If there's an SFD before the timer fires, your code will reset the timer to fire. E.g., imagine your mote has an SFD interrupt every 500ms. It will set the timer to fire in 1024ms, the SFD goes again, it will reset the timer to fire in 1024ms, the SFD goes again...
I don't know if that's the root of your problem, but it's definitely an issue. Phil On Apr 23, 2009, at 2:42 AM, Ittipong Khemapech wrote: > I start the timer within the receive() event and *nothing* happens. > No packet is transmitted by the source. I'm pretty sure that the > radio is on at that time. > > I posted this problem several weeks ago and still got no reply. > That's why I have to use the InitW2RTimer and it's started in the > receivedSFD() event. > > Anybody got the same experience? > > Thanks, > Ittipong > > > 2009/4/21 Ittipong Khemapech <[email protected]> > It wasn't me asking about the previous Timer questions. Many thanks > for your hints. Will try and get back soon. > > Ittipong > > 2009/4/21 Michael Schippling <[email protected]> > > I guess this is what you were trying to get at in previous > Timer questions, right? > > It looks like it should work the way you want. The only thing > I can see that is questionable is the long atomic {block} for > your message sending in DataSendTimer.fired(). This might > block interrupts for too long. > > I would try to simplify the Timer scheme on it's own, flashing > LEDs or something to see if it works the way you expect, and then > start adding the radio message drivers back in. > > I think you should also be able to use the receive() method instead > of starting your first timer, because it is called after the message > is fully received. > > MS > > Ittipong Khemapech wrote: > Hi, > > I have been trying to figure the problems out for days. No idea what > causes it. > > I have a source receiving a packet from the base station. After the > SFD is received, a timer is called to run to make sure that the > reception is completed. The source waits for a wait_interval > duration to send its data packet. So, another timer is used for > timing the transmission. > > I am using AlarmToTimer component. The command startOneShot is > called. What I expect is that the source should send *only after* it > receives the packet from base station. It seems to me that the > source keeps sending. > > Look forward to hear from you soon. > > Thanks, > Ittipong > > The codes are as follows: > > MyDef.h > --------------------------------------------------------------------------------------------------- > > #ifndef MYDEF_H_ > #define MYDEF_H_ > > enum { > WAIT_TO_RECEIVE = 1024 > }; > > #endif > ================================================== > > SourceAppC.nc > ---------------------------------------------------------------------------------------------------- > > #include "MyDef.h" #include "DataMsg.h" > #include "ControlMsg.h" > > configuration SourceAppC { > } > implementation { > components MainC; > components ActiveMessageC; > > components new AMSenderC(AM_DATAMSG) as AMSenderDataC; > components new AMReceiverC(AM_CONTROLMSG) as AMReceiverCtrlC; > > components new Alarm32khz32C() as Alarm2Timer; > components new AlarmToTimerC(T32khz) as W2RTimer; > components new AlarmToTimerC(T32khz) as SendTimer; > > components CC2420TransmitC; > components CC2420ActiveMessageC; > > components SourceC as App; > > // Wiring > App.Boot -> MainC; > > App.Packet -> AMSenderDataC; > App.AMPacket -> AMSenderDataC; > App.AMSend -> AMSenderDataC; > App.Receive -> AMReceiverCtrlC; > > App.AMControl -> ActiveMessageC;; > > App.InitW2RTimer -> W2RTimer; App.DataSendTimer -> SendTimer; > W2RTimer.Alarm -> Alarm2Timer; > SendTimer.Alarm -> Alarm2Timer; > App.CC2420Packet -> CC2420ActiveMessageC; > App.RadioTimeStamping -> CC2420TransmitC; > App.CC2420Transmit -> > CC2420TransmitC; } > ===================================================== > > SourceC.nc > ---------------------------------------------------------------------------------------------------------- > > #include <Timer.h> > #include "MyDef.h" #include "DataMsg.h" > #include "ControlMsg.h" > > module SourceC { > uses { > interface Boot; > interface AMSend; > interface Receive; interface AMPacket; > interface Packet; > interface Timer<T32khz> as InitW2RTimer; > interface Timer<T32khz> as DataSendTimer; > interface RadioTimeStamping; interface SplitControl > as AMControl; > interface CC2420Packet; interface > CC2420Transmit; > } > } > implementation { > message_t dpkt, cpkt; > bool sending = FALSE; > uint16_t pktseq, sentpkts; uint8_t > current_tx > ; > uint8_t base_addr, me; > uint32_t no_slot, slot_length, slot_start; uint32_t > wait_interval; > > uint16_t rcv_no; > > task void callInitW2RTimer() { > call InitW2RTimer.startOneShot(WAIT_TO_RECEIVE); > } > > task void callDataSendTimer() { > call DataSendTimer.startOneShot(wait_interval); > } > > event void Boot.booted() { > call AMControl.start(); > } > > event void AMControl.startDone(error_t err) { > if (err != SUCCESS) { > call AMControl.start(); > } > } > > event void AMControl.stopDone(error_t err) { > } > > event void InitW2RTimer.fired() { > post callDataSendTimer(); > } > event void DataSendTimer.fired() { > > if (!sending) { > atomic { > > DataMsg* dataMsg = (DataMsg*)(call > Packet.getPayload(&dpkt, NULL)); > > sentpkts++; > pktseq++; > > call CC2420Packet.setPower(&dpkt, > MAX_TX); current_tx = call > CC2420Packet.getPower(&dpkt); > dataMsg->pkt_type = 1; > dataMsg->source_id = me; > dataMsg->rcv_no = rcv_no; > > dataMsg->tx_power = current_tx; > dataMsg->snt_no = sentpkts; > dataMsg->seq_no = pktseq; > dataMsg->slot = no_slot; > dataMsg->length = slot_length; > dataMsg->start = slot_start; > dataMsg->wait = wait_interval; > > if (call AMSend.send(base_addr, &dpkt, sizeof(DataMsg)) > == SUCCESS) { > sending = TRUE; } > } > } > > } > event void AMSend.sendDone(message_t *msg, error_t error) { > if (&dpkt == msg) { > atomic { > sending = FALSE; > } } > } > event message_t* Receive.receive(message_t* msg, void* payload, > uint8_t len) { > > if (len == sizeof(ControlMsg)) { > atomic { > ControlMsg* controlMsg = (ControlMsg*) payload; > > base_addr = controlMsg->base_id; > me = TOS_NODE_ID; > > rcv_no = controlMsg->snt_no; > > no_slot = controlMsg->no_alloc_slot; > slot_length = controlMsg->slot_length; > slot_start = controlMsg->slot_start; > > wait_interval = (uint32_t) (((me - 1) * slot_length) + > slot_start); > > } > } > return msg; > } > > > async event void RadioTimeStamping.transmittedSFD(uint16_t time, > message_t* p_msg) { > } > > async event void RadioTimeStamping.receivedSFD(uint16_t time) { > post callInitW2RTimer(); } > > async event void CC2420Transmit.sendDone(message_t* p_msg, error_t > error) { > } > > } > ==================================================================== > > > > > ------------------------------------------------------------------------ > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
