hi josh, i tried the example tx_waveforms.cpp using the following arguments --freq 1000000 --rate 8000000 --gain 20 --wave-type "SQUARE" --wave-freq 200000 --ampl 0.3 --spb 10000 but there is an under run error so is there any suggested answer please
sorry for asking too much questions but i am really stuck thanks , osama riad > Date: Mon, 12 Dec 2011 08:07:57 -0800 > From: j...@ettus.com > To: osama_valencia...@hotmail.com; usrp-us...@lists.ettus.com > Subject: Re: [Discuss-gnuradio] USRP1 questions > > > > On 12/12/2011 01:52 AM, osama mohamed wrote: > > > > hi all, > > i am using USRP1 with basic tx and rx boards and i have been suffering > > some problems recently so i hope you could answer the following > > questions(even if not all of them) > > > > Q1: > > when i run the examples tx_timed_samples.cpp and tx_burst.cpp i don't > > get any output i tried various sampling rates and amplitudes but they > > still didn't produce any output if there is a certain configuration > > (i.e. sampling rate and amplitude) that works kindly inform me also i > > would like to know the output i am expected to see? > > > > > > Those are examples apps to demonstrate API usage. See tx waveforms or tx > samples from file for examples that transmit. > > > Q2: i would like to tx a signal by setting the NCO frequency on the > > codec chip through the class codec_ctrl instead of using the PLL, is > > this doable or not and ,if yes should i use the class multi_usrp or i > > have to jump to the lower level class usrp1_impl? > > > > > If you have basic TX and usrp1, the only frequency translation occurs in > the codec. There is no PLL. > > > Q3: can i use the low level class usrp1_impl to do the same > > functions of the examples tx_timed_samples.cpp and tx_burst.cpp > > through setting the frequency tuning word of the codec through the class > > codec_ctrl ? > > > > > > The implementation is not exposed. You will need some "creative" coding > if you want to access the internal objects. > > What do you think is missing in the "multi_usrp" wrapper? > > > Q4: as i understand from the constructor of the class usrp1_impl the > > sampling rates of the tx path are automatically detected and assigned > > through this constructor is this true or i have to set them through a > > certian function? > > > > > > You should manually set the desired sample rate through the API. > See > http://files.ettus.com/uhd_docs/doxygen/html/classuhd_1_1usrp_1_1multi__usrp.html#ab8bc17744d3ee94b7c5cdcb75457bd6b > > -Josh
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