fl2k on Odroid C1 & Odroid-XU
makrisj at gmail.com
Sat Dec 29 05:20:28 UTC 2018
Some 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
> Ioannis (John) Makris
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