2008/9/25 Renee Azhen <[EMAIL PROTECTED]>
> hi, Razvan Musaloiu-E.,
> thanks for your nice help.
> I proposed this question is becuase that when I was using the tutorial code
> "EasyCollection" which used the sample routing protocol ctp, I found that if
> I set the flag CFLAGS += -DCC2420_NO_ACKNOWLEDGEMENTS in MakeFile, then the
> ctp protocol is almost failed.
>
> I greped in the ctp lib diretory, but not found there is some file used
> PacketAcknowledgements interface, could you help me to figure out why I set
> that flag will lead to the ctp protocol fail? thanks
>
> and another question, there are a big number of CFLAGS += -DCC2420_* flags
> in tinyos, could you tell me where I can find a file that list all the
> CFLAGS there?
the simplest way to determine this is to execute:
find . -exec grep -nHi -DCC2420 \{\} \;
eric
>
> great thanks
> Sam
>
> *"Razvan Musaloiu-E." <[EMAIL PROTECTED]>* 写道：
>
> Hi!
>
> On Thu, 25 Sep 2008, Renee Azhen wrote:
>
> > thanks, Razvan Musaloiu-E,
> > then what is the usage of CC2420_NO_ACKNOWLEDGEMENTS?
>
> The CC2420_NO_ACKNOWLEDGEMENTS will disable the sending of ACKs. The other
> directive related to ACKs is CC2420_HW_ACKNOWLEDGEMENTS which will disable
> the software ACKs and enable the hardware ones.
>
> > If a sender transmit a packet, then the receiver will reply with a ACK.
>
> If a sender does not request for ACKs then the received will not ACK the
> packet. If the packet requests for an ACK and the receiver has disabled
> the ACKS then again the ACK will not be sent.
>
> > So what interface the sender will use to receive the ACK?
> > and how does the sender process the ACK message?
> > Do you know some sample code about this flag? could you please share it
> with me?
>
> Actually there is such a problem already in the tree in this place:
> apps/tests/cc2420/TestAcks
>
> All the best!
> Razvan ME
>
> > "Razvan Musaloiu-E." 写道： Hi!
> >
> > On Wed, 24 Sep 2008, Renee Azhen wrote:
> >
> >> Does this flag(CC2420_NO_ACKNOWLEDGEMENTS) is used by mac/link layer?
> >> if the CC2420_NO_ACKNOWLEDGEMENTS was set, then no ack will be sent by
> >> receiver, so the receive.Done event will always return true?
> >
> > You are talking about AMSend.sendDone? AMSend.sendDone will not return a
> > fail even if the packet is not acked. To check for that you have to use
> > the wasAcked from the PacketAcknowledgements interface
> > (PacketAcknowledgements.nc from tos/interfaces). You also need to use the
> > requestAck from it before doing a AMSend.send of the packet.
> >
> > --
> > Razvan ME
> >
> >> Tony O'Donovan
> >> When a sender tranmits a message to a receiver the receiver can send an
> >> acknowledgment (ACK) message. The purpose of the ACK is to let the
> >> sender know the message was successfully received. If the
> >> CC2420_NO_ACKNOWLEDGEMENTS option is set the receiver does not send an
> >> ACK when it receives a message.
> >>
> >>
> >> --- Renee Azhen wrote:
> >>
> >>> hi, all,
> >>> I am using the collection protocol, and found that
> >>> if I use:
> >>> CFLAGS += -DCC2420_NO_ACKNOWLEDGEMENTS
> >>> CFLAGS += -DCC2420_NO_ADDRESS_RECOGNITION
> >>> in the app makfile, network almost failed, it can't
> >>> deliver any packet.
> >>>
> >>> So is there anyone know what is the usage of that
> >>> line in Makefile??
> >>>
> >>> thanks
> >>> Sam
> >>>
> >>>
> >
> >
> >
> > ---------------------------------
> > 雅虎邮箱，您的终生邮箱！
>
>
> ------------------------------
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--
Eric B. Decker
Senior (over 50 :-) Researcher
Autonomous Systems Lab
Jack Baskin School of Engineering
UCSC
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