Re: [Freetel-codec2] Codec on STM32

glen english Mon, 19 Sep 2016 02:39:52 -0700

Hi Marat My *simplistic * observations is that these are due to variations in the FPUs/ rounding error/ bias. What codec bit are these variations in ? IE for codec2 1200 : The bit allocation is: Parameter frame 2 frame 4 Total ------------------------------------------------------- Harmonic magnitudes (LSPs) 0 27 27 Energy+Wo 8 8 16 Voicing (10ms update) 2 2 4 Spare 0 1 1 TOTAL 10 38 48 regards

On 19/09/2016 7:12 PM, Marat Galyamov wrote:

Hello, Glen.

In Windows I use CodeBlocks IDE with MinGW compiler, info from readme-file :

=== TDM-GCC Compiler Suite for Windows ===
--- GCC 4.6 & 4.7 Series ---
*** Standard MinGW 32-bit Edition ***

For microcontroler I use IAR IDE (iar.com) with her own compiler.
I experiment with STM32F746-Discovery board.

In CodeBlocks IDE I switched off optimization.

In IAR IDE I have turned on optimization in Mdeium level.
I left settings of a linker by default, but I have increased the sizes of a stack and heap.

STM32F746NG has single precision FPU.

I made a screenshot - compared two output files, version from PC and version from STM32.
All incoincident bytes differ on one value.
Sorry for my english.

Суббота, 17 сентября 2016, 1:57 +03:00 от glen english <[email protected]>:

Hi Merit

you could be looking at the difference in the floating point units
between the processors- the F7 and the F4 have slightly different versions.

What compiler- linker processor flags have you used -?

If you use the F4 processor flags you may almost certainly get a
different / wrong result..

In addition to very subtle differences, some of the F7s have double
precision FPUs instead of single precision FPUs

do you have doubles forced to floats ?

have you a verification method / check in place to ensure you are not
blowing/ overwriting memory somewhere ?

g

On 17/09/2016 6:38 AM, Marat Galyamov wrote:
>
> Hello.
> I try to use the Codec2 on the STM32F746 microcontroller. For a start,
> I took files of the codec and collected the project for the PC in the
> CodeBlocks IDE with the compiler GCC.
>
> Coding and decoding of the raw-file took place successfully, the
> regenerated file has high quality.
>
> Then I collected the project in the IAR IDE (for STM32F746-Discovery
> board) and added
>

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Re: [Freetel-codec2] Codec on STM32

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