Got the ARCNET datalink layer working

bacnet-stack/ports/linux/arcnet.c

@@ -1,3 +1,37 @@
+/*####COPYRIGHTBEGIN####
+ -------------------------------------------
+ Copyright (C) 2005 Steve Karg
+
+ 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.
+
+ As a special exception, if other files instantiate templates or
+ use macros or inline functions from this file, or you compile
+ this file and link it with other works to produce a work based
+ on this file, this file does not by itself cause the resulting
+ work to be covered by the GNU General Public License. However
+ the source code for this file must still be made available in
+ accordance with section (3) of the GNU General Public License.
+
+ This exception does not invalidate any other reasons why a work
+ based on this file might be covered by the GNU General Public
+ License.
+ -------------------------------------------
+####COPYRIGHTEND####*/
+
 #include <stdint.h>
 #include "bacdef.h"
 #include "arcnet.h"
@@ -12,6 +46,39 @@ static struct sockaddr ARCNET_Socket_Address;
 // Broadcast address
 #define ARCNET_BROADCAST 0
 
+/*
+Hints:  
+
+When using a PCI20-485D ARCNET card from Contemporary Controls,
+you might need to know about the following settings:
+
+Assuming a 20MHz clock on the COM20020 chip:
+
+clockp Clock Prescaler DataRate
+------ --------------- --------
+0           8          2.5 Mbps
+1           16         1.25 Mbps
+2           32         625 Kbps
+3           64         312.5 Kbps 
+4           128        156.25Kbps
+
+1. Install the arcnet driver and arcnet raw mode driver:
+# modprobe com20020_pci clockp=4
+# modprobe arc_rawmode
+
+2. Use ifconfig to bring up the interface
+# ifconfig arc0 up
+
+3. The hardware address (MAC address) is set using the dipswitch
+   on the back of the card.  0 is broadcast, so don't use 0.
+
+4. The backplane mode on the PCI20-485D card is done in hardware,
+   so the driver does not need to do backplane mode.  If you 
+   use another type of PCI20 card, you could pass in backplane=1 or 
+   backplane=0 as an option to the modprobe of com20020_pci.
+
+*/
+
 bool arcnet_valid(void)
 {
   return (ARCNET_Sock_FD >= 0);
@@ -31,7 +98,16 @@ static int arcnet_bind(char *interface_name)
   int sock_fd = -1; // return value
   struct ifreq ifr;
   int rv; // return value - error value from df or ioctl call
+  int uid = 0;
 
+  /* check to see if we are being run as root */
+  uid = getuid();
+  if (uid != 0) {             
+    fprintf(stderr,
+      "arcnet: Unable to open an af_packet socket.  "
+      "Try running with root priveleges.\n");
+    return sock_fd;
+  }
   fprintf(stderr,"arcnet: opening \"%s\"\n",interface_name);
   // note: on some systems you may have to add or enable in
   // modules.conf (or in modutils/alias on Debian with update-modules)
@@ -88,7 +164,18 @@ static int arcnet_bind(char *interface_name)
   rv = ioctl(sock_fd, SIOCGIFHWADDR, &ifr);
   if (rv != -1)            /* worked okay */
     ARCNET_MAC_Address = ifr.ifr_hwaddr.sa_data[0];
-  fprintf(stderr,"arcnet: MAC=%02Xh\n",ARCNET_MAC_Address);
+  // copy this info into the local copy since bind wiped it out
+  ARCNET_Socket_Address.sa_family = ARPHRD_ARCNET;
+  //ARCNET_Socket_Address.sa_family = PF_INET;
+  /* Clear the memory before copying */
+  memset(ARCNET_Socket_Address.sa_data, '\0',
+    sizeof(ARCNET_Socket_Address.sa_data));
+  /* Strcpy the interface name into the address */
+  strncpy(ARCNET_Socket_Address.sa_data, interface_name, 
+    sizeof(ARCNET_Socket_Address.sa_data)-1);
+  fprintf(stderr,"arcnet: MAC=%02Xh iface=\"%s\"\n",
+    ARCNET_MAC_Address,
+    ARCNET_Socket_Address.sa_data);
 
   atexit(arcnet_cleanup);
 
@@ -236,15 +323,18 @@ uint16_t arcnet_receive(
     if (received_bytes == 0)
       return 0;
 
-    printf("arcnet: received %u bytes from %02Xh (proto==%02Xh)\n",
-      received_bytes, pkt->hard.source, pkt->soft.raw[0]);
-                
+    /* printf("arcnet: received %u bytes (offset=%02Xh %02Xh) "
+        "from %02Xh (proto==%02Xh)\n",
+        received_bytes, pkt->offset[0], pkt->offset[1], 
+        pkt->hard.source, pkt->soft.raw[0]);
+    */
+    
     if (pkt->hard.source == ARCNET_MAC_Address) {
         fprintf(stderr,"arcnet: self sent packet?\n");
         return 0;
     }
     if (pkt->soft.raw[0] != 0xCD) {
-        fprintf(stderr,"arcnet: Non-BACnet packet.\n");
+        /* fprintf(stderr,"arcnet: Non-BACnet packet.\n"); */
         return 0;
     }
     if ((pkt->hard.dest != ARCNET_MAC_Address) && 

bacnet-stack/ports/linux/main.c

@@ -284,7 +284,7 @@ int main(int argc, char *argv[])
     {
       case 1:
         // used for testing, but kind of noisy on the network
-        // Read_Properties();
+        Read_Properties();
         break;
       case 2:
         break;