Hi Maxime,
I haven't noted the exact timing but full duplex encode/decode was
possible on a 168MHz STM32F4 Discovery board. The decoder took a little
longer than the encoder. So 320 samples encoded/decoded in roughly 20ms
each.
So even with a 30% reduction in clock speed, you should be doing a
little better.
In the SM1000 (and other digital radio applications) we often do half
duplex, with the modem taking up the other half.
Cheers,
David
On 17/06/16 02:42, Maxime Guyon wrote:
> Hello,
>
> I've tested the Codec2 on a TIVA TM4C129 which is a TexasInstrument
> CORTEX-M4F cadenced at 120MHz.
> I checkedout the 0.5 TAG version on SVN and take the configuration of
> your STM32 (running codec at CODEC2_MODE_1300)
> It looks like that FPU is enabled on my device.
> I've tested with maximum optimization O3 and also O4 and optimize speed.
>
> Here are my profilling code which only add IO toggle on "c2demo.c" file
> example available in src folder
> The file input is "hts1a.wav"
> I only added IO toggling for capturing time encoding and decoding:
>
> / while(fread(buf, sizeof(short), nsam, fin) == (size_t)nsam) {/
>
> /
> //GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_4, GPIO_PIN_4);
> //codec2_encode(codec2, bits, buf);
> //GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_4, 0);/
>
> /
> //GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_5, GPIO_PIN_5);
> //codec2_decode(codec2, buf, bits);
> //GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_5, 0);/
>
> /
> //fwrite(buf, sizeof(short), nsam, fout);
> //}/
>
>
> On my scope I've read the time for IO to toggle and here are my result:
>
> -Encoding time is between *25ms *and*42ms*
> -Decoding time is between *39ms *and *56ms*
> *
> *
> Example seem to read buffer of 320 sample, so if I take the worst case
> for each functions:
>
> -Encoding : 320 sample are encoded in 42ms so in 1second I can
> encode 7619samples.
> -Decoding: 320 sample are decoded in 56ms so in 1second I can
> encode 5714samples.
>
> So as you can see I'm not able to do realtime encoding and decoding
> since I need to be able to encode at least 8000sample for do real time
> things (8KHz sampling rate)
>
> Do you have any suggestion/hint about this?
> What is your encoding and decoding time on your STM32F4 board running at
> 168MHz?
>
>
> Regards,
>
> Max
>
>
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