[Tinyos-devel] Problem with SFLUSHTX strobe on micaz and telosb

[Jun]

Hello All,

I recently observed some unexpected behavior of cc2420 radio, which happened
when I try to send a high priority packet that would cancel pending packet
that has been loaded to cc2420 TXFIFO.
(I'm sorry if you have received the duplicate message on tinyos-help.)

It seems that SFLUSHTX strobe does not flush the loaded data from TXFIFO.
I first called CSN.clr, SFLUSHTX.strobe, CSN.set to cancel the pending data
which is 40 bytes.
Then I wrote a new packet of 11 bytes (just cc2420 header) to TXFIFO using
loadTXFIFO and no error is observed.

The strange behavior from this point. After calling the STXONCC strobe,
a receiving node got a packet of 40 bytes rather than the newly loaded
packet
which is only 11 bytes. I ran same code on micaz and telosb and got exactly
the same results.

Did I do anything wrong when involving SFLUSHTX.strobe?
Does anyone have any idea on this strange behavior of cc2420?

Thanks in advance for your help,

Jun


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Mailto: yanjunrockets at gmail.com
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