Hello,
msg=(message_t *)btrpkt; is not correct, you are assigning the payload
to the msg, you can't do that. msg is a pointer to the AMPacket, btrpkt
is a pointer to the payload within the AMPacket. So your packet is
alredy set up without the mentioned line of code. You can just send msg
and your edited payload is already assigned to the msg.
But there is another problem. if you resend the msg, you can't return
the same one at the end of the Funktion. In that case the Networkstack
may reuses the memory for a new incoming packet bevore your packet is
send. you have to define a global msg and return thatone. do something
like (pseudocode):
bool busy = FALSE;
message_t firstUnusedMsg;
message_t* pointerToSomeNotUsedMsg = &firstUnusedMsg;
event message_t* Receive.receive(message_t* msg, void* payload, uint8_t
len){
BlinkToRadioMsg* btrpkt;
if (len != sizeof(BlinkToRadioMsg))
return msg;
btrpkt = (BlinkToRadioMsg*)payload;
//do what you want with your payload, e.g.:
btrpkt->LedDaAccendere++;
if(busy)
return msg; //you can't handle it, you need a free msg
else
busy = TRUE;
if(call AMSend.send(AM_BROADCAST_ADDR,msg,sizeof(BlinkToRadioMsg)) !=
SUCCESS)
busy = FALSE;
message_t* ret = pointerToSomeNotUsedMsg;
pointerToSomeNotUsedMsg = msg;
return ret;
}
event sendDone(...)
{
if(msg == pointerToSomeNotUsedMsg)
busy = FALSE;
}
Keep in mind: busy is not a lock for the Networkstack, it is a lock for
your datastructures, in this example pointerToSomeNotUsedMsg
I strongly recommand the communication tutorial!
I hope i could help,
Jack Porter
Nino Caruso schrieb:
> Hi to all,
> i've a problem with telosb / tinyos-2.x, it is the sequent:
>
> event message_t* Receive.receive(message_t* msg, void* payload, uint8_t
> len){
> BlinkToRadioMsg* btrpkt;
> if (len == sizeof(BlinkToRadioMsg)) {
> btrpkt = (BlinkToRadioMsg*)payload;
> if(btrpkt->destid==TOS_NODE_ID) {
> setLeds(btrpkt->LedDaAccendere);
> btrpkt->LedDaAccendere++;
> if(btrpkt->LedDaAccendere==3) btrpkt->LedDaAccendere=0;
> btrpkt->destid=1;
> btrpkt->sourceid=TOS_NODE_ID;
> }
> }
> if(!busy){
> msg=(message_t *)btrpkt;
> if(call AMSend.send(AM_BROADCAST_ADDR,msg,sizeof(BlinkToRadioMsg)) ==
> SUCCESS) busy=TRUE;
> }
> return msg;
> }
> }
>
> my problem is that the mote don't send any packet , maybe there is
> something in the build of the msg before call AMSend, i don't know how
> to put the structure in a variable message_t like msg.
>
>
> specify that : BlinkToRadioMsg is a structure :
> typedef nx_struct BlinkToRadioMsg {
> nx_uint8_t sourceid;
> nx_uint8_t destid;
> nx_uint8_t LedDaAccendere;
> } BlinkToRadioMsg;
>
> thank you so much
>
>
> --
> Nino Caruso <[email protected]
> <mailto:[email protected]>>
>
>
> ------------------------------------------------------------------------
>
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> Tinyos-help mailing list
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