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Ioannis Makris makrisj at gmail.comSome more info: I have added zero-copy buffers (1000) as advised by libusb. While on USB3 odroidxu no error occurs, on usb2 I get the following error: libusb: error [op_dev_mem_alloc] alloc dev mem failed errno 19 C error #19 means "no such device" google advises. What could it be? On Sat, 29 Dec 2018 at 07:07, Ioannis Makris <makrisj at gmail.com> wrote: > Hello and thanks for the amazing piece of software. > Despite having managed to do much stuff with it under x64 linux, I failed > miserably to make it work under ARM architecture. > To be more specific, I tried the Odroid-XU usb3.0 capable board and the > Odroid-C1 Usb2.0 board to no avail. > Odroid XU kernel: 3.4.y Odroid-C1 kernel: 3.10.107 > > I used all reasonable ranges of sampling rates and here are the results: > Program seems to run normally. No error codes and.. no buffer underruns at > all. In my i3 laptop I get some buffer underruns but to arm I have never > spotted such a message no matter what the sampling rate is. > > When the sampling rate is a fraction of what fl2k_test reports as maximum, > I see the sampling rate spike on my spectrum analyzer (Advantest TR4132). > But when I opt for fl2k_fm, I see no response whatsoever other than the > enabling of the DAC visible as an increase of a few dB's of noise and a > hint (3dB C/N) at the sampling frequency. > > I tried the binary repositories of libusb for my distribution, and I even > compiled locally libusb from source - nothing changed. > > What could be making such a mess? I have spent over 3 days on efforts to > no avail. I just want to explore upconversion possibilities but I need to > encapsulate both the host and the FL2000 into a shield in order to get > meaningful experimental results. > > Please help if you can > Thanks > Ioannis (John) Makris > SV9OFO > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20181229/54aeedc7/attachment.htm>