Hi Matteo Dany,
You only need to make this. For CC2420 and RF230.
#if defined(PLATFORM_TELOSB) || defined(PLATFORM_TMOTE)
int16_t getRssi(message_t *msg){
int16_t rssi_raw = (int16_t) call CC2420Packet.getRssi(msg);
if (rssi_raw > 0x80)
rssi_raw = rssi_raw - 256 - 45;
else
rssi_raw = rssi_raw - 45;
return (int16_t) rssi_raw;
}
#elif defined(PLATFORM_IRIS)
int16_t getRssi(message_t *msg){
if(call PacketField.isSet(msg))
return (int16_t) call PacketField.get(msg);
else
return 0xFFFF;
}
#else
#error Radio chip not supported! Currently only works for motes with
CC2420 or RF230 radios.
#endif
Best regards,
Miguel Silva
---------- Mensagem reencaminhada ----------
From: Mehmet Akif Antepli <[email protected]>
To: Matteo Dany <[email protected]>
Date: Sun, 16 Aug 2009 02:50:11 -0700
Subject: Re: [Tinyos-help] Help- Rssi and field group id
Yes, that's correct.
On Sun, Aug 16, 2009 at 2:43 AM, Matteo Dany <[email protected]> wrote:
Thanks,
I should understand, I read the rssi from a serial packet with an
program write in C.
I put the rssi in a char and subtract -45.
It's right?
Thanks
2009/8/16 Mehmet Akif Antepli <[email protected]>:
> Hi Matteo,
> You should interpret rssi reading as signed 8 bit value in 2's complement
> form.
> (From Page 64 of 87: CC2420 datasheet)
> "RSSI (0x13) - RSSI and CCA Status and Control Register" part
> On Sun, Aug 16, 2009 at 1:09 AM, Matteo Dany
<[email protected]> wrote:
>>
>> Hi guys,
>>
>> I have a tmote sky and I search to read a Rssi, but I have little
>> problem with convert Rssi .
>> I read correctly the Rssi from radio message and the value appears in
>> a range 0, 255. But how convert the value in dbm?
>> I search in google and I read the CC2420 datasheet, they suggest to
>> subtract -45 to the value found.
>> When I found 255 - 45 = 210 dbm? I read in the datasheet that the
>> range is from 0 to -100 dbm.
>> Where I wrong?
>>
>>
>> Thank you very much
>>
>> Matt
>> _______________________________________________
>> Tinyos-help mailing list
>> [email protected]
>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>
>
>
> --
> Mehmet Akif Antepli
> Grad. Student
> Dept. of EEE
> Middle East Technical University
>
--
Miguel Torres Silva
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