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SFD Flag in PKTSTATUS CC111x

Heelllo .....

I am trying to do rf communication using two cc1110 ICs.. I have used the register values from RF Studio for 30/32 bit sync,variable packet length.And when i am doing the IRQ_DONE flag of RFIF Flag is setting,There by I am confirming that transmission is happening.

And coming to the reception side , The code i used is as follows.

RFST = RFST_SRX; 

while(1)

while(!RFTXRXIF); 
RFTXRXIF = 0; 
rxdata = RFD; 

LED_ON;
}

I have made a LED to glow if RFTXRXIF FLAG goes high atleast once.But this is not happening at all....So I checked whether it is receiving Sync byte by checking the SFD flag of PKTSTATUS register.But even that is not setting.So what may be the problem...????

PLease help me ....