[Hackrf-dev] HackRF settling time

[Ibrahim Basaran]

Thank you Mike and Quentin, 

We were already planning to do the sweep in firmware since we have guessed the USB interface overhead. 
As a simple test, I'll try Quentin's suggestion, it will give us a better idea for our design, but we'll eventually make it in the firmware for performance. 
I'll post the results for reference. 

İbrahim BAŞARAN 

----- Orijinal Mesaj -----

Kimden: "Michael Ossmann" <mike at ossmann.com> 
Kime: "Quentin Smith" <quentin at mit.edu> 
Kk: "Ibrahim Basaran" <ibrahim.basaran at tubitak.gov.tr>, hackrf-dev at greatscottgadgets.com 
Gönderilenler: 10 Ekim Cuma 2014 5:54:15 
Konu: Re: [Hackrf-dev] HackRF settling time 

On Thu, Oct 09, 2014 at 11:25:12AM -0400, Quentin Smith wrote: 
> 
> You should write an app (maybe just a simple modification of 
> hackrf_transfer) that opens the device once and then tunes different 
> frequencies at fixed intervals, and I bet you'll find a much shorter 
> settling time on all subsequent tunings. 

Ideally you would do this in firmware. The thing that takes the most 
time when tuning from the host is the USB interface. In firmware it 
should be possible to tune in well under 1 ms. With some work on 
optimization, I think it could be faster than 200 us. 

Mike 

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