[Tinyos-help] Payload length influence on energy consumption and padding

[delphine christin]

Hello, Thanks for your answer. I have found the solution to my problem.I am using a structure including an array of data and its length is fixed. When I called AMSend.send(), the last parameter was the length of the structure and not the size of my payload, which may vary.By modifing it, it works very well and there is no more padding. Best,DelphineC> Date: Thu, 11 Dec 2008 14:51:53 -0800> From: zainul at ee.ucla.edu> To: felodine22 at hotmail.com> Subject: Re: [Tinyos-help] Payload length influence on energy consumption and padding> CC: tinyos-help at millennium.berkeley.edu> > Hi Delphine,> > Avrora tries to emulate the behavior of the chips as much as possible.> A Mica2 radio is byte based and I know of no routine in Avrora that> adds padding bytes. I believe the padding comes from TinyOS's packet> management. Try changing the value of TOSH_DATA_LENGTH in> tos/types/message.h to see the effect on padding.> > Zainul.> > On Thu, Dec 11, 2008 at 1:02 PM, delphine christin> <felodine22 at hotmail.com> wrote:> > Hello,> >> >> > I would like to show that the payload length influences the radio energy> > consumption. For example, a 4 byte payload requires less power to be sent> > than a 28 byte payload. In order to show it, I use the following scenario:> >> > -Boot.booted: get the data to send and switch the radio on> > -start.done: send the data> > -send.done: stop the radio> > -stop.done: start a timer> > -timer.fired: start the radio> >> > I have already tested this scenario with Avrora and AEON. But unfortunately,> > the radio energy is constant for amount of data between 1 and 10 bytes and> > then jumps to another value between 10 and 29 bytes.> > I have checked the packet with the -monitors=packets option and observe> > padding.> >> > (1) Is this padding specific to this simulator? or to TinyOS ? or both?> >> > (2) Has Power Tossim the same behavior concerning padding?> >> > (3) I foresee to use breakpoints and the energy given by the data sheets to> > obtain the consumption from the CPU and the radio. Do you have any advices> > or better ideas?> >> > Thanks a lot in advance,> >> > Best regards> >> > DelphineC> >> > ________________________________> > Votre correspondant a choisi Hotmail et profite d'un stockage quasiment> > illimité. Créez un compte Hotmail gratuitement !> > _______________________________________________> > Tinyos-help mailing list> > Tinyos-help at millennium.berkeley.edu> > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help> >

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