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From: | Feng Andrew Ge |
Subject: | [Discuss-gnuradio] A couple of questions related to UHD |
Date: | Thu, 17 Feb 2011 16:57:21 -0500 |
User-agent: | Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.13) Gecko/20101208 Thunderbird/3.1.7 |
(1) When transmitting UHD packets (with USRP2 + WBX), after each transmission, there is either one or a few "U" printed out. What does "U" mean? Is it used in the update packet from USRP2 to the host?
(2) In uhd:usrp:single_usrp, there is a function "read_rssi", is this function enabled? If so, does it mean that we can read RSSI value directly from USRP2? I suppose that this function is implemented on the FPGA since there exits a rssi.v function in the uhd library.
(3) In uhd:usrp:single_usrp, it seems that "get_rx_rate" is for setting sampling rate, but then what is "get_rx_bandwidth" for?
(4) In flow control, how to specify "ups_per_fifo", just like device_address["ups_per_fifo"] = "xx"? Also, what are the FIFOs on USRP2 and what are their default sizes?
(5) For "concurrency_hint", it says "the number of threads to run the IO service", does it mean the total number of threads associated with the UDP socket for each USRP_SINK or USRP_SOURCE, or something else?
(6) Do control messages generated by functions like get/set_tx_gain and get/set_tx-freq have to wait on the same UDP buffers which are also used for exchanging data samples between GNU Radio and USRP?
Andrew
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