I guess since she/he is disabling the ack, Liu does not expect the timer to
be resetted at every send done.
Alban
2007/11/26, Kevin Klues <[EMAIL PROTECTED]>:
>
> Daniel is right. Everytime you receive a sendDone, you are resetting
> Timer1, so it basically never has the chance to fire before you reset
> it again. What you probably want to do instead of keeping a second
> timer is change the frequency whenever you have received the 1200th
> sendDone event. This is the same as having two timers, one that runs
> with frequency 0.25s and one with 5s.
>
> Kevin
>
> On Nov 25, 2007 6:19 PM, daniel widyanto <[EMAIL PROTECTED]>
> wrote:
> > Hi,
> >
> > Just suggestion, I think when you call Timer1.start( TIMER_REPEAT,
> > period_Timer1 ) before Timer1.fired() called, the Timer1 counter value
> > will be reset back to period_Timer1 (I'm not very sure about this, take
> > a look at the TimerM implementation in your TinyOS source code).
> >
> > Anyway, just to remind you, none of us is being payed as customer
> > service here. So, if your questions are not answered, be patient or try
> > to debug it yourself (and tell the group how you solve it, if you like).
> >
> > Regards,
> >
> > -daniel
> >
> >
> >
> > On Sun, 2007-11-25 at 23:42 +0000, Ruoshui Liu wrote:
> > > Hi Cory and Michael,
> > >
> > > I have been stuck with the Timer problem for a long time, I hope I
> could
> > > get any suggestions from you. Currently, I implemented an application
> > > which sets up a single radio link between one transmitter and one
> > > receiver. I want to implement the frequency change at both the
> > > transmitter and the receiver ends. The transmitter is switched on
> first,
> > > and keeps transmitting the messages (the message content is the
> counter
> > > value) on one particular frequency (Let's say on channel 11). It won't
> > > change its frequency until the receiver is switched on as well and
> send
> > > back an acknowledgement to the transmitter. At the time when the
> > > transmitter receives the ack from the receiver, both ends change the
> > > transmission frequency at the same rate and keep synchronisation all
> the
> > > time.
> > >
> > > I used Timer0 to control the rate (fire every 0.25s) to fire the timer
> > > and send the counter value, and used Timer1 to control the rate (5s)
> of
> > > frequency change (from channel 11 to channel 26). I can get the
> > > acknowledgement back from the receiver when it is switched on, but I
> > > can't get the transmissin frequency changed even I did call
> > > Timer1.start( ) within the Send.sendDone( ). I suspected that it
> nevet
> > > gets a chance to set a new transmission frequency before sending out
> the
> > > messages due to the not precise timing, since the Timer0 and Timer1
> are
> > > the instances of Timer. However, I am not sure if I am right to this,
> > > and I can't find a solution to the problem. My code is pasted here for
> > > you to look at.
> > >
> > > command result_t StdControl.init()
> > > {
> > > m_int = 0;
> > > freq_int = 0;
> > > period_Timer0 = 256;
> > > period_Timer1 = 5120;
> > > m_sending = FALSE;
> > > call Leds.init();
> > > return SUCCESS;
> > > }
> > >
> > > command result_t StdControl.start()
> > > {
> > > call MacControl.enableAck();
> > > if( TOS_LOCAL_ADDRESS == 1 ){
> > > call Timer0.start( TIMER_REPEAT, period_Timer0 );
> > > }
> > > return SUCCESS;
> > > }
> > >
> > > command result_t StdControl.stop()
> > > {
> > > return SUCCESS;
> > > }
> > >
> > > /**
> > > * Tim0 is only called in the transmitter.
> > > */
> > > event result_t Timer0.fired()
> > > {
> > > if( m_sending == FALSE )
> > > {
> > > CountMsg_t* body = (CountMsg_t*)m_msg.data;
> > > body->n = m_int;
> > > body->src = TOS_LOCAL_ADDRESS;
> > > if( call SendMsg.send( 0, sizeof(CountMsg_t), &m_msg ) ==
> SUCCESS )
> > > {
> > > call Leds.set(m_int);
> > > m_sending = TRUE;
> > > }
> > > }
> > > m_int++;
> > > return SUCCESS;
> > > }
> > >
> > > event result_t Timer1.fired()
> > > {
> > > if (freq_int <= 15)
> > > {
> > > call CC2420Control.TunePreset(freq_channel[freq_int]);
> > > freq_int++;
> > > }
> > > else
> > > {
> > > freq_int = 0;
> > > call CC2420Control.TunePreset(freq_channel[freq_int]);
> > > }
> > > return SUCCESS;
> > > }
> > >
> > > event result_t SendMsg.sendDone(TOS_MsgPtr msg, result_t success)
> > > {
> > > if (!(msg->ack)){
> > > m_int--;
> > > call Leds.yellowToggle();
> > > }
> > > else {
> > > call MacControl.disableAck();
> > > call Timer1.start( TIMER_REPEAT, period_Timer1 );
> > > }
> > >
> > > m_sending = FALSE;
> > > return SUCCESS;
> > > }
> > >
> > > event TOS_MsgPtr ReceiveMsg.receive(TOS_MsgPtr msg)
> > > {
> > > CountMsg_t* body = (CountMsg_t*)(&msg->data[0]);
> > > call Leds.set(body->n);
> > > return msg;
> > > }
> > > }
> > >
> > > Could you help me with this please? Thank you very much!
> > >
> > > Best regards,
> > > Ruoshui Liu
> >
> >
> >
> > _______________________________________________
> > Tinyos-help mailing list
> > [email protected]
> > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
> >
>
>
>
> --
> ~Kevin
> _______________________________________________
> Tinyos-help mailing list
> [email protected]
> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>
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