[Tinyos-help] A possible bug in BaseStation application, TinyOS 2.1.0

[Dongzhen Piao]

I'm using CC1000 radio module. Here's what I found in CC1000SendReceiveP.nc
file:

Starting from line 629 >>

  /* Abstract packet layout */

  command void Packet.clear(message_t *msg) {
    memset(msg, 0, sizeof(message_t));
  }

<<

So I guess this 'memset' function is clearing everything.

On Thu, Jun 18, 2009 at 10:47 AM, Janos Sallai
<sallai at isis.vanderbilt.edu>wrote:

> Packet.clear() does not clear the packet payload, only the control
> fields. Your problem was probably something else.
>
> What platform do you use?
>
> Janos
>
> On Thu, Jun 18, 2009 at 12:58 AM, Dongzhen Piao<parkurm at gmail.com> wrote:
> > Hi all,
> >
> > I was writing a simple program to send commands from a base station to
> > sensor motes. I defined several fields in the command packet, and set
> them
> > to predefined command value before sending the packet.
> >
> > But when the sensor motes received the command message, all the fields
> are
> > 0. After a long period of debugging, I finally found that the problem
> > happens in the standard BaseStation application shipped with TinyOS
> 2.1.0.
> >
> > Here's the function in BaseStationP.nc file, where the problem occurs:
> >
> >   task void radioSendTask() {
> >     uint8_t len;
> >     am_id_t id;
> >     am_addr_t addr,source;
> >     message_t* msg;
> >
> >     atomic
> >       if (radioIn == radioOut && !radioFull)
> >     {
> >       radioBusy = FALSE;
> >       return;
> >     }
> >
> >     msg = radioQueue[radioOut];
> >     len = call UartPacket.payloadLength(msg);
> >     addr = call UartAMPacket.destination(msg);
> >     source = call UartAMPacket.source(msg);
> >     id = call UartAMPacket.type(msg);
> >
> >     call RadioPacket.clear(msg);
> >     call RadioAMPacket.setSource(msg, source);
> >
> >     if (call RadioSend.send[id](addr, msg, len) == SUCCESS)
> >       call Leds.led0Toggle();
> >     else
> >       {
> >     failBlink();
> >     post radioSendTask();
> >       }
> >   }
> >
> > In the line bolded, the function clears all fields in the packet received
> > from UART, and forwards it to the radio. The behaviour is strangely set
> to
> > clear the packet, which is not desirable in such a "bridging"
> application.
> >
> > After commenting out the line, my program worked just fine.
> >
> > Does anybody have some idea about this? Is this a bug, or is this some
> > behaviour desired by the application author?
> >
> > Thanks.
> >
> > Dongzhen Piao
> >
> >
> > _______________________________________________
> > 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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