Fwd: [Tinyos-help] Help me with power range and signal strength!
Aditya Bhave
adityay.bhave at gmail.com
Wed Jun 28 22:26:31 PDT 2006
---------- Forwarded message ----------
From: Aditya Bhave <adityay.bhave at gmail.com>
Date: Jun 29, 2006 12:42 AM
Subject: Re: [Tinyos-help] Help me with power range and signal strength!
To: bhushan bhatt <bhattnbikes at yahoo.co.in>
You need to modify the CC1000Control.h file in tos/system/platforms/mica2.
Im assuming youre motes freq is 914 Mhz.
In that case there is a 2D array called CC1K_Params.Look for the PA_POW
variable under the 914 Mhz range (there is a seperate row for each type of
freq). Look in row 1. It is presently
// PA_POW 0x0b
((0x8<<CC1K_PA_HIGHPOWER) | (0x0<<CC1K_PA_LOWPOWER)),
//0xff
Change the above to
// PA_POW 0x0b
// ((0x8<<CC1K_PA_HIGHPOWER) | (0x0<<CC1K_PA_LOWPOWER)),
0x00
You can see that I have changed PA_POW to the value 0x00 FROM 0xff
(default). The 0x0b (decimal number 11) is not a value...it indicates the
position of the element within row 1 of the CC1K_Params array.
By giving diff values to PA_POW from 00 to ff, you can change the range.
Let me know if it works.
If you are using a diff freq mote, change the PA_POW variable corresponding
to that freq
On 6/28/06, bhushan bhatt <bhattnbikes at yahoo.co.in> wrote:
>
> I have the same problem and tried to control the power by changing CC2420
> Radio file for tmote but i still cant get the desired range. I still get
> range more than 30 feet. Does someone know and have reduced the range for
> tmotes ??
>
> Bhushan
>
>
> *Aditya Bhave <adityay.bhave at gmail.com>* wrote:
>
> 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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--
regards,
Aditya Bhave
--
regards,
Aditya Bhave
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