Sorry for the blank message. What I wanted to ask is what the
application being intended here. In the past, I have found it
reasonable to use two motes in a situation that requires RSSI
measurement and packet reception.
Thanks,
Tal
> Thanks,
> Tal
>
>> Hi,
>>
>>
>>
>> You could try something like the following in CC2420ReceiveP:
>>
>>
>>
>> uint16_t RSSI_Values[SomeNumberDeterminedByLengthofPkt];
>>
>>
>>
>> async command void CC2420Receive.sfd( uint16_t time ) {
>>
>> if ( call SpiResource.immediateRequest() == SUCCESS )
>>
>> sample_RSSI();
>>
>> ...
>>
>> }
>>
>>
>>
>> void sample_RSSI(){
>>
>> call CSN.clr();
>>
>> for (count=0; count < SomeNumberDeterminedByLengthofPkt; count++)
>>
>> call RSSI.read(RSSI_Values + count);
>>
>> call CSN.set();
>>
>> call SpiResource.release();
>>
>> }
>>
>>
>>
>> However this may cause other issues I'm not aware of. The way I
>> understand
>> this is that the MCU will sample the RSSI register over the bus while
>> the
>> CC2420 pulls in the data. When the data is fully in the RXFIFO it can
>> be
>> read out and you have both the packet and multiple RSSI samples. Of
>> course
>> you'd probably only get a small number of RSSI sample over a 40 byte
>> packet.
>> I'd be interested to hear your opinion on this Phil.
>>
>>
>>
>> Regards,
>>
>> Damien.
>>
>>
>>
>>
>>
>>
>> On Jan 24, 2008, at 2:58 PM, Octav Chipara wrote:
>>
>> Hi,
>>
>> I'm trying to write an application that samples the RSSI register at
>> high rates and also receives packets. However, it looks like most of
>> the time the you cannot access the RSSI register due to having a
>> single resource manager for the entire radio. From the cc2420 manual,
>> my understanding is that you could both read the RSSI register and
>> receive a packet at the same time. Is this correct? If so, was anyone
>> able to do this. I guess you would have to multiple resource managers
>> for the radio?!
>>
>>
>>
>> Software reads packets and the value of the RSSI register using a bus
>> connected to the radio. So you can't read both a packet and the RSSI
>> register at the same time. Therefore, you can't read the RSSI register
>> at
>> a
>> rate faster than that determined by the time it takes to read a packet
>> out.
>>
>>
>>
>> You can always just read the RSSI register continuously and let the
>> radio
>> hardware drop packets... Note that if it's issuing hardware
>> acknowledgements, then you can't read the RSSI register while it is in
>> TX
>> mode (the valid bit in the reading will be low).
>>
>>
>> Phil
>>
>>
>>
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>
>
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