[Discuss-gnuradio] USRP Overrun Problem
Hi all, I am testing an application, which receives data from usrp. The datarate is 2M, and samples_per_symbol is 2, decimation is 16. I am using a PC, with Ubuntu 8.10, intel pentium 4 cpu 2.40G, and 768M Memory. But the shell displays uOuOuO when running. I know it means usrp overrun. I am not opening any large programs except internet brower. Because i cannot change the decimation and sample_per_symbol, What method can i use to avoid usrp overrun? Any help in this regard would be highly appreciated, and thank you for your help! Regards, Lizhao ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Some Questions about UCLA_ZIGBEE_PHY project codes
Hi all, I am a newbie at GNU Radio, and I am in the beginning of my bachelor's thesis, which is to connect GNU Radio with Telosb sensor node. I know there is a project named UCLA_ZIGBEE_PHY to connect GNU Radio with Zigbee, so i try to use this code to do some implementation. Currently i use XCVR2450 Rx daugtherbroad in USRP. I installed a simple application in telosb, and when i type the command: python cc2420_rxtest.py -c 248000(Telosb uses channel 26, and it's central frequency is 2.48G). I get the following result: cordic_freq = 2.48G data_rate = 2M samples_per_symbol = 2 usrp_decim = 16 fs = 4M Using RX d'board A: XCVR2450 Rx >>> gr_fir_fff: using SSE 802_15_4_pkt: waiting for packet There's nothing more to display. So i was wondering whether GNU Radio can communicate with Telosb? I check some file in UCLA_ZIGBEE_PHY project, and in ucla_ieee802_15_4_packet_sink.h: static const int MSG_LEN_POS = 8+1; // 8 byte sos header, 1 byte AM type static const int MAX_PKT_LEN= 128 - MSG_LEN_POS - 1; // remove header and CRC I don't think this definiton is compatible with ieee802.15.4 frame format, whose FCF is 2Bytes. Maybe the different frame format definition is the problem. I am not sure. Is there any guideline available to get GNU Radio communicated with Telosb? Any help is appreciated! Thank you very much! Regards, You Lizhao ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
