[Tinyos-help] GenericComm SimpleCmd UART.

[Phani Kumar Arava]

Maybe, I was unclear in my previuos mail. I was trying to send messages from
the PC to the mote, trying to send commands to the mote, for example LEDS_ON
.Similar to SimpleCmd, but just using UART.

I was trying to do this, but was not successful, so started debuggin and
found the same results, the issue here was in AMStandard.nc where
UARTRecv.receive was saying

event TOS_MsgPtr UARTReceive.receive(TOS_MsgPtr packet) {
    // A serial cable is not a shared medium and does not need group-id
    // filtering
    packet->group = TOS_AM_GROUP;
    return received(packet);
  }


and the received function here says.


TOS_MsgPtr received(TOS_MsgPtr packet)  __attribute__ ((C, spontaneous)) {
    uint16_t addr = TOS_LOCAL_ADDRESS;
    counter++;
    dbg(DBG_AM, "AM_address = %hx, %hhx; counter:%i \n ", packet->addr,
packet->type, (int)counter);

    if (packet->crc == 1 && // Uncomment this line to check crcs
        packet->group == TOS_AM_GROUP &&
        (packet->addr == TOS_BCAST_ADDR ||
         packet->addr == addr))
      {

        uint8_t type = packet->type;
        TOS_MsgPtr tmp;
        // Debugging output
        dbg(DBG_AM, "Received message:\n\t");
        dbgPacket(packet);
        dbg(DBG_AM, "AM_type = %d\n", type);

        // dispatch message
        tmp = signal ReceiveMsg.receive[type](packet);
        if (tmp)
          packet = tmp;
      }
    return packet;
  }


The problem here Iam pointing to is with the UART.Lets say Iam sending
something into the mote using SerialForwarder,  with TOS_UART_ADDR , will
that raise the signal ReceiveMsg.receive ?

I think it will not.

So to get my stuff running, I modified the code of receive to be like

 event TOS_MsgPtr UARTReceive.receive(TOS_MsgPtr packet) {
    uint16_t addr = TOS_LOCAL_ADDRESS;
    // A serial cable is not a shared medium and does not need group-id
    // filtering
    packet->group = TOS_AM_GROUP;
    packet->addr =TOS_LOCAL_ADDRESS;
    return received(packet);
  }

Now Iam able to receive the commands from the C, But iam not sure whether is
the right way the TINYOS people meant it to be like.


On 11/28/06, Michael Schippling <schip at santafe.edu> wrote:
>
> This is all T1 stuff...
>
> I'm not entirely clear on what you are doing or asking since the
> question is about send and you have some snippets of receive code...
>
> In general you can send to the serial port using TOS_UART_ADDR ala:
>      call RStatusMsg.send( TOS_UART_ADDR, sizeof(RoboStatusMsg), statmsgp
> );
>
> If you have another mote on the other end of the serial line, then you
> should be able to get GenericComm messages from radio or uart using the
> standard message configuration techniques to wire to your method, like:
>      event TOS_MsgPtr RCmdStartMsg.receive(TOS_MsgPtr m) {  }
>
> There are some convoluted comm examples in my code at:
>      http://www.etantdonnes.com/Motes/robocode.tar.gz
>
> MS
>
> Phani Kumar Arava wrote:
> > I was trying to write a Command Interface to my mote. Iam not sure
> > whether this is a bug, (Or maybe iam using the wrong component for UART
> > communication)
> >
> > But when I send some message to my mote using GenericComm (or anything
> > using AMStandard)
> >
> > event TOS_MsgPtr UARTReceive.receive(TOS_MsgPtr packet) {
> >     // A serial cable is not a shared medium and does not need group-id
> >     // filtering
> >     packet->group = TOS_AM_GROUP;
> >     return received(packet);
> >   }
> >
> >
> > In AMStandard received.
> >
> >     if (packet->crc == 1 && // Uncomment this line to check crcs
> >         packet->group == TOS_AM_GROUP &&
> >         (packet->addr == TOS_BCAST_ADDR ||
> >          packet->addr == addr) )
> >
> > Isnt this a problem with TOS_UART_ADDR . I mean the message that is
> > communicated through UART, does not indicate a signal to the event
> > received. that means if Iam sending anything through UART with my
> > messages, it doesnt signal anything?
> >
> > Is that the architecture of TinyOS always meant that the packet sent
> > through UART always meant to be TOS_LOCAL_ADDR ?
> >
> >
> >
> >
> >
> > --
> > Phani Kumar Arava
> > Grad Student                                             1560
> > Worthington Street
> > Department Of Computer Science                Columbus Ohio 43201
> > 2015 Neil Avenue
> > Ohio State University
> > Columbus Ohio-43210
> >
> > Contact: (614)-286-2618
> > URL : www.cse.ohio-state.edu/~arava/ <
> http://www.cse.ohio-state.edu/~arava/>
> > mailto: arava.3 at osu.edu <mailto:arava.3 at osu.edu>,phani.arava at gmail.com
> > <mailto:phani.arava at gmail.com>, arava_phani at yahoo.com
> > <mailto:arava_phani at yahoo.com>
> >
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > Tinyos-help mailing list
> > Tinyos-help at Millennium.Berkeley.EDU
> >
> https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>
>


-- 
Phani Kumar Arava
Grad Student                                             1560 Worthington
Street
Department Of Computer Science                Columbus Ohio 43201
2015 Neil Avenue
Ohio State University
Columbus Ohio-43210

Contact: (614)-286-2618
URL : www.cse.ohio-state.edu/~arava/
mailto: arava.3 at osu.edu,phani.arava at gmail.com, arava_phani at yahoo.com
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