From 96adf87cd0268600ce0c4af348fb70f7ca464e02 Mon Sep 17 00:00:00 2001
From: Lu Wang <luwannest@users.noreply.github.com>
Date: Sat, 21 May 2016 14:20:05 +0800
Subject: [PATCH] add otPlatRadioGetCaps method to check radio capabilities
 (#53)

add doxygen for otRadioCaps

remove tmp file
---
 examples/platform/posix/radio.cpp |  5 +++++
 include/platform/radio.h          | 18 ++++++++++++++++++
 src/core/mac/mac.cpp              |  2 +-
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/examples/platform/posix/radio.cpp b/examples/platform/posix/radio.cpp
index 40a9ffce4..7da633da2 100644
--- a/examples/platform/posix/radio.cpp
+++ b/examples/platform/posix/radio.cpp
@@ -260,6 +260,11 @@ int8_t otPlatRadioGetNoiseFloor()
     return 0;
 }
 
+otRadioCaps otPlatRadioGetCaps()
+{
+    return kRadioCapsNone;
+}
+
 ThreadError otPlatRadioHandleTransmitDone(bool *rxPending)
 {
     ThreadError error = kThreadError_None;
diff --git a/include/platform/radio.h b/include/platform/radio.h
index a84e2b13d..fc38fe1a1 100644
--- a/include/platform/radio.h
+++ b/include/platform/radio.h
@@ -77,6 +77,17 @@ enum
     kPhyUsPerSymbol     = ((kPhyBitsPerOctet / kPhySymbolsPerOctet) * 1000000) / kPhyBitRate,
 };
 
+/**
+ *   This enum represents radio capabilities.
+ *
+ */
+
+typedef enum otRadioCaps
+{
+    kRadioCapsNone          = 0,  ///< None
+    kRadioCapsAckTimeout    = 1,  ///< Radio supports AckTime event
+} otRadioCaps;
+
 /**
  * This structure represents an IEEE 802.15.4 radio frame.
  */
@@ -272,6 +283,13 @@ ThreadError otPlatRadioHandleTransmitDone(bool *aFramePending);
  */
 int8_t otPlatRadioGetNoiseFloor(void);
 
+/**
+ * Get the radio capabilities.
+ *
+ * @returns The radio capability bit vector. The stack enables or disables some functions based on this value.
+ */
+otRadioCaps otPlatRadioGetCaps(void);
+
 /**
  * @}
  *
diff --git a/src/core/mac/mac.cpp b/src/core/mac/mac.cpp
index 025f4814d..159c60419 100644
--- a/src/core/mac/mac.cpp
+++ b/src/core/mac/mac.cpp
@@ -516,7 +516,7 @@ void Mac::HandleBeginTransmit(void)
 
     SuccessOrExit(error = otPlatRadioTransmit(&mSendFrame));
 
-    if (mSendFrame.GetAckRequest())
+    if (mSendFrame.GetAckRequest() && !(otPlatRadioGetCaps() & kRadioCapsAckTimeout))
     {
         mAckTimer.Start(kAckTimeout);
         otLogDebgMac("ack timer start\n");