Hi all,
I have a little problem here. I want to read the header (specifically
the AM_ID of the packet).
In my BaseStation program (which pretty much the standard one), I am
doing the following:
message_t* receive( message_t *msg, void *payload, uint8_t len )
{
message_t *ret = msg;
atomic
{
if( !uartFull )
{
// OK the queue is not full, so extract the data
cc2420_header_t* header = call
CC2420PacketBody.getHeader( msg );
switch( header->type )
{
case 6:
{
report_msg *r_msg = (report_msg*) payload;
r_msg->base_id = TOS_NODE_ID;
call Leds.led0Toggle();
break;
}
case 7:
{
loc_msg *l_msg = (loc_msg*) payload;
// overwrite the base_id field
l_msg->base_id = TOS_NODE_ID;
// get the RSSI value
l_msg->rssi = call CC2420Packet.getRssi( msg );
l_msg->lqi = call CC2420Packet.getLqi( msg );
call Leds.led1Toggle();
break;
}
default:
break;
}
ret = uartQueue[uartIn];
uartQueue[uartIn] = msg;
uartIn = (uartIn + 1) % UART_QUEUE_LEN;
// check, if the queue is full now
if( uartIn == uartOut )
uartFull = TRUE;
if( !uartBusy )
{
// OK message can be send to the serial port
post uartSendTask();
uartBusy = TRUE;
}
}
else dropBlink(); // queue was full, so discard packet
}
return ret;
}
The packet comes from a TMote Sky with a CC2420 radio interface. Based
on this, I am looking up the CC2420 packet header.
In case it's am_id 6, I am just overwriting one packet field. In case
it's 7 I am overwriting this field as well plus the RSS and LQI value.
Unfortunately, when I receive packets the base_id field is never
overwritten.
Is there anything wrong in the logic/programming?
Thanks for any hint :)
Cheers,
-Martin
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