Thankyou Greg for your help I have actually programmed the mote such that it reads its own transmitter power level setting using getpower() (before sending the packet) and embeds the value in the packet body and sends the value with the packet. The receiver estimates the RSSI and compares it with the transmitter's setting (extracted from packet body) and evaluates the required power level.
Do getPower() and setPower() not estimate and vary the transmitter power level (respectively) actually? Then how do I vary the power level? Even setPower() didn't work and I get the same values. - Sreevalli ----- Original Message ---- From: Greg Hackmann <[EMAIL PROTECTED]> To: tinyos-help@millennium.berkeley.edu Sent: Thursday, February 7, 2008 10:31:42 PM Subject: Re: [Tinyos-help] Varying transmitter power level sstl vls wrote: > From CC2420 Chipcon data sheets, I learnt that the PA_LEVEL (getPower) > can be any of 3, 7, 11, 15, 19, 23, 27, 31 (CC2420Packet interface says > it can be between 0 and 32.) I assume they are Hexadecimal values.. These are actually decimal values, not hex. > The problem is when I tested it on actual motes, I get a range of values > for getPower : 00 or 1f to 23 or d0 to df > > The values d0 to df are incorrect (and I get them very often ). Can > someone please tell me why this is happening. Is something wrong? The getPower() and setPower() commands manipulate the TinyOS packet metadata, which does not get transmitted across the radio. If you try to read this value on a packet received from another mote, you'll just get uninitialized data. If you want motes to know the PA_LEVEL setting used for the packets that they receive, then you'll need to store that information in the packet's body. Greg Hackmann _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help Send instant messages to your online friends http://uk.messenger.yahoo.com
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