Hi, I want to make our usrp run with UCLA_ZigBee_Phy communicate with sensor node which equipped with CC2420 RF chip. But I failed, the following experiments are what I have done: I used the default SHR and SFD values with four bytes 0x00 and one A7 in Physical Layer, and modified the Frame Control fields and Addressing fieldsof MAC frame in order to be in accordance with our sensor node as this: Frame Control Fields: B0 ---- B2 : Frame Type = 100 B3 : SecurityEnabled = 0 B4 : Frame Pending = 0 B5 : Ack Request = 0 B6 : Intra PAN = 1 B7 --- B9 : Reserved = 000 B10 --- B11 : Destination Addressing Mode = 01 B12 --- B13 : Reserved = 00 B14 --- B15 : Source Addressing Mode = 01 so the fuction make_FCF in /ucla_blks/ieee802_15_4_pkt.py returns \0x41\0x88. The Addressing fields is changed with: addressInfo = struct.pack("HHHH",0x0010,0x0010,0x0010,0x0000) ,so the source and destination node are in the same PAN. 1. Two usrp run with UCLA_ZigBee_Phy program on two separate machines can communicate successfully.( One send the other receive,or vice versa.),The printed message on screen include MHR + MAC payload + MFR is : payload: ['0x41', '0x88', '0xe5', '0x10', '0x0', '0x10', '0x0', '0x10', '0x0', '0x0', '0x0', '0x80', '0x80', '0xde', '0xb7'] 2. One sensor send, and the usrp can receive successfully. ,The printed message on screen include MHR + MAC payload + MFR is : payload: ['0x41', '0x88', '0x1b', '0x1', '0x0', '0x1', '0x0', '0x1', '0x0', '0x0', '0x0', '0x0', '0x0', '0x3f', '0x58'] 3. One usrp send, and the sensor node receive failed !!! The three experiments work on the same central frequency 2.405G, I tried to change the following parameters in cc2420_txtest.py, but that seems meaningless. dac_rate = self.u.dac_rate(); self._data_rate = 2000000 self._spb = 2 self._interp = int(128e6 / self._spb / self._data_rate) self.fs = 128e6 / self._interp So anyone would be kind enough to tell me the potential reason ? Any suggestions will be appreciated. Thanks.
on 2009-04-28 17:02