[Tinyos-help] Help me with power range and signal strength!

[Aditya Bhave]

Many users (including me) have had no success using the CC1000Control
interface and the setRFPower commands.

The way I did it was to edit the CC1000Control.h file in
/tos/system/platforms/mica2. Ive forgotten the excat location now but there
is a 2-D array called PARAM..something somewhere. In the xxxMhz array (xxx
is the radio freq of the motes u are using..there is a seperate array for
each type of freq) change the value of the PA_POW variable. (this is a
register in the CHIPCON chip that can be used to adjust the transmitter
power). By default it is 0xff on MICA2 motes. When i changed it to 0x00 i
got a range of about 4-6 feet in an indoor lab environment.

On 6/28/06, Rahul Sawant <sawantrahul at gmail.com> wrote:
>
> Hi
>
> Use the formula on pg 28 of this document.
>
> http://www.xbow.com/Support/Support_pdf_files/MPR-MIB_Series_Users_Manual.pdf
>
> also u have declared data in MyMsg to be an array of size 18 ie it runs
> from 0 to 17 and u r using
>  data[18] is it right just check that.
>
> Rahul
>
>
> On 6/27/06, Hieu Tran <ctkdh at yahoo.com> wrote:
>
> >  Hi all!
> I searched in the archieves and found some of the topics that disscuss
> about power range however I still have problem with it.
>
> in the CC1000ControlM at the line:
>
>  // Set default parameter values
>     // POWER 0dbm
>     gCurrentParameters[0xb] = ((8 << CC1K_PA_HIGHPOWER) | (0 <<
> CC1K_PA_LOWPOWER));
>     call HPLChipcon.write(CC1K_PA_POW, gCurrentParameters[0xb]);
>
> I guess I can make a change to power range here so I make change :
>
>     gCurrentParameters[0xb] = 1; //I want to change to the minimum power
> range
>     call HPLChipcon.write(CC1K_PA_POW, gCurrentParameters[0xb]);
>
> After that I recompile my program and run it. However It seems that my
> change does not go in to effect (the range is still large).
> Can you tell me the correct way to make the change to the power range?
>
> I have one more question about signal strength.
>
> I made the change at the TOS_Base, I try to read the signal strength from
> TOS_Msg
>
> event TOS_MsgPtr RadioReceive.receive(TOS_MsgPtr Msg) {
> cmd= (struct MyMsg *)Msg->data;
> temp1 = (int8_t) (((Msg->strength)>>8) & 0xF);//take 8 MSB
> cmd->data[17] = temp1;//put in to packet at data[17]
> temp2 = (int8_t) ((8<<(Msg->strength)) & 0xF);//take 8 LSB
> cmd->data[18] = temp2;//put in ton packet at data[18]
> ..........................................
>
>
> Here is MyMsg structure:
> typedef struct MyMsg {
>     uint16_t seqno;
>     int8_t action;
>     uint16_t source;
>     uint8_t hop_count;
>     uint16_t destaddr;
>     int8_t data[18];
> } MyMsg;
>
>
> After that, I use Listen program to read signal strength value, however
> all the times these values are always 0 or 1 (convert to decimal number).
> Can anyone tell me is this a correct way to receive signal strength? If
> correct, how can convert this value to dBm?
>
> many thanks!
>  Tran!
>
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-- 
regards,
Aditya Bhave
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