[Tinyos-2-commits] CVS: tinyos-2.x/tos/chips/cc2420/receive CC2420ReceiveP.nc, 1.6, 1.7

[dmm]

Update of /cvsroot/tinyos/tinyos-2.x/tos/chips/cc2420/receive
In directory sc8-pr-cvs10.sourceforge.net:/tmp/cvs-serv6612

Modified Files:
	CC2420ReceiveP.nc 
Log Message:
Added a comment about FIFOP

Index: CC2420ReceiveP.nc
===================================================================
RCS file: /cvsroot/tinyos/tinyos-2.x/tos/chips/cc2420/receive/CC2420ReceiveP.nc,v
retrieving revision 1.6
retrieving revision 1.7
diff -C2 -d -r1.6 -r1.7
*** CC2420ReceiveP.nc	17 Jan 2008 15:19:27 -0000	1.6
--- CC2420ReceiveP.nc	18 Jan 2008 18:36:00 -0000	1.7
***************
*** 395,398 ****
--- 395,408 ----
        
        atomic receivingPacket = FALSE;
+       
+       /*
+        * The FIFOP pin here is high when there are 0 bytes in the RX FIFO
+        * and goes low as soon as there are bytes in the RX FIFO.  The pin
+        * is inverted from what the datasheet says, and its threshold is 127.
+        * Whenever the FIFOP line goes low, as you can see from the interrupt
+        * handler elsewhere in this module, it means we received a new packet.
+        * If the line stays low without generating an interrupt, that means
+        * there's still more data to be received.
+        */
        if ( ( m_missed_packets && call FIFO.get() ) || !call FIFOP.get() ) {
          // A new packet is buffered up and ready to go