Hi,
I've some problems using RadioTimeStamping.transmittedSFD() to timestamp
when the SFD is captured.
My message structure declaration is as follows:
typedef nx_struct MyMsg {
nx_uint8_t base_id;
nx_uint8_t src_id;
nx_uint16_t cycle_no;
nx_uint32_t b_send;
nx_uint32_t s_recv;
nx_uint32_t s_send;
nx_uint32_t b_recv;
nx_uint32_t rtt;
} MyMsg;
I need the time when the source sends to be stored in b_send. As
RadioTimeStamping.transmittedSFD() gives 16-bit time, I convert the 16-bit
time to 32-bit value as provided in CC2420TransmitP.nc. The current time is
obtained by calling Alarm.getNow().
Accoring to the CC2420Transmit.nc, I need to only call
CC2420Transmit.modify() to put the time into the message.
I have:
async event void RadioTimeStamping.transmittedSFD(uint16_t time,
message_t* p_msg) {
atomic {
MyMsg* myMsg = (MyMsg*)(call Packet.getPayload(&mpkt, NULL));
if (&mpkt == p_msg) {
snd_time_32 = time16to32(time, call DataSendAlarm.getNow());
call CC2420Transmit.modify(sizeof(myMsg) - 12, (uint8_t*)
&snd_time_32, 4);
}
}
}
I also need the s_send to be displyed on screen. The BaseStation is modified
for this.
The problem is I always get zero (0) for the s_send.
I've try adding:
myMsg->s_send = snd_time_32;
It doesn't work as the first value is always zero (0). For example:
BaseID SourceID CycleNo BSend SRecv SSend BRecv RTT
0 1 1 xxx xxx
0 xxx xxx
0 1 2 xxx xxx
xxx xxx xxx
I've been working on this for days. Please give me some hints.
Thanks,
Ittipong
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