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[sub-mac] use relative time when starting CSL TX delay (#10525)

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The original code uses the absolute time when staring the CSL TX delay
in `SubMac`. The timer is a `MicroTimer` and the absolute time comes
from the `mTxDelayBaseTime`. The `mTxDelayBaseTime` comes from the
radio time `otPlatRadioGetNow ()`, the time of `MicroTimer` should
come from `otPlatAlarmMicroGetNow()`. If the `MicroTimer` and the
radio are using different timer sources, it will cause the unexpected
issue.

This commit use the relative time when starting CSL TX delay to fix
this issue.
This commit is contained in:
Zhanglong Xia
2024-07-22 09:56:54 -07:00
committed by GitHub
parent 625b18630c
commit d0fbfb8c76
1 changed files with 3 additions and 2 deletions
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src/core/mac/sub_mac.cpp
+3 -2
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@@ -396,12 +396,13 @@ void SubMac::StartCsmaBackoff(void)
{
static constexpr uint32_t kAheadTime = kCcaSampleInterval + kCslTransmitTimeAhead + kRadioHeaderShrDuration;
Time txStartTime = Time(mTransmitFrame.mInfo.mTxInfo.mTxDelayBaseTime);
Time radioNow = Time(static_cast<uint32_t>(otPlatRadioGetNow(&GetInstance())));
txStartTime += (mTransmitFrame.mInfo.mTxInfo.mTxDelay - kAheadTime);
if (Time(static_cast<uint32_t>(otPlatRadioGetNow(&GetInstance()))) < txStartTime)
if (radioNow < txStartTime)
{
mTimer.FireAt(txStartTime);
StartTimer(txStartTime - radioNow);
}
else // Transmit without delay
{