hi,guys.
I am trying to access the hardware noise floor with tinyos-2.x
I am confused about the code in Module "CC2420ControlP.nc"
event void RssiResource.granted() {
uint16_t data;
call CSN.clr();
call RSSI.read(&data);
call CSN.set();
call RssiResource.release();
* data += 0x7f;*
data &= 0x00ff;
signal ReadRssi.readDone(SUCCESS, data);
}
Here, i don't know why the var data should be added by 0x7F
And, in Module "CC2420PacketC.nc"
async command int8_t CC2420Packet.getRssi( message_t* p_msg ) {
return (call CC2420PacketBody.getMetadata( p_msg ))->rssi;
}
Here, it just read the rssi value in metadata, and do not plus 0x7f
I've been searching for the answer for a couple of hours. But without luck
yet..
Thank you for all your help!
Regard,
Nathan
3.23.2010
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