[Tinyos-help] How to control the radio power in iris platform?

[Dan]

I found RF230LayerC.nc and RF230LayerP.nc had been updated recently to
support RSSI.

BTW, thanks for your link. The slides are very helpful.


On 5/16/08, Paul Stickney <pstickne at gmail.com> wrote:
> LQI is in relation to how many code-bits are "good" AFAIK. For
> distance, even questionable RSSI readings seem more ... well, useful.
>
> sing.stanford.edu/talks/emnets2006.ppt
>
> has some pretty graphics of LQI values. It's not too pretty. (Well,
> the "conclusion", and that was even from a localization
> perspective...)
>
> On Mon, May 12, 2008 at 9:11 AM, Dan <neikuer02 at gmail.com> wrote:
> > Janos,
> >
> > Thank you so much. I did something to measure the distance by RSSI on
> > MICAZ and now I wanna do the same thing on IRIS. LQI seems prone to
> > err compared with RSSI.
> >
> > ~Dan
> >
> > On 5/12/08, Janos Sallai <sallai at isis.vanderbilt.edu> wrote:
> >> Dan,
> >>
> >> Currently the rf230 stack does not support reading the RSSI. According
> >> to the rf230 datasheet (page 52.): "Note, it is not recommended to read
> >> the RSSI value when using the Extended
> >> Operating Mode." (the radio stack is using the extended operating mode)
> >>
> >> Depending on what you want to do, you might want to use the LQI value
> >> instead. Or, you can try reading the RSSI value from the register
> >> directly, but keep your fingers crossed...
> >>
> >> Janos
> >>
> >> -----Original Message-----
> >> From: tinyos-help-bounces at millennium.berkeley.edu
> >> [mailto:tinyos-help-bounces at millennium.berkeley.edu] On Behalf Of Dan
> >> Sent: Sunday, May 11, 2008 8:14 PM
> >> To: tinyos-help at millennium.berkeley.edu
> >> Subject: Re: [Tinyos-help] How to control the radio power in iris
> >> platform?
> >>
> >> Thanks for your info. Actually I'm also doing the same stuff. I have
> >> another question: how to get RSSI value of received packets? It's easy
> >> to get this info for micaz(cc2420), but I can't find related functions
> >> in the directory RF230. Do I have to read the register directly?
> >> Thanks!
> >>
> >> ~Dan
> >>
> >> On 5/11/08, Janos Sallai <sallai at isis.vanderbilt.edu> wrote:
> >> >
> >> >
> >> >
> >> > In my previous mail I meant:
> >> >
> >> >
> >> >
> >> > "If you _always_ want to send with some predefined transmit power, you
> >> need
> >> > to define the RF230_DEF_RFPOWER preprocessor variable (e.g. by adding
> >> > PFLAGS+=-DRF230_DEF_RFPOWER=9 to your Makefile)."
> >> >
> >> >
> >> >
> >> > Janos
> >> >
> >> >
> >> >
> >> >
> >> > From: tinyos-help-bounces at millennium.berkeley.edu
> >> > [mailto:tinyos-help-bounces at millennium.berkeley.edu] On
> >> > Behalf Of Janos Sallai
> >> > Sent: Sunday, May 11, 2008 3:23 PM
> >> > To: Xiaojun Zhu; tinyos-help at millennium.berkeley.edu
> >> > Subject: Re: [Tinyos-help] How to control the radio power in iris
> >> platform?
> >> >
> >> >
> >> >
> >> >
> >> > Xiaojun,
> >> >
> >> >
> >> >
> >> > If you _always_ want to send with some predefined transmit power, you
> >> need
> >> > to define the RF230_DEF_RFPOWER preprocessor variable (e.g. by adding
> >> > -DRF230_DEF_RFPOWER=9). This defines the TX_PWR field of the
> >> PHY_TX_PWR
> >> > register.  Please see pp 59-60 of the rf230 data sheet for the
> >> supported
> >> > power values (0:most power, 0xf: least power,
> >> >
> >> > http://www.atmel.com/dyn/resources/prod_documents/doc5131.pdf
> >> > )
> >> >
> >> >
> >> >
> >> > Alternatively, you can set the transmit power on a per packet basis
> >> through
> >> > the PacketTransmitPower interface of DefaultPacketC.  That is, you
> >> need to
> >> > set the transmit power every time before calling AMSend.send.
> >> >
> >> >
> >> >
> >> > You need to add this wiring to your configuration (assuming the module
> >> where
> >> > you set the transmit power is called MyAppC.nc):
> >> >
> >> >
> >> >
> >> > components DefaultPacketC;
> >> >
> >> > DefaultPacketC.PacketTransmitPower ->
> >> > MyAppC.PacketTransmitPower;
> >> >
> >> >
> >> >
> >> > Then, your module:
> >> >
> >> >
> >> >
> >> > uses interface PacketField<uint8_t> as PacketTransmitPower;
> >> >
> >> > //...
> >> >
> >> > implementation {
> >> >
> >> > //...
> >> >
> >> > call PacketTransmitPower.set(&my_message_t, /* some small
> >> > value here, see the rf230 datasheet*/);
> >> >
> >> > call AMSend.send(addr, &my_message_t, len);
> >> >
> >> >
> >> >
> >> > Janos
> >> >
> >> >
> >> >
> >> >
> >> > From: tinyos-help-bounces at millennium.berkeley.edu
> >> > [mailto:tinyos-help-bounces at millennium.berkeley.edu] On
> >> > Behalf Of Xiaojun Zhu
> >> > Sent: Friday, May 09, 2008 11:46 PM
> >> > To: tinyos-help at millennium.berkeley.edu
> >> > Subject: [Tinyos-help] How to control the radio power in iris
> >> platform?
> >> >
> >> >
> >> >
> >> >
> >> > Hi all,
> >> >
> >> >
> >> >          I want to make the mote not so powerful so that the message
> >> can
> >> > reach the destination only by multi-hop in a limited area,like in  a
> >> room.
> >> > The reason is that I want to study the behavior of MULTI-HOP in my
> >> lab. I
> >> > search this list and find some one posted a question similar to this
> >> > without replying. Is that possible? I'm using Iris platform.
> >> >
> >> >
> >> >          Please let me know if my expression is not so clearly.
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >             Thanks,
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >            Regards,
> >> >
> >> >
> >> >            Xiaojun
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > ________________________________
> >> >
> >> >
> >> > Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try
> >> it
> >> > now.
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> >> >
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> >> >
> >>
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