On Mar 3, 2014, at 14:02, Alexandru Csete oz9aec@gmail.com wrote:
On Mon, Mar 3, 2014 at 10:35 PM, Nick Foster bistromath@gmail.com wrote:
Hi,
gr-osmosdr is great at abstracting the device type, but now I find myself wishing to de-abstract. For instance: HackRF has large DC offset, so I'd like the option to switch in a DC blocking filter when using that source. RTL dongles can't support more than 2.4Msps reliably, so I'd like to be able to cope accordingly at initialization time.
Is there a good way to retrieve, say, a string descriptor telling me which particular source I'm using?
None that I know of, but aren't you the one who decides what device is in use by passing e.g. "hackrf=0" as argument to the constructor?
My own project is unrelated to the original poster's, but I'd also like to see this feature. I'm *not* deciding what device to use -- the user is giving a device string in my application's configuration. I could parse the config string, but then I'm reimplementing parts of gr-osmosdr (note that it can have "a=b" parameters which are not themselves device specifications, and might even come first, or at least that used to be a possibility). Being able to ask gr-osmosdr is good factoring.
Even then, the config string is less specific than might be useful: for example, RTL devices all match "rtl=...", but have different RF characteristics (for example, those with the E4000 chip have a DC offset but R820Ts do not, and they also have different gain and filtering behavior).
This information is available to the underlying driver, obviously as it prints messages like "Using device #0 Realtek RTL2838UHIDIR SN: 1E" and "Found Elonics E4000 tuner"; I'd just like to have that amount of detail exposed. (The first part but not the second is available if you are using osmosdr.device_find().)