X-Git-Url: https://oss.titaniummirror.com/gitweb/?a=blobdiff_plain;f=tos%2Flib%2Fmac%2Ftkn154%2FScanP.nc;h=37ac03b661bfd485c25c48ee5c125a90b3960de4;hb=35905c1cd223f9fbef7f5435b518dc34acfd3bef;hp=a92fc5ac9e42b99d9143b1bcfdbd84f939608508;hpb=079699a3ec5419479cc3bad49814ca06da91d196;p=tinyos-2.x.git

diff --git a/tos/lib/mac/tkn154/ScanP.nc b/tos/lib/mac/tkn154/ScanP.nc
index a92fc5ac..37ac03b6 100644
--- a/tos/lib/mac/tkn154/ScanP.nc
+++ b/tos/lib/mac/tkn154/ScanP.nc
@@ -272,21 +272,23 @@ implementation
       uint32_t unscannedChannels = 0;
 
       if (m_terminateScan){
-        // scan operation terminated prematurely because the max. 
-        // number of PAN descriptors/ED samples was reached
-        result = IEEE154_LIMIT_REACHED;
-
-        // mark the channel on which we received the last beacon
-        // as unscanned, because it was not completely scanned
+        // Scan operation terminated because the max. 
+        // number of PAN descriptors/ED samples was reached.
+        // Check if there are channels that were unscanned.
+        // In active/passive scan we consider a channel 
+        // unscanned if it was not completely scanned.
         if (m_scanType == PASSIVE_SCAN || m_scanType == ACTIVE_SCAN) 
-          currentChannelBit >>= 1;
+          currentChannelBit >>= 1; // last (partially) scanned channel
         while (!(currentChannelBit & INVALID_CHANNEL_BITMASK) &&
                (m_scanChannels & currentChannelBit)){
           unscannedChannels |= currentChannelBit;
           currentChannelBit <<= 1;
         }
+        if (unscannedChannels) // some channels were not (completely) scanned
+          result = IEEE154_LIMIT_REACHED;
       } else if (m_scanType != ENERGY_DETECTION_SCAN && !m_resultIndex)
         result = IEEE154_NO_BEACON;
+
       if (m_scanType == PASSIVE_SCAN || m_scanType == ACTIVE_SCAN) 
         call MLME_SET.macPANId(m_PANID);
       if (m_txFrame != NULL) {