On 15/11/2010, at 4:26 AM, wafa jaballah <[email protected]> wrote:
> Hello,
>
> I want to calculate the local and global time in the receiver's side in order
> to do use them in further calculations so I have used the following code:
>
> event message_t* RadioReceive.receive(message_t* data, void* payload,
> uint8_t len ) {
>
> uint8_t is_synced;
> call Leds.led0Toggle();
>
> if ( call PacketTimeStamp.isValid(data)) {
>
> uint32_t rxTimestamp = call PacketTimeStamp.timestamp(data);
>
> printf ("local rx_timestamp is %ld \n",rxTimestamp );
>
> is_synced = call GlobalTime.local2Global(&rxTimestamp);
>
> printf ("global rx_timestamp is %ld and skew is %ld and %ld :\n",
> rxTimestamp,(uint32_t)call TimeSyncInfo.getSkew()*1000000UL,
>
> call TimeSyncInfo.getSeqNum());
>
> printf ("report is synchronised is %ld \n", is_synced);
> }
> //some codes
> ......
> .....
>
> }
>
> I have also do the appropritate wiring of my components in my configuration
> file.
>
> When running these in my telosb motes , I found that I have the value of
> LocalTime and Global Time are the same. Here is some output related to this
Global and local times will be the sMe at the root node. Try
programming multiple nodes.
> Thread[Thread-1,5,main] local rx_timestamp is c29457
> global rx_timestamp is 29457 and skew is 0 and 1930493952 :
> report is synchronised is -1633550335
> received data packet 1
> local rx_timestamp is 39635
> global rx_timestamp is 39635 and skew is 0 and -1697447936 :
> report is synchronised is -1633550335
> received data packet 2
> ......
> ......
> I don't know how could I correct this since I have used the global time
> interface and PacketTimeStamp which are recommended.
>
> Any help will be very appreciated
> Thanks in Advance,
> --
>
> Best Regards,
> Wafa Ben Jaballah
>
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