[Tinyos-help] error while incorporating interface CC2420Packet;

[Vijayant Bhatnagar]

Hi,
I think I made a mistake by creating a new function. I should have modified
existing send function of TossimpacketC. Then i would just call AMsend.sendetc..

Please correct me if I am wrong.
Any help is greatly appreciated.

Thanks,
Vijayant

On Dec 4, 2007 1:01 AM, Vijayant Bhatnagar <vijayant.rutgers at gmail.com>
wrote:

> Hi,
> Since we have started working on TinyOS a week back, I may be wrong. The
> following is the change I made:
> Please correct me if I am wrong :
>
>
> TossimRadioMsg.h
> typedef nx_struct tossim_metadata {
>
>   //Added by vijayant
>   nx_uint8_t tx_power;
>   nx_uint16_t strength;
>   nx_uint8_t ack;
>   nx_uint16_t time;
> } tossim_metadata_t;
>
> TossimPacketModel.nc
>   //Added by Vijayant
>   command error_t send_setPower(int node, message_t* msg, uint8_t len);
>
>
> TossimPacketModelC.nc
> //Added by Vijayant
>   command error_t Packet.send_setPower(int dest, message_t* msg, uint8_t
> len)
>   {
>
>      tossim_metadata_t* meta;
>     if (!initialized) {
>       dbgerror("TossimPacketModelC", "TossimPacketModelC:
> Send.send_setPower() called, but not initialized!\n");
>       return EOFF;
>     }
>     if (!running) {
>       dbgerror("TossimPacketModelC", "TossimPacketModelC:
> Send.send_setPower() called, but not running!\n");
>       return EOFF;
>
>     }
>     if (sending != NULL) {
>       return EBUSY;
>     }
>
>
>     if ( power > 31 ){
>       power = 31;
>       }
>
>       meta = getMetadata(msg);
>       power= meta->tx_power;
>
>     sendingLength = len;
>     sending = msg;
>     destNode = dest;
>     backoffCount = 0;
>     neededFreeSamples = sim_csma_min_free_samples();
>     start_csma();
>     return SUCCESS;
>   }
>
>
>
> module TossimPacketModelC {
>   provides {
>     interface Init;
>     interface SplitControl as Control;
>     interface PacketAcknowledgements;
>     interface TossimPacketModel as Packet;
>   }
>   uses interface GainRadioModel;
> }
> implementation {
>      uint8_t power; //Added global varibale by vijayant
>
>
> .....
>
> and the last change i did is :In  void send_transmit(sim_event_t* evt)
>
>     call GainRadioModel.putOnAirTo(destNode, sending, metadata->ack,
> evt->time, power, power);      //Modified by Vijayant
> //    call GainRadioModel.putOnAirTo(destNode, sending, metadata->ack,
> evt->time, 0.0, 0.0); //Initially
>
>
> This thing compiles well.
>
> Can anyone now please give me some idea on where to wire this
> Send_radiomodel function. I tried wiring directly TossimPacketModelC but it
> is not working.
>
> Any help is appreciated.
>
> Thanks,
> Vijayant
>
>
>
>
>
>
>
>
>
>
> On Dec 3, 2007 12:42 PM, Philip Levis <pal at cs.stanford.edu > wrote:
>
> >
> > On Dec 2, 2007, at 3:47 PM, Vijayant Bhatnagar wrote:
> >
> > > Hi Kevin,
> > > I would like to thank you for your reply. We are indeed using
> > > TOSSIM. Right now I am trying to get the latest source code from
> > > CVS and then try to run my code.
> > >
> > > Do you think that we will not be able to change TX_POWER even after
> > > getting the latest source code ? Any help by others is
> > > appreciated ! Actually, changing TX_POWER is very important for our
> > > research. If this thing doesn't work, it will be very difficult for
> > > us to prove our algorithm. So, we have to get this working at any
> > > cost!
> > >
> > > Any help appreciated in this regards.
> > >
> >
> > TOSSIM currently doesn't supporting changing TX power, but its
> > implementation is such that adding such support would not be too
> > hard. The call you care about is in TossimPacketModelC.nc:
> >
> >     call GainRadioModel.putOnAirTo(destNode, sending, metadata->ack,
> > evt->time,
> > 0.0, 0.0);
> >
> > The signature is this:
> >
> >   command void putOnAirTo(int dest,
> >                           message_t* msg,
> >                           bool ack,
> >                           sim_time_t endTime,
> >                           double gain,
> >                           double reverseGain);
> >
> > Basically, the final two parameters, both of which are 0.0, are there
> > to incorporate TX power control. It assumes 0.0 is the max power. If
> > you want the node to transmit at a lower power, then you change the
> > first parameter. The second parameter is the receiver's transmit
> > power, which matters for acknowledgement transmissions.
> >
> > So if you put a metadatafield in the message_t that held the transmit
> > power level and could be set by an interface, then pulled that out
> > just before this call in order to change the gain, that would work.
> > I'd add some noise or non-linearity in there because TX power control
> > is rarely a simple and crisp curve. But you can refer to chip data
> > sheets to see what their curves look like.
> >
> > Phil
> >
>
>
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