void Mac::HandleBeginTransmit(void)
{
ThreadError error = kThreadError_None;
if (otPlatRadioIdle() != kThreadError_None)
{
mBeginTransmit.Post();
ExitNow();
}
switch (mState)
{
case kStateActiveScan:
mSendFrame.SetChannel(mScanChannel);
SendBeaconRequest(mSendFrame);
mSendFrame.SetSequence(0);
break;
case kStateTransmitBeacon:
mSendFrame.SetChannel(mChannel);
SendBeacon(mSendFrame);
mSendFrame.SetSequence(mBeaconSequence++);
break;
case kStateTransmitData:
mSendFrame.SetChannel(mChannel);
SuccessOrExit(error = mSendHead->HandleFrameRequest(mSendFrame));
mSendFrame.SetSequence(mDataSequence);
break;
default:
assert(false);
break;
}
// Security Processing
ProcessTransmitSecurity();
SuccessOrExit(error = otPlatRadioTransmit(&mSendFrame));
if (mSendFrame.GetAckRequest() && !(otPlatRadioGetCaps() & kRadioCapsAckTimeout))
{
mAckTimer.Start(kAckTimeout);
otLogDebgMac("ack timer start\n");
}
exit:
if (error != kThreadError_None)
{
assert(false);
}
}
otError LinkRaw::DoTransmit(otRadioFrame *aFrame)
{
otError error = otPlatRadioTransmit(&mInstance, aFrame);
#if OPENTHREAD_CONFIG_ENABLE_SOFTWARE_ACK_TIMEOUT
// If we are implementing the ACK timeout logic, start a timer here (if ACK request)
// to fire if we don't get a transmit done callback in time.
if (static_cast<Mac::Frame *>(aFrame)->GetAckRequest())
{
otLogDebgPlat(aInstance, "LinkRaw Starting AckTimeout Timer");
mTimerReason = kTimerReasonAckTimeout;
mTimer.Start(Mac::kAckTimeout);
}
#endif
return error;
}