On Fri, June 29, 2007 11:43 am, Bernardo Avila Pires said:
> Wasn't the value in msg->strenght some untransformed one? I remember
> having read that a function should be applied to it in order to obtain
> RSSI.
Only if you want decibels or some other unit. The number given is the
internal measurement scale, plenty useful for direct comparison.
> 2007/6/29, Benjamin Madore <[EMAIL PROTECTED]>:
>>
>> msg->strength is uint16_t
>> You're only getting half the number.
>>
>> Besides,
>> uint16_t * stren = (uint16_t *) msg->strength;
>> RSSI = stren[0];
>> should be easier to read. I think there is an even more elegant way to
>> state
>> this, but I don't care enough to find it. Avoid doing multiple things on
>> one
>> line until your sure all your bugs are gone. (I.E. Never do multiple
>> things
>> on one line.) Let the compiler optimize.
>>
>> Your RSSI should be between 400 and 0. It is interpreted as a negative
>> number, with 400 being quiet, and 0 being very loud.
>>
>> You can also wire to ADC.ADC[TOS_ADC_CC_RSSI_PORT] and call
>> "ADC.getData();"
>> which provides the event "ADC.dataReady(uint16_t data);" like you said.
>>
>> dataReady is singled every time anyone calls getData. The radio stack does
>> this a lot. You have to filter out your calls. I might suggest a lock.
>>
>> When you call getData, set a boolean to true, and when you have read one
>> value in dataReady, set it to false.
>>
>> -Ben
>>
>> On Fri, June 29, 2007 10:21 am, CASTEL Myriam said:
>> > Hello,
>> >
>> > I'm trying to obtain the RSSI value with Mica2 motes.
>> > -I programmed a component which stores the strength of a TOSMsg
>> received:
>> > RSSI=*((uint8_t *)recv_packet->strength);
>> > But this doesn't give reasonnable results. I think this method is only
>> > for the micaz? Isn't it?
>> >
>> > - In the documentation, I saw that the RSSI was given by the channel 0
>> > in mica2.
>> > I tried to sample channel 0 with in configuration file: MyApp.ADC->
>> > ADCC.ADC[0];
>> > in module file: event TOS_MsgPtr ReceiveMsg.receive(TOS_MsgPtr
>> > recv_packet){
>> > call ADC.getData();
>> > return recv_packet;
>> > }
>> > async event result_t ADC.dataReady(uint16_t data) {
>> > atomic pack->xData.datap1.value = data;
>> > post sendMsg();
>> > return SUCCESS;
>> > }
>> > but the problem is that the mote execute ADC.dataReady even if getData
>> > wasn't called. Maybe I have forgotten some elements as:
>> > call ADC.Control.bindPort(TOS_ADC_CC_RSSI_PORT,TOS_ACTUAL_CC_RSSI_PORT)
>> > or other things.
>> >
>> > Can you help me to obtain RSSI value (with channel 0 or other)? If you
>> > have the code to compute RSSI, can you send it to me?
>> >
>> > I'm sorry for this question but I'm new and I don't find the answers in
>> > the documentation provided by Crossbow.
>> >
>> > Thanks
>> >
>>
>>
>>
>> --
>> The difference between the right word and the almost right word is really
>> a
>> large matter- it's the difference between a lightning bug and the
>> lightning.
>> -Twain
>>
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>
>
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The difference between the right word and the almost right word is really a
large matter- it's the difference between a lightning bug and the lightning.
-Twain
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