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