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FPU Question


n2msqrp 2021/04/05 11:49

How can I tell if my NanoVNA v2.2 has a FPU?

Thanks Mike N2MS

DiSlord 2021/04/05 08:58

Go to version screen and at bottom see text
Has FPU: yes/no

Vladimir Lebedev 2021/04/05 08:59

On Mon, Apr 5, 2021 at 11:49 PM, n2msqrp wrote:

>
> How can I tell if my NanoVNA v2.2 has a FPU?

>
> Hello Mike!

It's easy --> CONFIG--->VERSION

Has FPU: yes OR Has FPU:no
Vladimir

n2msqrp 2021/04/05 12:10

My V2.2 SAA-2N does not show a FPU. Shall I use use firmware V2 480x320 grid noFPU ?

Mike N2MS

DiSlord 2021/04/05 09:12

You can use noFPU version in all cases (and change it if need later)

n2msqrp 2021/04/05 12:19

Thanks,

Mike N2MS

n2msqrp 2021/04/05 12:39

I loaded the V2 480x320 grid noFPU firmware unto my SAA-2N over Ojisankoubou firmware. The version now shows it has a FRU so I loaded V2 480x320 grip firmware.

I noticed you changed the DPU key to BOOTLOAD,

Thanks for the new firmware. I will be experimenting with this code.

Mike N2MS

Siegfried Jackstien 2021/04/05 17:00

read

on your screenshot it says has fpu : yes

dg9bfc sigi

Am 05.04.2021 um 15:59 schrieb Vladimir Lebedev:

n2msqrp 2021/04/05 14:00

The Ojisankoubou firmware I had on the SAA-2N did not show the FPU state.

Mike N2MS

OwO 2021/04/06 02:07

I tested the fpu and nofpu versions and can not see any difference in
responsiveness or sweep speed, so I suggest all builds should be nofpu
just like the official firmware. None of the DSP code uses floating
point (the accuracy would be worse compared to 32 bit integer math).

OwO 2021/04/06 02:16

It has been impossible for anyone to get GD32F303 with new datecodes for
quite a while now so there is no way to guarantee FPU support, but since
FPU seems to give no improvement in performance I think it should just
be turned off always.

aleks07111971 2021/04/05 12:19

Greetings Gabriel, is there another variation on the bridge setup to increase the dynamic range?

David Eckhardt 2021/04/05 23:16

OK, guys. Forgive an old fossil analog and RF type dealing with all the
'new' acronyms. What is an FPU (Fast Processor Unit, or a few other less
polite phrases)?

Dave - WØLEV

On Mon, Apr 5, 2021 at 3:49 PM n2msqrp <mstangelo@comcast.net> wrote:

> How can I tell if my NanoVNA v2.2 has a FPU?
>
> Thanks Mike N2MS
>
> On 04/04/2021 3:41 PM DiSlord <dislordlive@gmail.com> wrote:
>
>
> FPU unit not critical, in most cases useful speedup only for Time Domain
> (most time device wait measure) it allow reduce fw size
>
> PS i add fw variants for disabled FPU also
>
>
>

--
*Dave - WØLEV*
*Just Let Darwin Work*

Vladimir Lebedev 2021/04/05 16:42

Hello Dave!
FPU = I think, Floating Point Unit or?
Vladimir
dl7pga

aleks07111971 2021/04/05 20:10

FPU (Floating Point Unit) - a unit that performs floating point operations (often said as a comma) or a mathematical coprocessor. FPU helps the main processor to perform mathematical operations on real numbers. At first, it was used as an option, as an additional processor.

David Eckhardt 2021/04/06 03:54

OK. I well remember the days of an additional math co-processor. Thank
you.

Dave - WØLEV

On Tue, Apr 6, 2021 at 3:11 AM <aleks07111971@yandex.ru> wrote:

> FPU (Floating Point Unit) - a unit that performs floating point operations (often said as a comma) or a mathematical coprocessor. FPU helps the main processor to perform mathematical operations on real numbers. At first, it was used as an option, as an additional processor.
>
>
>
>

--
*Dave - WØLEV*
*Just Let Darwin Work*

Erich Kaltenbrunner 2021/04/06 07:02

Flouting Point Unit, a mathematically oriented processor that gives more decimals in the calculations to the cost of speed.


Erich

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