Hi all,
thank you for your advise. I looked through the Makefile and struggled at :
LIBS = libstm32f4.a -lg -lnosys -lm
I could not find anything about these options . What are they doing?
I tried to optimize the Code for arm-Cpus with the usage of arm_math.h instead
of math.h. Alone the replacement of the sine and cosine functions could achieve
a speedup of 10%. Other optimizations are not so easy., but the usage of e.g.
loop unrolled vector multiplications should provide another nice speed up.
Another big optimization potential is in the kis_fft_functions. I saw that the
other open-source audio-codec Opus provide special compiler-options for
arm-cpus for that functions. Do you plan to perform further optimizations ?
Thanks in advance,
Stefan
----- Ursprüngliche Mail -----
Von: "Andy Wood" <[email protected]>
An: "[email protected]"
<[email protected]>
Gesendet: Montag, 9. März 2015 14:49:28 GMT +01:00
Amsterdam/Berlin/Bern/Rom/Stockholm/Wien
Betreff: Re: [Freetel-codec2] Codec 2 on ARM M4
Make sure you have optimisation set to -Ofast or -O3 and benchmark it to check
what is the fastest in your particular compiler.
See https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
Andy.
> Date: Mon, 9 Mar 2015 20:38:25 +1030
> From: [email protected]
> To: [email protected]
> Subject: Re: [Freetel-codec2] Codec 2 on ARM M4
>
> Hi Stefan,
>
> I'm surprised that a 120MHz CPU is struggling, as we only used a
> fraction (maybe 50%) of the 168MHz ST32F4.
>
> Nothing special for the STM32F4, I re-organised some C code, used single
> prec trig functions (cosf, sinf etc) and that is now all part of the
> regular Codec 2 code in the src directory that runs on all platforms.
> Didn't even end up using the STM fft library as in my unit tests it was
> slower than kiss fft (although I may have screwed up there).
>
> You can see the gcc options in codec2-dev/stm32/Makefile.
>
> Sue you have hard float enabled for your uC?
>
> - David
>
> On 09/03/15 18:26, Stefan Ereth wrote:
> > Hi all,
> >
> > I'm trying to port codec2 to a Freescale microcontroller. This board has
> > 120 MHz CPU and a floating point unit. At the moment I would need 110% CPU
> > speed for decoding codec2 in real time. In the YouTube Video "Embedding
> > Codec 2: open source speech coding on a low-cost microcontroller" David
> > Rowe presented an implementation on a STM32F4 with encoding and decoding in
> > real-time. He mentioned that some optimizations are needed for this
> > processing speed. I couldn't find something like that in the stm32 folder,
> > but some switches over defines for calculations in time- or
> > frequency-domain in the processing chain. Also the filter length could be
> > reduced for low perfomance cpus.
> >
> > Are there optimised settings for microcontrollers?
> > Do you use arm_math.h for arm specific sin/cos/fft functions?
> >
> >
> > Thanks in advance,
> > Stefan
> >
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