From 10086a4f56748586e320dad1437190109c16634e Mon Sep 17 00:00:00 2001
From: Li Cao <irvingcl@google.com>
Date: Fri, 13 Nov 2020 02:05:11 +0800
Subject: [PATCH] [low-power] fix csl simulation (#5785)

On nRF platform, otPlatRadioGetNow always gets the LSB part of an
uint64_t time. However, on simulation platform, this is not the
case. So in

  if (otPlatRadioGetNow(&GetInstance()) <
    mTransmitFrame.mInfo.mTxInfo.mTxDelayBaseTime +
      mTransmitFrame.mInfo.mTxInfo.mTxDelay)

we don't get the result expected. otPlatRadioGetNow(&GetInstance()) is
a very big number on simulation platform, and mTxDelayBaseTime is the
LSB part of the rx time.
---
 src/core/mac/sub_mac.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/core/mac/sub_mac.cpp b/src/core/mac/sub_mac.cpp
index 3424f118d..a4c32ecc9 100644
--- a/src/core/mac/sub_mac.cpp
+++ b/src/core/mac/sub_mac.cpp
@@ -356,8 +356,8 @@ void SubMac::StartCsmaBackoff(void)
 
         if (ShouldHandleTransmitTargetTime())
         {
-            if (otPlatRadioGetNow(&GetInstance()) <
-                mTransmitFrame.mInfo.mTxInfo.mTxDelayBaseTime + mTransmitFrame.mInfo.mTxInfo.mTxDelay)
+            if (Time(static_cast<uint32_t>(otPlatRadioGetNow(&GetInstance()))) <
+                Time(mTransmitFrame.mInfo.mTxInfo.mTxDelayBaseTime) + mTransmitFrame.mInfo.mTxInfo.mTxDelay)
             {
                 mTimer.StartAt(Time(mTransmitFrame.mInfo.mTxInfo.mTxDelayBaseTime),
                                mTransmitFrame.mInfo.mTxInfo.mTxDelay);