[Tinyos-help] Problem with startPeriodicAt() timer

[Linas Ramanauskas]

Hello,

Here is a demo application where each two seconds timer should fire
and print time returned by getNow(). To start the timer,
startPeriodicAt(delay, interval) is called at
RadioControl.startDone(). If delay is 100ms timer works correctly and
fires each 2 seconds. If delay is 200ms timer starts to fire without
any responsibility and fires in a rate of couple ms.


Correct result (displayed time is in ms):

Boot.booted() delay = 100, interval = 2048
RadioControl.startDone() SUCCESS
2148
4196
6244
8292
...

Incorrect result (displayed time is in ms):

Boot.booted() delay = 200, interval = 2048
RadioControl.startDone() SUCCESS
143
149
150
152
158
160
...


If call RoutingControl.start(); is commented in both cases timer works
correctly. Please, can anyone tell me what is wrong? Is it a bug?
Source code is below and also attached to this e-mail. Tested with
TinyOS 2.1.0 released at 2009/02/05 with a TelosB platform.


*** File: Makefile ***

COMPONENT=TestPrintfAppC
CFLAGS += -I$(TOSDIR)/lib/printf

CFLAGS += -I$(TOSDIR)/lib/net \
          -I$(TOSDIR)/lib/net/le \
          -I$(TOSDIR)/lib/net/ctp

include $(MAKERULES)



*** File: TestPrintfAppC.nc ***

#include "printf.h"

configuration TestPrintfAppC{
}
implementation {
  components MainC, TestPrintfC;
  components new TimerMilliC() as TestTimer;

  TestPrintfC.Boot -> MainC;
  TestPrintfC.TestTimer -> TestTimer;

  components ActiveMessageC;
  TestPrintfC.RadioControl -> ActiveMessageC;

  components CollectionC as Collector;
  TestPrintfC.RoutingControl -> Collector;

  components new CollectionSenderC(1) as CollectionSender;
  TestPrintfC.CollectionSend -> CollectionSender;
}



*** File: TestPrintfC.nc ***

#include "printf.h"

module TestPrintfC (){
  uses {
    interface Boot;
    interface Timer<TMilli> as TestTimer;

    interface SplitControl as RadioControl;
    interface StdControl as RoutingControl;
    interface Send as CollectionSend;
  }
}
implementation {
   uint32_t delay;
   uint32_t interval;

  event void Boot.booted() {
    delay = 200;
    interval = 2048;
    call RadioControl.start();
    printf("\nBoot.booted() delay = %lu, interval = %lu\n", delay, interval);
    printfflush();
  }

  event void RadioControl.startDone(error_t err) {
    printf("RadioControl.startDone() ");

    if (err == SUCCESS) {
      call RoutingControl.start();      // if this is commented timers
works correctly
      printf("SUCCESS\n");
    }
    else {
      call RadioControl.start();
      printf("FAIL\n");
    }

    printfflush();
    call TestTimer.startPeriodicAt(delay, interval);
  }

  event void TestTimer.fired() {
    printf("%lu\n", call TestTimer.getNow());
    printfflush();
  }

  event void RadioControl.stopDone(error_t err) {}

  event void CollectionSend.sendDone(message_t *m, error_t err) {
    printf("CollectionSend.sendDone()\n");
    printfflush();
  }
}


Best regards,
Linas Ramanauskas

Makefile
Description: Binary data

TestPrintfAppC.nc
Description: Cdf file

TestPrintfC.nc
Description: Cdf file

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