Never mind. It looks like I should build "hackrf_usb.bin". That looks the
correct size.
--Patrick
From: wp...@hotmail.com
To: domini...@gmail.com
Date: Wed, 13 Jul 2016 19:38:29 -0700
Subject: Re: [Hackrf-dev] How to do retunes in firmware ?
CC: hackrf-dev@greatscottgadgets.com
I have built a version of the firmware following the instructions in the
hackrf/firmware/README file. The build produces the following files:
hackrf_usb.elf -> 591408 bytes
hackrf_usb_m0.bin -> 396 bytes
hackrf_usb_m0.elf -> 93992 bytes
Compared to the downloaded firmware hackrf_one_usb_rom_to_ram.bin which is of
size 20452 bytes the above .bin seems too small.
The wiki page says: "When writing a firmware image to SPI flash, be sure to
select firmware that is compiled with the "rom_to_ram" option"
How do I build with the "rom_to_ram" option ?
Thanks,
--Patrick
From: domini...@gmail.com
Date: Wed, 13 Jul 2016 12:56:02 +0100
Subject: Re: [Hackrf-dev] How to do retunes in firmware ?
To: wp...@hotmail.com
CC: hackrf-dev@greatscottgadgets.com
On 13 July 2016 at 02:47, Patrick Sathyanathan <wp...@hotmail.com> wrote:
>
> Thanks for the info. I have been looking at the firmware code in
> .../hackrf/firmware/hackrf_usb and I see there is a "main" function in
> hackrf_usb.c. I'm not sure I understand the control-flow. After doing some
> initialization there seems to be a loop transferring buffers 0/1. Is this
> loop where I should insert my periodic retuning code ?
Yes, if you want something to happen after N buffers, then you can count them
there and call the code at that point. Alternatively you could set a timer,
but that wouldn't be synced to the number of buffers.
>
> Is there a document that outlines the design of the firmware ? Something that
> outlines the major modules and that could point me to where I need to make my
> modifications ?
As far as I know there isn't any documentation on how the firmware is put
together. You seem to be doing a good job of working it out from the code, but
if you have any questions, IRC or this mailing list are good places to ask.
Thanks,
Dominic
> ________________________________
> From: domini...@gmail.com
> Date: Sat, 9 Jul 2016 14:05:47 +0100
> Subject: Re: [Hackrf-dev] How to do retunes in firmware ?
> To: wp...@hotmail.com
> CC: hackrf-dev@greatscottgadgets.com
>
>
> On 8 July 2016 at 03:02, Patrick Sathyanathan <wp...@hotmail.com> wrote:
> >
> > I am trying to use the HackRF-One for fast scanning somewhat like
> > osmocom_spectrum_sense but using the hackRF library directly. I want to
> > reduce retune time as much as possible. A recent thread on this list
> > mentioned that firmware tuning is the fastest. How do I implement periodic
> > (at fixed intervals) retuning in firmware ? Can I also make my PC
> > application aware of the current frequency at any time with this ?
>
> The firmware doesn't currently support retuning, so the feature would need to
> be added. You would need to determine a way for the host application to know
> what the frequency is, I would suggest either:
> 1) putting the currently tuned frequency at the start of the buffer to be
> sent back to the host
> or
> 2) configuring a fixed number of buffers to return to the host between
> retuning event
>
> The first means changing the buffer sizes and any complexities involved with
> that, the second means synchonisation issues if a transfer is dropped for any
> reason
>
> > Is there any sample code I can look at ?
>
> I believe that Mike Walters is currently working on a project with very
> similar goals. I don't know if his code is available yet, but I would expect
> it to appear on GitHub when it is.
>
> Dominic
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