From 979965da13886883fe7399d60ff4d025f53bfd4c Mon Sep 17 00:00:00 2001
From: razvanm <razvanm>
Date: Mon, 1 Dec 2008 23:51:38 +0000
Subject: [PATCH] Add a comment about the polarity of FIFOP.

---
 tos/chips/cc2420/receive/CC2420ReceiveP.nc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tos/chips/cc2420/receive/CC2420ReceiveP.nc b/tos/chips/cc2420/receive/CC2420ReceiveP.nc
index 30a42191..b50ad035 100644
--- a/tos/chips/cc2420/receive/CC2420ReceiveP.nc
+++ b/tos/chips/cc2420/receive/CC2420ReceiveP.nc
@@ -126,6 +126,10 @@ implementation {
       reset_state();
       m_state = S_STARTED;
       atomic receivingPacket = FALSE;
+      /* Note:
+         We use the falling edge because the FIFOP polarity is reversed. 
+         This is done in CC2420Power.startOscillator from CC2420ControlP.nc.
+       */
       call InterruptFIFOP.enableFallingEdge();
     }
     return SUCCESS;
-- 
2.39.2