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

Ole Bischoff Tue, 27 Jun 2006 06:45:20 -0700

Hi Tran,

i would change the output power with CC1000Control.SetRFPower(uint8_t power) from

CC1000ControlM. You can use this at runtime instead of changing default values.

To validate your changes you can use the CC1000Control.GetRFPower() function.

E.g.: call CC1000Control.SetRFPower(7);

call Leds.set(call CC1000Control.GetRFPower());

-> all LEDs should be on.

OLE

----- Original Message -----

From: Hieu Tran

To: [email protected]

Sent: Tuesday, June 27, 2006 1:44 PM

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

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

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