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 <[EMAIL PROTECTED] > 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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