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.
_______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
