[Tinyos-help] odd problem on message_t

[BAI LI]

Hi All,

I am currenting doing a very simple network test. I designed the message
structure in ****.h file and some sending functions in the following.

typedef nx_struct HashMsg {
  nx_uint16_t nodeid;
  nx_uint8_t flag;
  nx_uint32_t payload_MD1;
  nx_uint32_t payload_MD2;
  nx_uint64_t payload_M;
  nx_uint64_t payload_R;
  nx_uint16_t payload_ID;
} HashMsg;


Part of the sending code is as folows:


event void Timer0.fired() {

 uint16_t destinationMote=0x0002;
    if (!busy) {
      HashMsg* hmpkt =
 (HashMsg*)(call Packet.getPayload(&pkt, sizeof(HashMsg)));
      if (hmpkt == NULL) {
 return;
      }
      hmpkt->flag=1;
      hmpkt->nodeid = TOS_NODE_ID;
      hmpkt->payload_MD1 = 0x12345678;
   hmpkt->payload_MD2 = 0x90ABCDEF;    // disable this line, it will work
   hmpkt->payload_M=0x0000000000000000;
   hmpkt->payload_R=0x0000000000000000;
   hmpkt->payload_ID=0x0000000000000000;
      if (call AMSend.send(destinationMote,
          &pkt, sizeof(HashMsg)) == SUCCESS) {
  call Leds.led0On();
        busy = TRUE;
      }
    }

  }

When the program loads the data to send. The program is dead with one more
line "hmpkt->payload_MD2 = 0x90ABCDEF";. I don't know what the problem is as
I have changed the #define TOSH_DATA_LENGTH to 35 in message.h which is
enough to handle the data. However it didn't work still. I suspect that it
could be message size problem. But I can't work it out. THanks.

Regards,
Bai
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