The RF212 radio driver has the following configuration options. Some of 
these are set in the platforms/xxx/chips/rf212/RadioConfig.h header file, 
see the meshbean900 platform for example, others can be set in your Makefile.

RF212_TRX_CTRL_0_VALUE:

This is the value of the TRX_CTRL_0 register which configures the output 
pin currents and the CLKM clock:

RF212_CCA_MODE_VALUE:

This is the default value of the CCA_MODE field in the PHY_CC_CCA register
which is used to configure the default mode of the clear channel assesment

RF212_CCA_THRES_VALUE:

This is the value of the CCA_THRES register that controls the energy levels 
used for clear channel assesment.

RF212_DEF_RFPOWER:

This is the default value of the TX_PWR field of the PHY_TX_PWR register. 
This can be cahanged via the PacketTransmitPower interface provided by the 
RF212ActiveMessageC.

RF212_DEF_CHANNEL:

This is the default value of the CHANNEL field of the PHY_CC_CCA register.
This can be cahanged via the RadioChannel interface provided by the 
RF212ActiveMessageC.

RF212_RSSI_ENERGY:

If you define this, then the content of the RF212_PHY_ED_LEVEL is queried 
instead of the RSSI value for eahc incoming message. This value can be 
obtained with the PacketRSSI interface.