0, 128 * 6, "Service Channel");
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subtree_svc = proto_item_add_subtree(ti, ett_siii_at_svc);
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ti = proto_tree_add_text(tree, tvb, 128 * 6, 512, "Device Status");
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subtree_devstat = proto_item_add_subtree(ti, ett_siii_at_devstats);
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for(idx = 0; idx < 128; ++idx) /* each AT of CP1/2 has data of 128 different slaves */
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{
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tvb_n = tvb_new_subset(tvb, 6 * idx, 6, 6); /* subset for service channel data */
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ti = proto_tree_add_text(subtree_svc, tvb_n, 0, 6, "Device %u", idx + devstart);
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subtree = proto_item_add_subtree(ti, ett_siii_at_svc_channel[idx]);
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dissect_siii_at_svc(tvb_n, pinfo, subtree, idx + devstart);
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tvb_n = tvb_new_subset(tvb, 128 * 6 + 4 * idx, 2, 2); /* subset for device status information */
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ti = proto_tree_add_text(subtree_devstat, tvb_n, 0, 2, "Device %u", idx + devstart);
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subtree = proto_item_add_subtree(ti, ett_siii_at_dev_status[idx]);
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dissect_siii_at_devstat(tvb_n, pinfo, subtree);
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}
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}
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static void dissect_siii_at_cp3_4(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint telno)
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{
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proto_item* ti;
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proto_tree* subtree_svc;
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proto_tree* subtree_devstat;
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if(0 == telno) /* dissect hotplug field in AT0 only */
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dissect_siii_at_hp(tvb, pinfo, tree);
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/* offsets of service channel, device status and connections are unknown
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* this data could be extracted from svc communication during CP2
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*/
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ti = proto_tree_add_text(tree, tvb, 0, 0, "Service Channels");
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subtree_svc = proto_item_add_subtree(ti, ett_siii_at_svc);
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ti = proto_tree_add_text(tree, tvb, 0, 0, "Device Status");
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subtree_devstat = proto_item_add_subtree(ti, ett_siii_at_devstats);
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}
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void dissect_siii_at(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item* ti; /* temporary item */
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proto_tree* subtree;
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tvbuff_t* tvb_n;
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guint8 phase;
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guint telno;
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phase = (tvb_get_guint8(tvb, 1)&0x8F); /* read communication phase out of SERCOS III header*/
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telno = (tvb_get_guint8(tvb, 0) & 0xF); /* read number of AT out of SERCOS III header */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "SIII AT");
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if(check_col(pinfo->cinfo, COL_INFO))
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{
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if(phase & 0x80) /* communication phase switching in progress */
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{
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col_append_fstr(pinfo->cinfo, COL_INFO, " Phase=CP?s -> CP%u",
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(phase&0x0f));
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}
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else /* communication as usual */
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{
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col_append_fstr(pinfo->cinfo, COL_INFO, " Phase=CP%u",
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(phase&0x0f));
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}
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}
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ti = proto_tree_add_text(tree, tvb, 0, -1, "AT%u", telno);
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subtree = proto_item_add_subtree(ti, ett_siii_at);
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dissect_siii_mst(tvb, pinfo, subtree); /* dissect SERCOS III header */
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switch(phase) /* call the AT dissector depending on the current communication phase */
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{
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case COMMUNICATION_PHASE_0: /* CP0 */
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tvb_n = tvb_new_subset(tvb, 6, 1024, 1024);
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dissect_siii_at_cp0(tvb_n, pinfo, subtree);
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break;
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case COMMUNICATION_PHASE_1: /* CP1 */
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case COMMUNICATION_PHASE_2: /* CP2 */
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tvb_n = tvb_new_subset(tvb, 6, 1280, 1280);
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dissect_siii_at_cp1_2(tvb_n, pinfo, subtree, telno);
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break;
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case COMMUNICATION_PHASE_3: /* CP3 */
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case COMMUNICATION_PHASE_4: /* CP4 */
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tvb_n = tvb_new_subset_remaining(tvb, 6);
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dissect_siii_at_cp3_4(tvb_n, pinfo, subtree, telno);
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break;
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default:
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proto_tree_add_text(tree, tvb, 6, -1, "CP is unknown");
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break;
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}
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}
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void dissect_siii_at_init(gint proto_siii _U_)
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{
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gint idx;
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_siii_at,
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&ett_siii_at_svc,
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&ett_siii_at_devstats
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};
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gint* etts[MAX_SERCOS_DEVICES];
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for(idx = 0; idx < MAX_SERCOS_DEVICES; ++idx)
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{
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ett_siii_at_svc_channel[idx] = -1;
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etts[idx] = &ett_siii_at_svc_channel[idx];
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}
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proto_register_subtree_array(etts, array_length(etts));
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for(idx = 0; idx < MAX_SERCOS_DEVICES; ++idx)
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{
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ett_siii_at_dev_status[idx] = -1;
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etts[idx] = &ett_siii_at_dev_status[idx];
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}
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proto_register_subtree_array(etts, array_length(etts));
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/* Required function calls to register the header fields and subtrees used */
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proto_register_subtree_array(ett, array_length(ett));
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}
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