@ author: Xiaohui Liu
@ created: 1/5/2012
@ description:
|-- Commander: used for test sync of ftsp 
|-- ERCCA: use CCA to decide exclusion region
|-- SignalMap: signal map
|-- SyncRoot: test ftsp sync
|-- TestFtsp: driver of testing ftsp
|-- TestSM: driver of testing signal map
|-- TestiMAC: main driver
|-- cc2420x_test: driver of testing cc2420x after bug fix
|-- iMAC_TDMA: our PRKS protocol
|-- slot_len: calibrate slot length

