Re: [Tinyos-help] how to determine SACK packet

[Paolo]

Thanks David another question: the SACK_HEADER_LENGTH variables is set to 7 byte, Why ? FCF (2B) +  DSN(1B) +  FCS (2B) = 5B ??????? David Moss wrote: The FCF word contains a few bits that indicate the type of frame is an acknowledgment frame.  It is possible to receive a 5-byte packet that is not an ack frame but simply noise, where the CRC passes.  If the FCF word of a packet is an acknowledgment type, and the length is 5 bytes, then you probably have yourself a real acknowledgment frame.  Refer to the CC2420 datasheet for more details.   -David     From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Paolo Sent: Thursday, May 15, 2008 1:32 AM To: tinyos-help@millennium.berkeley.edu Subject: [Tinyos-help] how to determine SACK packet   Hello, How i can determine if a packet in RX fifo is a SACK packet ? If the cc2420_header_t->length is 5 bytes (2B FCF + 1B DSN + 2B FCS) i can say that is a SACK packet ? Thanks.

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