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

[Dan]

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
> >
> >
> >
> >
> >
> >
> >
> >
> > ________________________________
> >
> >
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> it
> > now.
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