On May 18, 2007, at 8:48 PM, Shuo Xiao wrote:
Hi Phil,
The default transmission power CC2420_DEF_RFPOWER is defined in the
CC2420.h. The details is as follows:
#ifndef CC2420_DEF_RFPOWER
#define CC2420_DEF_RFPOWER 31
#endif
And the verification on tx power is in the file CC2420TransmitP.nc.
void loadTXFIFO() {
cc2420_header_t* header = call CC2420Packet.getHeader( m_msg );
uint8_t tx_power = (call CC2420Packet.getMetadata( m_msg ))-
>tx_power;
if ( !tx_power ) {
// If our packet's tx_power wasn't configured to anything but 0,
// send it using the default RF power. This assumes the
// packet's metadata is all set to 0's on boot.
tx_power = CC2420_DEF_RFPOWER;
}
<snip>
But why did you say that 0 means default power level? I don't quite
understand it. And how to use commands CC2420Packet.getPower and
CC2420Packet.setPower to get and set the tx power respectively in
the application? Thanks a lot.
The above lines of code, starting with "if ( !tx_power)".
Phil
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