[Tinyos-help] startOneShot
Ittipong Khemapech
ik.tinyos at googlemail.com
Tue May 5 23:22:52 PDT 2009
Start of Frame Delimiter. It's a part of MAC header.
Correct me if I'm wrong.
Ittipong
2009/5/6 Michael Schippling <schip at santafe.edu>
> ummm....what's an SFD?
> MS
>
>
> Philip Levis wrote:
>
>> 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 <ik.tinyos at googlemail.com>
>>> 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 <schip at santafe.edu>
>>>
>>> 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) {
>>> }
>>>
>>> }
>>> ====================================================================
>>>
>>>
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
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>>
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